End Of Life Research Articles

Teaching Aid Regarding the Application of Advanced Organic Petrography in Recycling End-of-Life Lithium-Ion Batteries

This teaching aid aims to illustrate a range of the most common materials in end-of-life (EoL) lithium-ion batteries (LIBs) to demonstrate the usefulness of advanced organic petrography in the characterization of EoL LIB materials and to assess the efficiency of LIB recycling processes from the pre-processing stage up to the impurities of the metallurgical processes. Additionally, it may be useful for students, petrographers, and professionals in battery development and recycling.

Exploring patient awareness of palliative care - optimal timing and preferred approaches.

To explore patients' awareness levels of palliative care (PC) and how this awareness shapes their preferences regarding the timing and approach for discussing it. The study, conducted at a prominent institution specializing in oncology care, enrolled women aged 18-75 years who had been diagnosed with breast cancer. Patients completed guiding questions: Do you know what PC is?, When is the most appropriate time and the most appropriate way to discuss PC?. The interviews were conducted exclusively via video call and were recorded, transcribed, and then deleted. The study involved 61 participants, averaging 49 years old. Almost half (47.5%) had completed high school. Qualitative data analysis revealed 9 thematic categories. Regarding the first question, 2 divergent categories emerged: care for life and threatening treatment. For the second question, opinions diverged into 4 categories: At an early stage, mid-course of the disease, as late as possible, and no time at all. For the third question, 3 categories emerged: communication and support, care setting and environment, and improving the PC experience. This study reveals diverse perspectives on patients' awareness and preferences for discussing PC, challenging the misconception that it's only for end-of-life (EOL) situations. Comprehending PC influences when and how patients discuss it. If tied solely to EOL scenarios, discussions may be delayed. Conversely, understanding its role in enhancing advance support encourages earlier conversations. Limited awareness might delay talks, while informed patients actively contribute to shared decision-making. Some patients prefered early involvement, others find mid-treatment discussions stress-relieving. Community support, quiet environments, and accessible resources, underscoring the importance of a calm, empathetic approach, emphasizing the importance of understanding its role in advance support and providing valuable implications for enhancing patient care practices, theories, and policies.

Integrated multi-manned disassembly line balancing problem with reverse supply chain design strategies by considering lot sizing

ABSTRACT Due to strict governmental regulations, manufacturers have increasingly focused on recovering end-of-life (EoL) products through disassembly lines, aiming to achieve economic benefits while addressing the environmental aspects of supply chain sustainability. Disassembly line balancing (DLB) has become a key challenge for enterprises seeking to perform environmentally conscious manufacturing as part of a closed-loop supply chain policy. Therefore, designing a sustainable closed-loop supply chain requires analyzing interrelated problems by focusing on strategic-, tactical-, and operational-level decisions simultaneously. This study introduces an integrated problem that addresses multi-manned DLB, lot sizing, and reverse supply chain (RSC) design problems. To mathematically represent the problem, a generic optimization model is developed to minimize overall costs, including station opening, inventory holding, shortage, transportation, and collection center/facility opening costs. This study addresses several research questions to explore the impact of distribution strategies (centralized and decentralized) on multi-manned DLB and lot size decisions within the context of reverse supply chain design.

Sustainable management of end of life crystalline silicon solar panels in Australia: Advancing circular economy practices

The worldwide adaptation of Photovoltaic (PV) technology as a sustainable alternative to fossil fuels, has experienced exponential growth in recent years. However, the lack of effective waste management policies has hindered efficient PV panel disposal and recycling practices. In the absence of effective policies, the worldwide End-of-Life (EoL) PV module accumulation is predicted to reach a critical stage in the early 2030s. This study examines the environmental impacts of different EoL management practices using Life Cycle Assessment (LCA), based on a comprehensive database generated from both literature and industrial data. Five different EoL scenarios were considered for 1000 kg of Crystalline Silicon (c-Si) PV modules with a focus on Australia as a case study, while considering the energy recovery options and emphasizing the economic benefits. From a comprehensive LCA study, it is found that upcycling options reduce the environmental impacts significantly compared to downcycling, while chemical treatment emerges as a preferred option, demonstrating a reduced environmental burden. Nevertheless, the utilization of toxic chemicals during chemical treatment-based PV recycling needs to be reconsidered. Additionally, the usage of chemicals during the metal recovery process of PV module recycling caused the highest environmental burden, necessitating the importance of moving to greener treatment practices. This research study will enable the identification of optimum EoL c-Si module recycling options, contributing to sustainable waste management.

A Robotic Teleoperation System with Integrated Augmented Reality and Digital Twin Technologies for Disassembling End-of-Life Batteries

Disassembly is a key step in remanufacturing, especially for end-of-life (EoL) products such as electric vehicle (EV) batteries, which are challenging to dismantle due to uncertainties in their condition and potential risks of fire, fumes, explosions, and electrical shock. To address these challenges, this paper presents a robotic teleoperation system that leverages augmented reality (AR) and digital twin (DT) technologies to enable a human operator to work away from the danger zone. By integrating AR and DTs, the system not only provides a real-time visual representation of the robot’s status but also enables remote control via gesture recognition. A bidirectional communication framework established within the system synchronises the virtual robot with its physical counterpart in an AR environment, which enhances the operator’s understanding of both the robot and task statuses. In the event of anomalies, the operator can interact with the virtual robot through intuitive gestures based on information displayed on the AR interface, thereby improving decision-making efficiency and operational safety. The application of this system is demonstrated through a case study involving the disassembly of a busbar from an EoL EV battery. Furthermore, the performance of the system in terms of task completion time and operator workload was evaluated and compared with that of AR-based control methods without informational cues and ‘smartpad’ controls. The findings indicate that the proposed system reduces operation time and enhances user experience, delivering its broad application potential in complex industrial settings.

Laser beam welding of T joints for aluminum–Copper–lithium aircraft panels: Effect of filler wire on recyclability and weldability

This study assessed the weldability and recyclability of four filler wires, two commercial (ER4047 and ER2319) and two experimental (ER2395 and J300), for laser beam welding of aluminum-Copper-lithium (Al–Cu–Li) aircraft panels. The results showed key differences in porosity and crack formation. The ER2319 filler exhibited a higher tendency for wormhole-type porosity compared to the others, which had similar pore area fractions. ER2395 displayed the longest crack length, likely due to its high lithium content. Chemical compatibility with the Al–Cu–Li base alloy AA2198 was confirmed for the ER2319, ER2395, and J300 filler wires, enabling 100% closed-loop recyclability without disassembly or alloy sorting. However, the high silicon content (around 11%) of ER4047 resulted in a recycled alloy that exceeded the allowable Si limit for AA2198, making it unsuitable for closed-loop recycling. Several end-of-life (EoL) strategies were explored for scrap fractions from ER4047-welded coupons. The 0C and 1C cutting strategies yielded hybrid fractions incompatible with AA2198 but suitable for the more Si-tolerant AA2196 alloy. The 3C strategy, involving weld seam separation before remelting, optimized recycling rates and minimized environmental impact. Additionally, a pre-scrap characterization method was developed to analyze weld seam composition, allowing for the prediction of recyclability issues and filler wire mass estimation in coupons where both the skin and stringer were made of the same alloy. This method provides a practical approach for evaluating welded structures in future recycling efforts.

Feasibility and Acceptability of a Palliative Care Intervention Among Older or Adults with Advanced CKD and their Caregivers.

In non-nephrology settings, specialty Palliative Care (PC) improves decision-making, patient's quality of life (QoL), advance care planning (ACP), and certain indicators of the quality of end-of-life (EoL) care. This pilot RCT explored the feasibility and acceptability of a PC intervention, CKD-EDU, for older adults ≥75 years with eGFR ≤25 ml/min and their caregivers. Participants randomized to the control group received standard nephrology care and routine kidney therapy (KT) education, while those randomized to CKD-EDU received a decision aid and met with a PC clinician up to three times to discuss KT decisions and EoL planning. Patients were assessed at baseline, 4-6, 12-14, and 24-26 weeks. Main outcomes included intervention feasibility and acceptability, decision-conflict, and patient QoL. The mediating effects of reduced decision conflict on improved QOL were explored, as were the effects of CKD-EDU on ACP, EoL treatment intensity and 6-month-hospitalization. Statistical analyses encompassed descriptive analyses, adjusted repeated-measure-models, mediation analyses and logistic-regression models. Among the 127 eligible patients screened, 58 (44%) consented: 30 were randomized to CKD-EUD and 28 to the control arm. All patients completed baseline assessments, and 89% completed at least one intervention session (n=26/29), underscoring intervention adherence and feasibility. Similarly, assessments completion rates at 4 (83%, n=45/54) ), 12 (93%, n=42/45), and 24 (95%, n=40/42) weeks were high. The intervention received over 85% acceptability ratings for all questions. Patients exposed to CKD-EDU exhibited significant improvement in decisional conflict scale scores (P = 0.003) at 4-6 weeks and improvements in QoL at 24-26 weeks (P=0.02). Exploratory analyses were not statistically significant in this pilot, but all effect sizes were in the predicted direction. This study demonstrates the feasibility and acceptability of CKD-EDU. A larger scale trial is warranted to assess its effectiveness in improving key outcomes important to patients and families.

Developing a robust indicator to evaluate circular economy through reuse strategy: A case study of using water treatment sludge as a coagulant for dewatering of iron ore tailings slurry

Due to the lack of tools, which are simple enough to assess the reuse strategy in the concept of circular economy (CE), in the present paper, reuse efficiency index (REI) was introduced as a new indicator, inspired by previously developed indexes, namely circular economy index (CEI) and value-based resource efficiency (VRE). The REI, as a measure of economic efficiency of reuse strategy, is the ratio of the net value obtained from the reuse of end of life (EOL) product instead of using a new product over the value of materials and energy inputs required to reproduce the EOL product. To calculate REI for any specific EOL product, information regarding mass, physicochemical properties and operational data on the consumption of energy, which are mainly available in the financial archives of companies, is crucial and the market price of EOL product must also be predicted. In another part of the study, the reuse of ferric chloride-based water treatment sludge (FCS) as a coagulant, instead of using high cost polymeric coagulant, for iron ore tailings slurry dewatering was evaluated through REI. The results showed that depending on the market prices of energy and materials as well as the iron (FeCl3) content in the FCS, the REI could vary between 0.51 and 1.04, corresponding to 51–104% added value. Overall, REI is based on accessible information and its simplicity and comprehensibility makes it applicable for managers and policymakers to invest and create technologies for reaching closed-loop cycles in the concept of CE through reuse action.

Sustainability assessment of additive manufacturing end-of-life material management

Additive manufacturing (AM) methods enable complex, customized, and on-demand production of many products from different material types across various industries. The growing demand for flexible and more sustainable manufacturing solutions places AM in the mix of processes considered for non-commodities. However, AM processes also present unintentional environmental releases in end-of-life (EoL) material management, compromising overall sustainability. Data availability to assess the sustainability of individual EoL material management from individual AM processes is limited. Even so, EoL materials generated across AM practices frequently overlap, supporting high-level assessment as an alternative approach. Therefore, a holistic AM EoL material management sustainability analysis was completed using a customized list of efficiency, environmental, energy, and economic indicators from the Gauging Reaction Effectiveness for the Environmental Sustainability of Chemistries with a multi-Objective Process Evaluator (GREENSCOPE) methodology. Subsequently, this assessment identified low material recycling rates and high energy costs in some EoL material management processes, such as incineration and recovery. Subsequently, a trade-off analysis was performed to determine process modification opportunities, including implementing recycling to reduce the amount of hazardous waste at the expense of additional energy and cost investment. The AM EoL-specific sustainability analysis serves as a resource to offer insights and empower policymakers and stakeholders to enhance pollution prevention strategies and optimize the existing EoL material management processes.

Predicting the most economical option of managing electric vehicle battery at the end of its serviceable life

It is predicted that millions of electric vehicle batteries (EVBs) will retire in the next decade. With the global Electric Vehicles (EVs) market share increasing to over 40 million by 2030, the replacement of unwanted EVBs will become more abundant and may end up in landfills. These discarded EVBs can become a threat to the environment and to human health if they are not treated, disposed of, and recycled appropriately. Numerous end-of-life (EOL) cost estimation methods that have been developed are mainly for evaluating fossil fuel vehicle components. Research within the scope of EOL of EVBs however, is slow in progress, therefore, this work focuses on developing a cost estimation method for predicting EOL costs of EVBs by adopting a circular economy approach. This proposed method is validated through a case study using two Nissan's EV battery packs. The significance of this study may provide valuable information which could, indirectly lead to the redesign of EVBs for better business circular economy and less waste pollution for future EVs. The main results show that the potential economic benefit that generated by reusing/repurposing EOL EVBs is 92% more profitable than recycling and 52% more profitable than remanufacturing. This study concludes that reuse/repurpose becomes the most profitable process when EVBs reach the end of their serviceable life. Remanufacturing method can also be economically viable if it considers multi-cell replacement of an EVB.

Review on Application of Sustainability, Circular and Digital Economy on Bioplastics Production

AbstractDigitalization is creating and driving a sustainable data driven production and consumption of materials and energy. The goal of this research was to outline circular economy and employ machine learning algorithms in the industry 4.0-environmental social and governance (ESG) for the bioplastic properties. The paper review sustainability, circular and digital economy and potential of biomasses on bioplastics production, tensile strength and degradation. Sustainability and circular economy are very crucial to adaptation and mitigation of climate change and social-economic responsibilities of the environmental and human health. It was found that most studies covered sustainability, few embed circular and digital economy. It was important to investigate the end-of life of a product, to know its effect to the environment and human health. There were limited studies on bioplastics production with the digital economy. It was discovered that machine learning approaches have the potential to improve quality control and optimization in industrial processes.

Association of inpatient and outpatient pediatric palliative care with healthcare utilization and end-of-life outcomes in pediatric oncology.

Pediatric palliative care (PPC) is associated with improved end-of-life (EOL) outcomes. Inpatient and outpatient PPC have unique roles during the disease course. Yet, it is unknown whether the location of PPC receipt (inpatient vs. outpatient) is associated with healthcare utilization and EOL outcomes for pediatric and adolescent and young adult oncology patients. A retrospective single-institution chart review of pediatric patients (age 0-28) with cancer who died between January 2015 and December 2022 was performed to compare EOL outcomes and healthcare utilization metrics among inpatient PPC, any outpatient PPC, and non-PPC recipients. Demographics and clinical factors were analyzed by PPC receipt location. Among 450 patients, 292 (64.9%) received PPC (inpatient only 35%, any outpatient 65%). Patients who died without receiving PPC dropped from 69% to 22% following development of an outpatient PPC clinic (p<.001). In the last 6months, 1month, and last week of life, inpatient PPC recipients spent more days admitted to the hospital and intensive care unit (all p<.001), and had more intensive medical interventions performed (p<.01). Outpatient PPC recipients were less likely to receive intravenous (IV) chemotherapy (p<.01) or intubation (p=.05), and more likely to receive hospice, die at home, and have an outpatient do-not-resuscitate order (all p<.001). PPC receipt substantially increased after the creation of an outpatient PPC clinic, suggesting that outpatient PPC is critical in the provision of PPC to children with cancer. Outpatient PPC was associated with fewer hospital days, IV chemotherapy, and intubation at EOL, while increasing hospice enrollment and home death.

Autonomous Battery Optimization by Deploying Distributed Experiments and Simulations

AbstractNon‐trivial relationships link individual materials properties to device‐level performance. Device optimization therefore calls for new automation approaches beyond the laboratory bench with tight integration of different research methods. This study demonstrates a Materials Acceleration Platform (MAP) in the field of battery research based on the problem‐agnostic Fast INtention‐Agnostic LEarning Server (FINALES) framework, which integrates simulations and physical experiments while leaving the active control of the hardware and software resources executing experiments or simulations with the partners running the respective units. This decentralization of control is a distinctive feature of MAPs using the FINALES framework. The connected capabilities entail the formulation and characterization of electrolytes, cell assembly and testing, early lifetime prediction, and ontology‐mapped data storage provided by institutions distributed across Europe. The infrastructure is used to optimize the ionic conductivity of electrolytes and the End Of Life (EOL) of lithium‐ion coin cells by varying the electrolyte formulation. Trends in ionic conductivity are rediscovered and the effect of the electrolyte formulation on the EOL is investigated. Further, the capability of this MAP to bridge diverse research modalities, scales, and institutions enabling system‐level investigations under asynchronous conditions while handling concurrent workflows on the material‐ and system‐level is shown, demonstrating true intention‐agnosticism.

Simulation-Based Design for Recycling of Car Electronic Modules as a Function of Disassembly Strategies

Modules (or parts) of a car are a complex functional material combination used to deliver a specified task for a car. Recovering all materials, energy, etc., into high-grade materials at their end of life (EoL) is impossible. This is dictated by the second law of thermodynamics (2LT) and thence economics. Thus, recyclability cannot be conducted with simplistic mass-based approaches void of thermodynamic considerations. We apply, in this paper, a process simulation model to estimate the true recyclability of various SEAT (Volkswagen Group) car parts within the EU H2020 TREASURE project. This simulation model is developed with 190 reactors and over 310 feed components with over 1000 reaction species in the 880 streams of the flowsheet. The uniqueness of the work in this paper is to apply the full material declaration (FMD) and bill of materials (BOM) of all 310 materials in the parts as a feed to the process simulation model to show the parts’ true recyclability. We classified all parts into categories, i.e., copper-rich, steel-rich and plastic-rich, to maximally recover metals at the desired material quality, as well as energy. Recyclability is understood to create high-grade products that can be applied with the same functional quality in these parts. In addition, disassembly strategies and related possible redesign show how much recyclability can be improved. Process simulation permits the creation of alloys, phases, materials, etc., at a desired quality. The strength of the simulation permits any feed from any End-of-Life part to be analyzed, as long as the FMD and BOM are available. This is analogous to any mineral and metallurgical engineering process simulation for which the full mineralogy must be available to analyze and/or design flowsheets. This paper delivers a wealth of data for various parts as well as the ultimate recovery of materials, elements, and energy. The results show clearly that there is no one single recycling rate for elements, materials, and alloys. It is in fact a function of the complexity and material combinations within the parts. The fact that we use a thermochemical-based process simulator with full compositional detail for the considered parts means full energy balances as well as exergy dissipation can be evaluated. This means that we can also evaluate which parts, due complex mixtures of plastics, are best processed for energy recovery or are best for material and metal recovery, with thermochemistry, reactor technology and integrated flowsheets being the basis.

Compassionate engagement of communities in support of palliative and end-of-life care: challenges in post-pandemic era.

Over the years, humanity has faced various global crises of different kinds that have caused great suffering in the community, such as wars, slavery, torture or the Holocaust, but also climate change, economic crises, or sanitary disasters. The recent pandemic posed a barrier to palliative and End-of-Life (EoL) care, as the need for physical distance made it difficult to retain essential human interactions while minimizing the risk of viral transmission. During the COVID-19 pandemic, the robustness of supportive networks (i.e., family, friends, neighbors, and community members) determined whether someone experienced a calm death at home or an unnecessary hospital admission, labeled as an 'emergency'. In this vein, active establishment and strengthening of such networks are the foundation of compassionate community efforts. Firstly, providing both physical and emotional support to the entire network of caregivers enhances their ability to care for others and improves the overall experience of death, including the process of dying and the ensuing bereavement period. Furthermore, individuals can enhance their own physical and mental health by practicing compassion. The ability of networks to withstand and recover from physical and emotional challenges, while maintaining strong and supportive relationships among its members, depends on the health and overall well-being of those members. Therefore, we argue that active community participation and death education can strengthen a community's capacity to assist people facing death, dying, and bereavement.

A cross-sectional study on advance care planning documentation attitudes during national advance care planning week in a South-East Asian country

BackgroundThrough advocacy initiatives such as roadshows during “National ACP Week”, the Agency for Integrated Care (AIC) had increased advance care planning (ACP) engagement since 2011. Project Happy Apples (PHA), a community initiative project led by medical students from the National University of Singapore, also conducted a public exhibition to raise ACP awareness during this period. This study aimed to investigate and identify predictors of attitudes towards ACP documentation among ‘ACP Week’ respondents which may be used to formulate strategies to increase ACP documentation in Singapore.MethodsA cross-sectional study on ACP documentation attitudes of 262 respondents during local roadshows were conducted. Multiple logistic regression models were built to investigate the associations between demographic variables and attitudes toward ACP documentation.ResultsThe mean age was 43.5 years (SD = 17.4), 79 (30.15%) were males and 49 (18.7%) were healthcare professionals (HCP). 117 (44.66%) respondents had prior experience with serious illness and 116 (44.27%) had heard of ACP. Age was a significant predictor of readiness to sign official papers naming nominated healthcare spokesperson (NHS) (OR = 1.04, 95%CI: 1.02–1.07). Experience with serious illness was a significant predictor of readiness to discuss end-of-life (EOL) care with healthcare professionals (HCP) (OR = 3.65, 95%CI: 1.36–11.61). Being female was a significant predictor for readiness to speak to their nominated healthcare spokesperson about EOL care (OR = 7.33, 95%CI: 2.06–46.73). Subgroup analyses revealed that those aged 20–39 were less likely to speak to their healthcare professional about or sign official papers regarding EOL care. We also found that being a healthcare professional does not necessitate better or worse attitudes.ConclusionAdvocacy programs tailored to targeting respondents of different age groups and prior experience with serious illness may improve the efficacy of advocacy efforts.

Decarbonization pathways analysis and recommendations in the green steel supply chain of a typical steel end user-automotive industry

China's automotive industry, the world's largest producer and consumer, has reached a crucial stage in its transition from rapid expansion to high-quality and low-carbon development. Considering the decarbonization of the whole automotive industry, in addition to reducing the CO2 emissions from fuel supply and exhaust pipes, which account for 65–80 % of the total value chain CO2 emissions, the automotive industry should also accelerate the decarbonization of raw materials, which contribute to 18–22 % of these CO2 emissions. Many automotive manufacturers are collaborating with steel producers on green steel initiatives due to the high CO2 emissions from steel production, the integrated nature of the steel supply chain, and the need for early planning in low-carbon steel production routes transformation. To clarify the carbon emission characteristic of the automotive steel supply chain, this research establishes a mathematical method for calculating cradle-to-gate carbon footprint of automotive steel product based on BF (Blast furnace)-BOF (Basic oxygen furnace), Scrap-EAF (Electric arc furnace), and DRI (Direct reduced iron)-EAF steel production routes. The cradle-to-gate carbon footprints of BF-BOF, Scrap-EAF, and DRI-EAF steel production routes are 1711.84 kgCO2/t-sp (steel product), 916.39 kgCO2/t-sp, and 2738.53 kgCO2/t-sp. A projection of CO2 emissions in automotive steel supply chain from 2020 to 2060 has been investigated, taking into account production structure adjustment, scrap recycling, and low-carbon electricity adoption, as well as the demand for automotive steel products. Projections from 2020 to 2060 indicate that the CO2 emission intensity of the automotive steel supply chain will decrease by 28.25 % by 2030 and 93.99 % by 2060, with total emissions dropping by 28.47 % and 96.92 %, respectively. This research identifies effective decarbonization measures in the automotive steel supply chain, including internal and end-of-life (EOL) steel scrap recycling, which offer significant CO2 emissions reduction without increased costs, demonstrating high cost-effectiveness. In a word, this research provides a technical framework and data foundation for decarbonizing the automotive steel supply chain.

"Death Is Not a Dirty Word:" A Qualitative Study of Emergency Clinician End-of-Life Communication.

Pediatric patients with life-limiting diagnoses frequently seek care in the pediatric emergency department (PED) during times of acute illness, or at end-of-life (EOL) . Although the population of patients with life-limiting diagnoses is heterogenous, clinician expertise in EOL communication is essential to providing family-centered care. In this study, we explored PED physician and nurse experiences with communication when eliciting EOL values, including factors specified to the PED environment, clinician perceptions of family supports and preferences, and clinicians' self-reflection of their skills and challenges in this sphere. We performed a prospective qualitative study using semistructured interviews of PED physicians and nurses recruited from a quaternary care center. Thematic content analysis was performed on the transcribed interviews to identify codes and, ultimately, themes. We interviewed 17 emergency department clinicians, including 10 physicians and 7 nurses. Thematic content analysis revealed 6 salient themes. The first theme related to contextual factors of the emergency department environment. Two additional themes related to patient and family characteristics, including unique patient and family factors and clinician interpretation of parental/family needs. Lastly, we found 3 clinician-focused themes including knowledge gaps in EOL communication, communication styles and priorities in EOL conversations with families, and coping with ethical challenges. PED clinicians report communication-related challenges to providing optimal care for families and patients with life-limiting diagnoses. Participants self-identified gaps in communication skills in this area. Future studies should focus on clinician educational interventions on the basis of this needs assessment and include family perspectives to develop best practice.

Reusable timber modular buildings, material circularity and automation: The role of inter-locking connections

As sustainability becomes a central concern in construction, the industry witnesses a significant surge in the adoption of material circularity principles, reflecting a new approach to resource management. Although mass timber construction holds significant potential for end-of-life (EoL) material circularity due to its natural materials and prefabrication, conventional connection systems hinder material reuse. Integrating interlocking techniques into modular construction could enhance circularity and enable future autonomous construction. This paper summarises design-for-reuse (DfR) strategies focusing on connection design for rapid assembly and disassembly of Cross-Laminated Timber (CLT) modules. These strategies can promote innovative connections with enhanced material circularity, which were illustrated through a recently proposed conceptual interlocking connections (MOD-IT). Additionally, a comparative cradle-to-cradle Life Cycle Assessment (LCA) evaluates the environmental impact and circularity potential of timber modular buildings using this connection system. The study underscores the pivotal role of strategic connection design in achieving a closed-loop system in timber construction. This advancement fosters sustainability by improving efficiency, adaptability, reusability, and autonomy in the construction process.

Direct recycling of anode active material from Li-ion batteries using TiNb2O7 anode

As the demand for large lithium-ion batteries (LIBs) for automotive and other applications rapidly grows, recycling of electrode materials has become essential owing to the large amount of waste material generated by battery manufacturing (e.g., battery scrap) and end-of-life (EOL) batteries. While there have been many studies on recycling of cathode materials, we propose a direct recycling process for anode material using TiNb2O7 (TNO) as the active material, as it offers high capacity and long life. Calcination was introduced to separate the anode active material from the current-collecting foil, and a regeneration method was investigated for TNO anodes from scrap and EOL battery waste. After calcination, the active material can be easily separated from the aluminum current-collecting foil owing to the binder disappearing. The structure of the active material was investigated using X-ray diffraction and scanning electron microscopy. TNO active material recycled from scrap and EOL was found to maintain the structure of virgin material. A cell was fabricated using recycled TNO and cell performance was evaluated. The cell capacity and rate capacity were found to be almost equivalent to those of virgin material. In terms of the carbon footprints of products (CFP), CO2 emissions during the recycling process were compared between recycled material and virgin material, and it was found that CO2 emissions were reduced to 0.7-CO2eq/kg for scrap material and 3.8-CO2eq/kg for EOL waste material, compared with 4.8-CO2eq/kg for virgin material. Thus, the feasibility of low CO2 emissions during TNO anode direct recycling was confirmed in principle. A simple and low CO2 emission recycling loop can thus be constructed by employing a stable TNO active material structure and direct-recycling process with calcination.