Rapid Heating Technologies for Efficient Recycling of Spent Lithium-Ion Batteries.

Emerging trends in sustainable battery chemistries

There is widespread employment of Lithium - ion batteries (LIBs) in various applications, covering portable electronics as well as electric vehicles, because of their high energy density and long cycle life. However, their improper disposal and the extraction of raw materials pose significant environmental and resource challenges. This review focuses on LIB recycling, a critical area for mitigating these issues. By comprehensively analyzing numerous relevant studies, it explores current recycling technologies, challenges, and future prospects. The results show that pretreatment, pyrometallurgical, hydrometallurgical, biohydrometallurgy, and direct recycling technologies all have their own benefits and drawbacks. Pretreatment involves sorting and dismantling, which is labor-intensive but essential for efficient recycling. Pyrometallurgical methods are effective for metal recovery but are energy-intensive and emit pollutants. Hydrometallurgical processes offer high recovery rates with lower energy consumption but generate chemical waste. Biohydrometallurgy, using microorganisms, is environmentally friendly but still in the experimental stage. Direct recycling aims to reuse battery materials with minimal processing, preserving their structure and reducing costs. LIB recycling also faces technical, environmental, and economic challenges, such as the complexity of battery designs, hazardous waste management, and high operational costs. However, technological innovations, policy support, and circular economy-based business model innovation hold promise for its sustainable development. In conclusion, establishing an efficient and sustainable LIB recycling system requires continuous improvement of recycling technologies, strengthened environmental protection measures, and exploration of innovative business models that promote resource efficiency and environmental sustainability.

Lithium-ion batteries (LIBs) have emerged as an indispensable power source, driving innovations across a range of sectors, including consumer electronics, electric vehicles, and renewable energy deployment. However, the exponential growth in LIB demand has paralleled concerns regarding their end-of-life management. Key characteristics of spent LIBs include capacity fading due to repeated charge and discharge processes, loss of lithium inventory, and chemo-mechanical degradation of crystalline lattice in cathode active material. Pyrometallurgy and hydrometallurgy, the most prominent methods of LIB recycling, indirectly extract only critical metals from spent batteries but require significant energy inputs, use of harsh chemicals, and suboptimal operating conditions only to recover metal salts and require future resynthesis of the cathode active material. Direct recycling, an alternative to these process-intensive methods, allows for the regeneration of cathode active material with its structure and morphology intact, thereby conserving valuable resources directly from spent batteries and minimizing the need for extensive processing of recycled material and waste product. Solid-state sintering and thermal relithiation have recently gained traction as direct recycling alternatives, but they operate at relatively high temperature and pressure, which translates to high process intensity at scale.This presentation will discuss the effectiveness of a novel direct recycling method for LiNi0.5Mn0.3Co0.2O2 (NMC 532), a common cathode active material widely used in electric vehicles and energy storage systems. The process restores the structure and capacity of spent NMC 532 via a reduction and relithiation mechanism at standard temperature and pressure using an inorganic solution in aqueous media. The solution effectively reduces transition metals in the cathode to their original oxidation states, restores lithium vacancies that have accumulated through battery cycling, and reverses degradation of the crystalline lattice. Unlike typical solution-based direct recycling methods, this process does not require input of energy for the reaction to proceed and can be carried out in ambient operating conditions with minimal waste byproducts. Carrying out this one-step process on spent NMC 532 produces cathode active material that is identical in crystalline structure to its pristine counterpart, as validated by x-ray diffraction (XRD) characterization while galvanostatic cycling of regenerated cathode further demonstrates the restoration of peak performance capacity. The effects of water on the cathode material surface are studied to gain an understanding of electrode recycling efficiency in aqueous conditions. This study is the first to successfully implement direct recycling of NMC 532 at room temperature and pressure in aqueous media. The ambient reaction conditions and use of water as primary solvent eliminates the need for energy input and minimizes the extensive use of harmful solvents that result in toxic waste. The efficacy of this approach renders it scalable and more sustainable as a long-term solution to the management of end-of-life batteries.

The burgeoning accumulation of spent lithium-ion batteries (LIBs), a byproduct from the widespread adoption of portable electronics and electric vehicles, necessitates efficient recycling strategies. Direct recycling represents a promising strategy to maximize the value of LIB waste and minimize harmful environmental outcomes. However, current efforts to large-scale direct recycling face challenges stemming from heterophase residues (e.g., Li2CO3, LiOH) in the recycled products and uncontrolled interfacial instability, often requiring repeated washing that generates significant wastewater. Here, a refined direct recycling process is proposed to improve cathode interface stability by leveraging in situ reaction between surface residual lithium species and a weak inorganic acid to form a conformal Li+ conductive coating that stabilizes the regenerated Ni-rich cathodes with significantly reduced water footprint. The findings reveal that the conductive coating also prevents direct contact between contaminants and the cathode surface, thus improving the ambient storage stability. By eliminating the need for extensive washing, this intensified recycling process offers a more sustainable approach with the potential to transition from laboratory to industrial-scale applications, improving both product quality and environmental sustainability.

Lithium-ion batteries (LIBs) have become a hot topic worldwide because they are not only the best alternative for energy storage systems but also have the potential for developing electric vehicles (EVs) that support greenhouse gas (GHG) emissions reduction and pollution prevention in the transport sector. However, the recent increase in EVs has brought about a rise in demand for LIBs, resulting in a substantial number of used LIBs. The end-of-life (EoL) of batteries is related to issues including, for example, direct disposal of toxic pollutants into the air, water, and soil, which threatens organisms in nature and human health. Currently, there is various research on spent LIB recycling and disposal, but there are no international or united standards for LIB waste management. Most countries have used a single or combination methodology of practices; for instance, pyrometallurgy, hydrometallurgy, direct recycling, full or partial combined recycling, and lastly, landfilling for unnecessary waste. However, EoL LIB recycling is not always easy for developing countries due to multiple limitations, which have been problems and challenges from the beginning and may reach into the future. Laos is one such country that might face those challenges and issues in the future due to the increasing trend of EVs. Therefore, this paper intends to provide a future perspective on EoL LIB management from EVs in Laos PDR, and to point out the best approaches for management mechanisms and sustainability without affecting the environment and human health. Significantly, this review compares the current EV LIB management between Laos, neighboring countries, and some developed countries, thereby suggesting appropriate solutions for the future sustainability of spent LIB management in the nation. The Laos government and domestic stakeholders should focus urgently on specific policies and regulations by including the extended producer responsibility (EPR) scheme in enforcement.

Assessment of the lifecycle carbon emission and energy consumption of lithium-ion power batteries recycling: A systematic review and meta-analysis

Review of life cycle assessment on lithium-ion batteries (LIBs) recycling

Lithium-ion batteries (LIBs) are an indispensable power source for electric vehicles, portable electronics, and renewable energy storage systems due to their high energy density and long cycle life. However, the exponential growth in production and usage has necessitated highly effective recycling of end-of-life LIBs to recover valuable resources and minimize the environmental impact. Pyrometallurgical and hydrometallurgical processes are the most common recycling methods but pose considerable difficulties. The energy-intensive pyrometallurgical recycling process results in the loss of critical materials such as lithium and suffers from substantial emissions and high costs. Solvent extraction, a hydrometallurgical method, offers energy-efficient recovery for lithium, cobalt, and nickel but requires hazardous chemicals and careful waste management. Direct recycling is an alternative to traditional methods as it preserves the cathode active material (CAM) structure for quicker and cheaper regeneration. It also offers environmental advantages of lower energy intensity and chemical use. Hybrid pathways, combining hydrometallurgical and direct recycling methods, provide a cost-effective, scalable solution for LIB recycling, maximizing material recovery with minimal waste and environmental risk. The success of recycling methods depends on factors such as battery chemistry, the scalability of recovery processes, and the cost-effectiveness of waste material recovery. Though pyrometallurgical and hydrometallurgical processes have secured their position in LIB recycling, research is proceeding toward newer approaches, such as direct and hybrid methods. These alternatives are more efficient both environmentally and in terms of cost with a broader perspective into the future. In this review, we describe the current state of direct recycling as an alternative to traditional pyrometallurgical and hydrometallurgical methods for recuperating these critical materials, particularly lithium. We also highlight some significant advancements that make these objectives possible. As research progresses, direct recycling and its variations hold great potential to reshape the way LIBs are recycled, providing a sustainable pathway for battery material recovery and reuse.

The rapid proliferation of electric vehicles equipped with lithium-ion batteries (LIBs) presents serious waste management challenges and environmental hazards for recyclers after scrap. Closed-loop recycling contributes to the sustainable development of batteries and plays an important role in mitigating raw material shortages and supply chain risks. Herein, current direct cathode regeneration methods for industrialized recycling are outlined and evaluated. Different regeneration methods for spent cathode materials are summarized, which provide a new perspective for realizing closed-loop recycling of LIBs. A reference recycling route for retrofitting existing cathode production lines is proposed and minimizes the costs. In addition to promoting the industrialization of direct cathode recycling, the environmental, economic, and political benefits of battery recycling are also highlighted.

Adopting EVs has been widely recognized as an efficient way to alleviate future climate change. Nonetheless, the large number of spent LiBs associated with EVs is becoming a huge concern from both environmental and energy perspectives. This review summarizes the three most popular LiB recycling technologies, the current LiB recycling market trend, and global recycling magnates’ industrial dynamics regarding this subject. We mainly focus on reviewing hydrometallurgical and direct recycling technologies to discuss the advancement of those recycling technologies and their future commercialization pathway.

Spent lithium-ion battery recycling – Reductive ammonia leaching of metals from cathode scrap by sodium sulphite

By 2025, the lithium-ion battery and disposal markets are forecast to reach $ 93 billion and $14 billion respectively. Logistics contribute to these costs, but processing takes its toll with energy intensive industrial smelting and/or hydrometallurgical technologies. As traction and storage cathode materials use less cobalt, these recycle technologies require centralized, large scale facilities to meet economic viability based upon the metal. Cobalt dilute or cobalt free applications may therefore require disposal fees, which is not helpful for circular economic sustainability for the advanced lithium-ion battery industry. Another technological approach is necessary to address this challenge for the industry. Direct recycling has potential for cost effective recycling of lithium-ion cathodes, which is demonstrated for NMC532 and NMC622 in this work. In the first example, NMC 532 electric vehicle grade cells were faded to 80% of their original capacity. The cells were pulverized and cathodes captured and treated and packaged. Afterwards, in a manufacturing setting, 2.2 Ah cells were built using the recycled cathode and graphite. Recycled cathode demonstrated both performance and manufacturability like new material. In side by side cycle testing, both tallied 2,500 cycles at C/10 to reach 80% of original capacity. In the second example, starting with faded cells, NMC 622 is similarly regenerated to original capacity and rate capability. Physical characterization of NMC622 before and after processing shows the treatment reverses ageing in the surface region of the electrode particles resulting in renewed performance. These examples show the ease and flexibility of hydrothermal and calcination processes to restore electrochemical performance to NMC cathode materials. A comparable industrial process is alumina production from bauxite, which has a world-wide production over 60,000 tons and demonstrates the scalability and low cost potential for direct recycling. The development of distributed direct recycling services reduces both logistical and production costs relative to the current approach. Direct recycling technologies provide a viable foundation for the future waste management services for the lithium-ion battery market. Figure 1

The Nobel Prize winning technology lithium-ion battery (LIB) has seen an annual market growth rate of 24% over the last decade. This rapid market expansion brings a huge amount of hazardous battery waste from end-of-life (EOL) disposal and creates concerns over the long-term sustainability of critical elements for producing batteries. There is an urgent need to develop effective battery recycling infrastructure to address these challenges. The incumbent indirect pyrometallurgical and hydrometallurgical recycling methods lead to high energy consumption and process cost, water contamination and low-value elemental products. [1,2] In contrast, direct recycling process that extract and restore high-value cathode materials (2-10 times more valuable than their corresponding elemental constituents depending on the chemistries used [3]) to their virgin composition, structure, morphology and electrochemical performance with minimal energy and environmental impact. We have developed disassembly automation and materials regeneration processes for direct recycling of LIBs. [4,5] The pouch cell with discrete electrode sheets separated via continuous z-folding separator dominates the design of the commercially available LIBs and is used here to introduce our direct disassembly process. The customized automatic disassembly machinery safely dismantles the cell pouch, separating anode and cathode sheets, and sort cell components (i.e., cathode sheets, anode sheets and separators) into different waste streams. The EOL cathode materials are retrieved and separated for relithiation via an effective electrochemical intercalation method. The dried cathode materials are then heat-treated after which the regenerated cathode materials exhibit physical properties and electrochemical performance is comparable to virgin commercial materials.[5][1] L. Gaines, K. Richa, J. Spangenberger, Key issues for Li-ion battery recycling, MRS Energy Sustain. 5 (2018). https://doi.org/10.1557/mre.2018.13.[2] G. Harper, R. Sommerville, E. Kendrick, L. Driscoll, P. Slater, R. Stolkin, A. Walton, P. Christensen, O. Heidrich, S. Lambert, A. Abbott, K. Ryder, L. Gaines, P. Anderson, Recycling lithium-ion batteries from electric vehicles, Nature. 575 (2019) 75–86. https://doi.org/10.1038/s41586-019-1682-5.[3] J.B. Dunn, L. Gaines, J.C. Kelly, K.G. Gallagher, Life Cycle Analysis Summary for Automotive Lithiumion Battery Production and Recycling, in: R.E. Kirchain, B. Blanpain, C. Meskers, E. Olivetti, D. Apelian, J. Howarter, A. Kvithyld, B. Mishra, N.R. Neelameggham, J. Spangenberger (Eds.), Rewas 2016 Mater. Resour. Sustain., John Wiley & Sons, Inc., 2016: pp. 73–79. https://doi.org/10.1002/9781119275039.ch11.[4] L. Li, P. Zheng, T. Yang, R. Sturges, M.W. Ellis, Z. Li, Disassembly Automation for Recycling End-of-Life Lithium-Ion Pouch Cells, JOM. 71 (2019) 4457–4464. https://doi.org/10.1007/s11837-019-03778-0.[5] T. Yang, Y. Lu, L. Li, D. Ge, H. Yang, W. Leng, H. Zhou, X. Han, N. Schmidt, M. Ellis, Z. Li, An Effective Relithiation Process for Recycling Lithium-Ion Battery Cathode Materials, Adv. Sustain. Syst. n/a (n.d.) 1900088. https://doi.org/10.1002/adsu.201900088.

Structural Restoration of Degraded LiFePO ₄ Cathode with Enhanced Kinetics Using Residual Lithium in Spent Graphite Anodes

The need to recover valuable metals from spent lithium-ion batteries (LIBs) is undisputed. However, the environment and the climate are also affected by emissions from the recycling processes. Therefore, the call for environmentally friendly recycling methods is currently louder than ever. In the field of hydrometallurgical recovery of metals from spent LIBs, inorganic acids have so far proved to be an effective, but environmentally problematic, leaching agent, since the pollution of wastewater by high salt loads and the emission of toxic gases cannot be avoided. This has recently led to a trend towards the application of organic acids, as these have significantly more environmentally friendly properties. In order to continue this approach, and to improve it even further from an environmental point of view, this work focuses on the utilization of low leaching temperatures in combination with organic acids for the recovery of valuable metals from spent lithium-ion batteries. This can drastically reduce the required energy demand. Furthermore, attention is paid to higher (50–100 g·L−1) solid-liquid ratios, which are indispensable, especially with regard to the economic establishment of the tested process. The experimental verification of the feasibility using citric, oxalic, and formic acid showed the possibility of an efficient recovery of cobalt, nickel, and lithium. In particular, citric acid in combination with hydrogen peroxide as a reducing agent appears to be a suitable and environmentally friendly alternative to classical inorganic acids, even at low process temperatures, for the hydrometallurgical recycling of lithium-ion batteries.