Enhanced Energy Storage Properties Research Articles

Synergistic enhanced energy storage performance of NBT-KBT ceramics by K0.5Na0.5NbO3 composition design

(1–x)(0.8Na0.5Bi0.5TiO3-0.2K0.5Bi0.5TiO3)-xK0.5Na0.5NbO3 (x = 0, 0.1, 0.2, 0.3, 0.4) (NBT-KBT-KNN) ceramic solid solution was synthesized by solid phase method through designing KNN composition. XRD, Raman and SEM results show that NBT-KBT-KNN ceramics form solid solutions with a stable perovskite structure. The dielectric temperature spectrum and impedance spectrum analysis confirmed that the relaxor ferroelectrics (RFE) properties enhanced with increasing KNN content. The piezoresponse force microscopy (PFM) results reveal that the introduced KNN disrupts the microdomains of NBT-KBT ceramics and promotes the formation of nanodomains, leading to enhanced energy storage properties. The breakdown electric field strength (BDS) was also increased with increasing KNN content, and maximum value was obtained at x = 0.2. The addition of KNN can obviously improve energy storage performance (ESP). At 255 kV cm–1, x = 0.2 produced excellent ESP with recoverable energy storage density (Wrec), amazingly normalized response (ξ), efficiency (η) and maximum polarization (Pmax) are 3.38 J cm–3, 132.55 J kV–1 m–2, 85.4 %, and 45.76 μC cm–2, respectively. ESP is also stable in terms of frequency and temperature at (1–100 Hz) and (20–140 °C). At 120 kV cm–1, the discharge energy density (Wdis), power density (PD), Current density (CD) and time for releasing 90 % of total energy density (t0.9), are 0.202 J cm–3, 23.43 MW cm–3, 390.42 A cm–2, and 56.6 ns. These findings demonstrate that NBT-KBT-KNN ceramics have the ability to be reliable energy storage and pulse power capacitors.

Enhanced energy storage properties of 0.93NaNbO3–0.07Bi(Mg0.5Zr0.5)O3 ceramics by doping linear perovskite material

Enhanced energy storage properties of 0.93NaNbO3–0.07Bi(Mg0.5Zr0.5)O3 ceramics by doping linear perovskite material

Synthesis of functionalized ZnO nanoflake loaded polyvinylidene fluoride composites with enhanced energy storage properties

AbstractPolymer composite films are ideal materials for advanced energy storage capacitor in electrical systems. Therefore herein, we fabricated a novel series of polyvinylidene fluoride (PVDF) based composites embedded with well dispersed ZnO@APTES {surface modified zinc oxide with (3‐Aminopropyl) triethoxysilane (APTES)} nanoflake (0, 20, 30, 40, 50) vol% through solution casting method. Hydrothermally synthesized two‐dimensional ZnO was pre‐treated with H2O2 and surface modified with APTES for perfect distribution of nanoflake into PVDF matrix. Surface modification and high aspect ratio morphology of ZnO@APTES enhanced the interfacial interaction between organic PVDF and inorganic ZnO through reduction in heterogeneity between them. Surface functionalization reduced the dielectric loss and improved the overall energy storage performance. Investigation of electrical properties proclaimed incorporating 30 Vol% ZnO@APTES in PVDF as optimized loading due to its appreciable Wrec (recoverable energy density) about 3.2 J/cm3. Relative comparison of the energy storage density (Wrec) of PVDF/ZnO@APTES (30) vol% with recent published works established its enhanced capacitive response and its future application in energy storing portable device.

Heterointerface construction of carbon coated cobalt-iron phosphide space-confined in hollow porous carbon balls to promote internal/external sodium storage kinetics

Metal phosphides exhibit enormous potential in energy storage systems owing to their diversified species, suitable redox potential, and high theoretical capacities. Herein, heterostructured CoP/FeP coated with carbon layer and confined in hollow porous carbon balls (HPCBs) to construct a ball in ball architecture with interior voids is synthesized through a room temperature wet-chemistry method and a phosphatization route with Prussian blue analogues as the precursor. The composite exhibits enhanced energy storage properties when utilized for sodium-ion batteries. The excellent property of the composite can be ascribed to the delicately design of the metal phosphide heterostructure and the coating and confinement effect of carbonaceous materials synchronously. Experimental and theoretical calculation results demonstrate the heterostructure is constructed to acquire charge redistribution and lattice distortion to boost internal reaction kinetics. And the combination of the dual carbonaceous materials, possessing the ability of prevent the aggregation of active substances, the exceptional mechanics buffer capability of interior voids provided by HPCBs, and the excellent electrical characteristics of carbon layers and HPCBs to promote external energy storage kinetics and intergranular charge transfer. The research provides an effective strategy for the melioration of internal/external reaction kinetics to deliver ions durably and efficiently in energy storage regions.

Enhanced Energy Storage Properties in Lead-Free (Na0.5Bi0.5)0.7Sr0.3TiO3-Based Relaxor Ferroelectric Ceramics through a Cooperative Optimization Strategy.

Although relaxor ferroelectrics have been widely investigated owing to their various advantages, there are still impediments to boosting their energy-storage density (Wrec) and energy-storage efficiency (η). In this paper, we propose a cooperative optimization strategy for achieving comprehensive outstanding energy-storage performance in (Na0.5Bi0.5)0.7Sr0.3TiO3 (NBST)-based ceramics by triggering a nonergodic-to-ergodic transformation and optimizing the forming process. The first step of substituting NaNbO3 (NN) for NBST generated an ergodic state and induced polar nanoregions under the guidance of a phase-field simulation. The second step was to apply a viscous polymer process (VPP) to the 0.85NBST-0.15NN ceramics, which reduced porosity and increased compactness, resulting in a significant polarization difference and high breakdown strength. Consequently, 0.85NBST-0.15NN-VPP ceramics optimized by this cooperative two-step strategy possessed improved energy-storage characteristics (Wrec = 7.6 J/cm3, η = 90%) under 410 kV/cm as well as reliable temperature adaptability within a range of 20-120 °C, outperforming most reported (Na0.5Bi0.5) TiO3-based ceramics. The improved energy-storage performance validates the developed ceramics' practical applicability as well as the advantages of implementing a cooperative optimization technique to fabricate similar high-performance dielectric ceramics.

Carbon-Shielded Selenium-Rich Trimetallic Selenides as Advanced Electrode Material for Durable Li-Ion Batteries and Supercapacitors.

In order to achieve a sustainable future, researchers must continue to research improved electrode materials. Considering the high electronic conductivity, versatile redox activity, and enhanced energy storage performance, nanostructures have been employed as a novel electrode material for high-performance lithium-ion batteries (LIBs) and supercapacitors. Herein, carbon-coated selenium-rich trimetallic selenide (Cu2 NiSnSe4 @C) nanoparticles (NPs) as an efficient electrode material in energy storage devices are prepared. The prepared core-shell Cu2 NiSnSe4 @C NPs electrode is employed as ananode material for LIBs, which demonstrated a high reversible specific capacity of 988.46mA h g-1 over 100 cycles at 0.1 A g-1 with good rate capability. Additionally, the core-shell Cu2 NiSnSe4 @C NPs electrode exhibited an outstanding capacity of 202.5mA h g-1 at 5 A g-1 even after 10 000 cycles. Exploiting the synergistic characteristics, the core-shell Cu2 NiSnSe4 @C NPs material is also investigated as a battery-type electrode for hybrid supercapacitors. The assembled hybrid supercapacitor with Cu2 NiSnSe4 @C NPs and activated carbon showed excellent rate capability including high power (5597.77W kg-1 ) and energy (64.26Wh kg-1 ) densities. Considering the simple synthesis and enhanced energy storage properties, carbon-coated selenium-rich trimetallic selenide can be used as a durable electrode material for practical energy storage devices.

Enhanced energy storage properties in BNT-based ceramics with a morphotropic phase boundary modified by Sr(Mg1/3Nb2/3)O3

The development of dielectric capacitors for applications under medium-low fields is of great significance to the integration and miniaturization of electronic circuits.

Enhanced energy storage properties in Sr1.85Ca0.15NaNb5O15-based tungsten bronze ceramics through multicomponent substitution

Enhanced energy storage properties in Sr1.85Ca0.15NaNb5O15-based tungsten bronze ceramics through multicomponent substitution

Enhanced energy storage properties of Bi(Ni1/2Zr1/2)O3-modified BaTiO3-based ceramics

Enhanced energy storage properties of Bi(Ni1/2Zr1/2)O3-modified BaTiO3-based ceramics

Heterostructure Interface Construction of Cobalt/Nickel Diselenides Hybridized with sp2–sp3 Bonded Carbon to Boost Internal/External Sodium and Potassium Storage Dynamics

Metal selenides exhibit great potential in energy storage systems owing to their diversified species, large interlayer spaces, and high theoretical specific capacity according to multiple ion-storage behaviors. In this work, heterostructured CoSe2/NiSe2 coupled with sp3 bonded N-doped carbon coating layers and interconnected with sp2 bonded carbon nanotubes is synthesized through a room-temperature wet-chemistry approach and a selenization route with Co–Ni Prussian blue analogues as the precursor. The hybrid exhibits enhanced energy storage properties when utilized as an anode material for sodium- and potassium-ion batteries. The excellent performance of the hybrid can be indexed to the delicately design of the CoSe2/NiSe2 heterostructure and the hybridization of it with sp2 and sp3 bonded carbonaceous materials synchronously. Experimental and theoretical calculation results demonstrate the heterostructure is constructed to acquire charge transfer driving forces to boost internal reaction dynamics. And there is a combination of the dual advantages of sp3 and sp2 bonded carbon, possessing not only the exceptional mechanics buffer capability of N-doped carbon coating layers but also the excellent electrical characteristics of carbon nanotubes to promote external reaction dynamics. In addition, to elucidate the differential sodium/potassium storage capability of the hybrid, theoretical calculations are further performed to indagate the adsorption energy of sodium and potassium on the CoSe2/NiSe2 heterointerface by establishing five Na/K adsorption sites. The research provides an effective strategy for the melioration of internal/external reaction dynamics to deliver ions durably and efficiently in energy storage regions.

Enhanced energy storage properties of BNT-based ceramics via composition and multiscale structural engineering

Under the background of the urgent development of electronic components towards integration, miniaturization and environmental protection, it is of great economic value to research ceramics with large energy storage density (Wrec) and high efficiency (η). In this study, the ceramics of (1-x)Bi0.5Na0.5TiO3-xSrTi0.8Ta0.16O3 ((1-x)BNT-xSTT) are prepared to explore the relationship between energy storage properties and multiscale structure. With increasing the content of STT, the rhombohedral phase of BNT becomes pseudo-cubic phase, the average grain size is refined, the resistivity is improved, and the concentration of oxygen vacancy is decreased, hence the dielectric breakdown strength (Eb) is significantly promoted from 120 kV/cm for BNT to 245 kV/cm for 0.6BNT-0.4STT. Eventually, the 0.65BNT-0.35STT ceramic exhibits a large Wrec of 3.3 J/cm3 and a high η of 90.4% under 230 kV/cm, showing outstanding potential in pulse power systems.

Ultrafast synthesizing nanoflower-like composites of metal carbides and metal oxyhydroxides towards high-performance supercapacitors

Because of their outstanding electrochemical performance and high theoretical specific capacity, metal oxyhydroxides or metal hydroxides have been paid significant attention as electrode materials for supercapacitors. Unfortunately, because of their poor conductivity, the experimental capacity is considerably lower than the theoretically expected value. Similarly, the use of 2D transition metal carbides (MXene) in energy storage electronic devices has also drawn research attention. However, its self-restacking makes it difficult for electrolyte ions to reach the material's active sites. Therefore, in this research work, an ultrafast one-step method for the synthesis of 3D nanoflower-like MXene/metal oxyhydroxide composites has been proposed. Composite materials synergistically combine the high theoretical capacity of metal oxyhydroxides with good electrical conductivity of MXene, resulting in excellent supercapacitive performance. The resulting composite delivered the highest specific capacity of 955.08 C/g at a scan rate of 5 mV/s and its maximum energy density of 32.13 Wh/kg is attained at a power density of 324.97 kW/kg due to synergistic combination of MXene and metal oxyhydroxides. Furthermore, the capacity retention rate at 1 A/g current density is as high as 84.1% after ultralong 100,000 cycles. Due to the excellent performance of synthesized 3D nanoflower-like MXene/metal oxyhydroxide composites, it can be used for electrode materials fabrication with enhanced energy storage properties for supercapacitors to fulfill energy needs.

Enhanced energy storage properties of Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramics doped with BiFeO3

The structure and electrical properties of Ba0.85Ca0.15Zr0.1Ti0.9O3-xBiFeO3 ceramics (x = 0 %, 3 %, 8 % and 15 %) were investigated. The prepared samples show perovskite structure, and there is no detected second phase. The grain size of all ceramic samples doped with BiFeO3 is significantly reduced. The doped samples have obvious relaxation characteristics, showing obvious dispersion phase transition and frequency dispersion. The P-E curve becomes thin with the increase of doping amount, but it changes reversely under higher doping content. For sample with the doping amount of 8 %, a thin and long hysteresis loop is observed, and the sample has the best energy storage characteristics with the energy storage density of 0.57 J/cm3 and the energy storage efficiency of 91.3 %. This study provides a method to improve the energy storage density and efficiency of BCZT ceramics.

Enhanced energy storage properties of Ba0.85Ca0.15Zr0.1Ti0.9O3—8%BiFeO3 ceramics by doping of Mg ions and Ti ions

Enhanced energy storage properties of Ba0.85Ca0.15Zr0.1Ti0.9O3—8%BiFeO3 ceramics by doping of Mg ions and Ti ions

Enhanced energy storage properties and large electrostrictive effect of Bi0.35Na0.35Ba0.09Sr0.21Ti(1-x)(Al0.5Nb0.5)xO3 relaxor ceramics

Ferroelectric ceramics have good piezoelectric and ferroelectric properties and can be used for energy storage equipment and actuators. Nevertheless, current research on dielectric capacitors has only focused on the energy storage density, but ignored efficiency. Moreover, conventional piezoelectric materials have a large strain hysteresis. In this work, (Al0.5Nb0.5)4+ (AN) complex ions doped 0.7Bi0.5Na0.5TiO3-0.3Ba0.3Sr0.7TiO3 (BNBST) ceramics were prepared. Doping AN destroyed the long-range ordered ferroelectric domains and generated polar nano regions, resulting in a gradual thinning and inclination of polarization hysteresis loops and an increase in relaxor degree. For BNBST-3AN ceramics, a Wrec of 1.52 J/cm3 and a η of 92.1% were achieved at 150 kV/cm. Meanwhile, BNBST-3AN ceramics had good energy storage temperature stability and cycling performance. The AN doping reduced the strain hysteresis in BNBST ceramics. BNBST-2AN ceramics exhibited a longitudinal electrostrictive coefficient Q33 ∼ 0.0292 m4/C2 and a field-induced strain of 0.25% with low strain hysteresis (6.67%). Furthermore, BNBST-4AN ceramics had superior dielectric temperature stability from 24 to 270 °C. All results show that BNBST-100xAN ceramics have great promise for energy storage devices and actuators.

Carbon Quantum Dot Modified Reduced Graphene Oxide Framework for Improved Alkali Metal Ion Storage Performance

Organic materials with redox-active oxygen functional groups have attracted great attention as electrode materials for alkali-ion storage due to their earth-abundant constituents, structural tunability, and enhanced energy storage properties. Therefore, the development of advanced carbon nanostructures is highly desirable for improving the electrochemical performance of organic electrodes. While nanoscale carbon materials like carbon quantum dots (CQDs) have been identified as promising candidates for a variety of applications such as sensing, catalysis, drug delivery...etc., their utilization in electrochemical energy storage remains challenging with limited investigations. Herein, a hybrid carbon framework consisting of reduced graphene oxide (rGO) and carbon quantum dots is developed via a simple one-pot solvothermal reduction method, and a systematic study is conducted to investigate its redox mechanism and electrochemical properties with Li-, Na-, and K-ions. With the incorporation of carbon quantum dots, the hybrid rGO-CQD cathode exhibited much improved charge storage performance. In particular, the Li-ion cell delivered impressive reversible capacity (257 mAh g-1 at 50 mA g-1), rate capability (111 mAh g-1 at 1 A g-1) and cycling stability (79% capacity retention after 10,000 cycles). The charge storage behavior of various alkali-ions was also confirmed by density functional theory calculations. Furthermore, our calculations uncovered the CQD structure-electrochemical reactivity relationships, which could pave the way for the tailoring of CQD species to achieve optimal alkali-ion storage.

Highly enhanced energy storage properties of H2O2-hydroxylated rare earth ferrites (LaFeO3 and GdFeO3) nanofillers in poly(vinylidene fluoride)-based nanocomposite films

Highly enhanced energy storage properties of H2O2-hydroxylated rare earth ferrites (LaFeO3 and GdFeO3) nanofillers in poly(vinylidene fluoride)-based nanocomposite films

Carbon Quantum Dot Modified Reduced Graphene Oxide Framework for Improved Alkali Metal Ion Storage Performance.

Organic materials with redox-active oxygen functional groups are of great interest as electrode materials for alkali-ion storage due to their earth-abundant constituents, structural tunability, and enhanced energy storage properties. Herein, a hybrid carbon framework consisting of reduced graphene oxide and oxygen functionalized carbon quantum dots (CQDs) is developed via the one-pot solvothermal reduction method, and a systematic study is undertaken to investigate its redox mechanism and electrochemical properties with Li-, Na-, and K-ions. Due to the incorporation of CQDs, the hybrid cathode delivers consistent improvements in charge storage performance for the alkali-ions and impressive reversible capacity (257 mAh g-1 at 50mA g-1 ), rate capability (111 mAh g-1 at 1 A g-1 ), and cycling stability (79% retention after 10000 cycles) with Li-ion. Furthermore, density functional theory calculations uncover the CQD structure-electrochemical reactivity trends for different alkali-ion. The results provide important insights into adopting CQD species for optimal alkali-ion storage.

Enhanced energy storage properties under low electric fields in (Bi0.5Na0.5)TiO3-based relaxor ferroelectrics via a synergistic optimization strategy

Lead-free dielectric ceramics with high energy storage performance (ESP) are strongly desired for pulse power capacitor applications. However, low recoverable energy storage density (Wrec) under low electric fields seriously hinders their applications in miniatured and integrated electronic devices. In this work, we adopted a synergism strategy to develop (Bi0.5Na0.5)0.7Sr0.3Ti(1-x)(Al0.5Nb0.5)xO3 (BNST-xAN) ceramics with substantially enhanced low-field ESP through combining composition design and tape-casting approaches. Complex-ion substitution of (Al0.5Nb0.5)4+ for Ti4+ shifted the temperature of maximum dielectric constant towards room temperature direction, made relaxor behavior stronger and promoted formation of highly dynamic nanodomains, thus reducing the remanent polarization. Besides, refined submicron grains and improved densification behavior were achieved in those ceramics fabricated by tape casting, further increasing the breakdown strength. Consequently, a large Wrec of 4.30 J/cm3 was achieved at a low electric field of 230 kV/cm at x = 0.10, which is superior to previously reported lead-free energy storage ceramics under low electric fields. Moreover, our ceramics exhibited brilliant thermal endurance (20–140 °C) and frequency stability (0.2–200 Hz) together with fast discharge speed. These characteristics suggest the great potential of the BNST-0.10AN ceramic for low-field and high-performance energy storage capacitor applications.

Enhanced energy storage properties and dielectric stabilities in BNT-based ceramics via multiphase and dielectric peak broadening engineering

Recently, lead-free energy storage ceramics have attracted considerable research interests due to their fast charge/discharge rate, environmental friendliness and high-power density. However, there also exist the problems of low energy density (W) and poor charge-discharge efficiency (η) for most of lead-free ceramics. Herein, novel ceramics of (1-x)(Bi0.5Na0.5)0.94Ba0.06]TiO3-xLa[Zn2/3(Nb0.5Ta0.5)1/3]O3 (BNBT-xLZNT) have been developed and synthesised by an ordinary sintering technique, and their microstructures and electrical properties have been researched systematically. The tetragonal (T) and rhombohedral (R) phases coexist in the BNBT-xLZNT ceramics. After the doping of La[Zn2/3(Nb0.5Ta0.5)1/3]O3 (LZNT), the ferroelectric long-range order is effectively destroyed and the remanent polarization (Pr) of the materials is significantly reduced, leading to the shift of the shoulder dielectric peak at Ts towards room temperature and the broadening of the maximum dielectric peak at Tm. Consequently, the ceramic with x = 0.04 (BNBT-4LZNT) possesses the highest maximum polarization (Pmax) of 31.82 μC/cm2 and the lowest Pr of 2.57 μC/cm2. According to above advantages, the optimum effective energy storage density (Wrec) of 1.66 J/cm3 and η of 73.97% are gained under a relatively low dielectric breakdown strength (DBS) of 139 kV/cm. In addition, the BNBT-4LZNT ceramic exhibits excellent temperature (25–250 °C), frequency (1–100 Hz) and fatigue resistant stabilities (10-104 cycles). Our study indicates that the energy storage properties of BNT-based ceramics can be significantly enhanced via multiphase and dielectric peak broadening engineering.