Carbon coated Li3VO4 microsphere: Ultrafast solvothermal synthesis and excellent performance as lithium-ion battery anode

Pei

ACS Appl. Mater. Interfaces

et al. 2022

While the comprehensive merits of high safety and high capacity make Li3VO4 (LVO) a potential anode material for lithium-ion batteries, the practical application of LVO was severely impeded by the unfavorable high-rate capability and unscalable preparation. Here, LVO/N doped C nanosheets (LVO@NC NSs) assembled from primary LVO@NC nanoparticles are prepared via a scalable and concise spray drying approach. The 2D morphology and the interconnected LVO@NC constituents endow the LVO@NC NSs with continuously excellent reaction activity, leading to prominent rate performance. When cycling at 0.2 A g–1, the obtained LVO@NC NSs exhibit a high charge capacity of 628.4 mAh g–1 after 300 cycles, showing little improvement compared with the initial charge capacity. After 9 periods of rate testing ranging from 0.1 to 6.0 A g–1 for 460 cycles, a high charge capacity of 610.3 mAh g–1 remains. It also exhibits an outstanding long lifespan at the charge/discharge currents of 3.0/6.0 A g–1, delivering a high charge capacity of 277.0 mAh g–1 in the 5000th cycle. The scalable and concise preparation as well as the enhanced high-rate capability of the LVO@NC NSs make them hold great promise as an anode candidate for high-power lithium-ion storage devices.

Section: Resultsmentioning

confidence: 99%

Hierarchical Self-Assembly Strategy for Scalable Synthesis of Li₃VO₄/N Doped C Nanosheets for High-Rate Li-Ion Storage

Pei

ACS Appl. Mater. Interfaces

et al. 2022

“…It is approximately 10 times larger than that of V 2 O 3 @C (2.2 × 10 –15 cm 2 s –1 ). The higher D Li + value of the V 2 O 3 @C/rGO electrode is conducive to faster Li + ion diffusion and also explicates the outstanding lithium storage performance. − The GITT technique is also applied to test the Li + diffusion coefficient. As shown in Figure S11, the average D Li + values of V 2 O 3 @C/rGO and V 2 O 3 @C are about 2.1 × 1 0 –14 and 1.9 × 10 –15 cm 2 s –1 , respectively, in agreement with the result counted from data fitting in the Warburg range.…”

Section: Resultsmentioning

confidence: 99%

Facilely Fabricating V₂O₃@C Nanosheets Grown on rGO as High-Performance Negative Materials for Lithium-Ion Batteries by Adjusting Surface Tension

Zhao

Zheng

et al. 2022

Ind. Eng. Chem. Res.

Self Cite

The flourish of insertion reaction-type V 2 O 3 negative materials with large reversible capacity and outstanding rate performance is facing a huge trouble. In this study, we have successfully prepared a V 2 O 3 @C/rGO composite by adjusting surface tension. The small V 2 O 3 @C nanosheets are fastened to reduced graphene oxide, which remarkably elevates the electron and lithium ion transfer rate. More importantly, the obvious interaction between V 2 O 3 and reduced graphene oxide is beneficial for faster charge transfer. The above features of the V 2 O 3 @C/rGO composite are responsible for obtaining larger reversible capacity and superior rate capability. When applied to lithium-ion batteries as a negative material, it delivers a large reversible discharge capacity of 754 mA h g −1 at the 100th cycle under 100 mA g −1 , although under 2000 mA g −1 , V 2 O 3 @C/rGO still can give a large capacity of 409 mA h g −1 . This study would shed novel light on the preparation of 2D materials and the efficient application of insertion reaction-type materials.

ACS Appl. Mater. Interfaces

“…1−5 For LIBs, the commercial graphite delivers a limited capacity of 372 mA h g −1 , which still cannot satisfy the demand for high energy density application in the future. 6,7 Silicon has the highest theoretical capacity (4200 mA h g −1 ), which is promising as an alternative for achieving high energy density. However, silicon suffers from a drastic volume change (∼400%), which diminishes large capacity and pulverizes the particles, resulting in low Coulombic efficiency and rapid capacity loss.…”

Section: Introductionmentioning

confidence: 99%

“…Developing the next-generation energy storage systems is of great significance for energy sustainability and cutting-edge technology. Rechargeable lithium-ion batteries (LIBs) have attracted great attention in the past two decades due to their unique advantages, such as high energy density and long cycling life. − For LIBs, the commercial graphite delivers a limited capacity of 372 mA h g –1 , which still cannot satisfy the demand for high energy density application in the future. , Silicon has the highest theoretical capacity (4200 mA h g –1 ), which is promising as an alternative for achieving high energy density. However, silicon suffers from a drastic volume change (∼400%), which diminishes large capacity and pulverizes the particles, resulting in low Coulombic efficiency and rapid capacity loss. − Transition-metal oxides have recently been considered to be a new class of electrode materials from the viewpoint of high theoretical capacity, low cost, and natural abundance. − Nevertheless, for the majority of transition-metal oxides, their low electronic conductivity can yield a large polarization, inferior rate capability, and large volume changes, resulting in cycling instability and posing serious challenges for developing the next-generation energy storage systems.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of VO Nanorings on a Porous Carbon Architecture for High-Performance Li-Ion Batteries

Liu

et al. 2022

Self Cite

Vanadium monoxide (VO) is a promising candidate as an anode for lithium-ion batteries due to its high theoretical capacity, low cost, and considerable electronic conductivity. Unfortunately, a large volume change during electrochemical processes obstructs its practical application. In this work, a composite of VO nanorings grown on a porous carbon architecture is prepared via a topochemical self-reduction approach. When used as an anode for lithium-ion batteries, improved redox kinetics from enhanced electronic conduction and the corresponding fast lithium-ion diffusion is observed to greatly promote the electrochemical performance of lithium-ion batteries. The resulting composite delivered a reversible capacity of 336 mA h g −1 after 400 cycles at 10 A g −1 with a capacity retention of 85%, owing to the synergistic effect of VO nanorings and porous carbon in alleviating volume changes that result in a long-term cycling ability at a high current density. At 20 A g −1 , the composite anode exhibited a rate capability of 235 mA h g −1 , superior to all VO-based electrodes reported in the literature. Furthermore, a full cell was first fabricated by employing VO@C-2 as the anode and LiFePO 4 as the cathode, which exhibited a capacity of 213 mA h g −1 after 100 cycles at 0.1 A g −1 , indicating the potential of VO as an anode for practical application.