Deep Insight into Electrochemical Kinetics of Cowpea‐Like Li₃VO₄@C Nanowires as High‐Rate Anode Materials for Lithium‐Ion Batteries

Abstract

Owing to the high theoretical capacity (394 mAh g−1) and appropriate lithiation voltage (0.5–1.0 V vs Li+/Li), Li3VO4 is highly regarded as an attractive anode candidate for high‐safety lithium‐ion batteries. However, its high‐rate performance is seriously restricted by the sluggish electrode kinetics. To address these problems, we synthesize cowpea‐like Li3VO4@C nanowires through a facile electrospinning method. In this well‐designed structure, Li3VO4 nanocrystals are uniformly encapsulated in conductive carbon nanofibers just like peas in their pods. The 1D morphology with high electronic conductivity can afford high Li+ ions diffusion rate and fast surface charge storage mechanism, leading to significantly enhanced electrochemical kinetics. Even after 1000 cycles at 2 A g−1, the reversible capacity of cowpea‐like Li3VO4@C nanowires can be maintained at 318.0 mAh g−1 without obvious capacity decay.

Boosting high-rate lithium storage in Li3VO4via a honeycomb structure design and electrochemical reconstruction

“…5d). 67–71 As shown in Fig. 5e and f, the capacitive contribution of the LVO/C Hs electrode at each scan rate is highest among the electrodes.…”

“…5d). [67][68][69][70][71] As shown in Fig. 5e and f, the capacitive Table 1 The summarization of the long-life performance of various LVO-based electrodes at high currents above 1 A g −1…”

Self-supported Li3VO4/N doped C fibers for superb high-rate and long-life Li-ion storage

“…S10 †). 22,44 As shown in Fig. 6g, a high b value of $0.9 is maintained under different cycles, suggesting a capacitance dominated charge storage process.…”

“…Constructing a self-supported Li 3 VO 4 /C nanober electrode is promising to combine the merits of the local morphology (i.e., the improved reaction kinetics) and integral structure (i.e., the enhanced stability) more sufficiently, triggering better high-rate and long-life Li-ion storage. 19,[22][23][24][25] However, restricted by the compatibility between the polymer which is crucial for the exibility of the electrode and the rigorous conditions for the formation of Li 3 VO 4 , no report on freestanding Li 3 VO 4 /C electrodes has been reported up to now.…”

“…, the enhanced stability) more sufficiently, triggering better high-rate and long-life Li-ion storage. 19,22–25 However, restricted by the compatibility between the polymer which is crucial for the flexibility of the electrode and the rigorous conditions for the formation of Li 3 VO 4 , no report on freestanding Li 3 VO 4 /C electrodes has been reported up to now.…”