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

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 1; no. 21; pp. 11488 - 11497
• Main Authors: Li, Daobo, Lu, Junlin, Zhang, Dongmei, Pei, Cunyuan, Xiao, Ting, Ma, Huijian, Ni, Shibing
• Format: Journal Article
• Published: 31.05.2022
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d2ta02872g

The high-rate Li-ion storage of Li 3 VO 4 -based electrodes has been hindered by unsatisfactory reaction kinetics caused by specific challenge in morphology and structure regulation. Self-supported Li 3 VO 4 /N doped C fibers (SS LVO/NC NFs) with foldability and the specific architecture of LVO nanoparticles embedded homogeneously in interlaced NC fibers are designed for the first time via a modified electrospinning approach. The morphological merits of the LVO/NC NFs and the structural merits of the integral electrode are well integrated in the SS LVO/NC NFs, resulting in continuously excellent reaction kinetics and superb high-rate performance. After 850 cycles of repeated rate performance testing from 0.5 to 5 A g −1 , the discharge capacity could restore to 592.3 mA h g −1 when directly reverting the current back to 0.5 A g −1 . When gradually reducing the current from 5 to 0.5 A g −1 , the SS LVO/NC NFs could deliver a high discharge capacity of 553.2 mA h g −1 after repeated rate performance testing from 5 to 0.5 A g −1 over 820 cycles. When simulating the practical application under a high charge/discharge current of 4/6 A g −1 , the SS LVO/NC NFs could still deliver a high discharge capacity of 230.4 mA h g −1 after 8000 cycles. The excellent performance and the foldability of the SS LVO/NC NFs endow it with potential application in wearable devices. Flexible and self-supported Li 3 VO 4 /N doped C electrode was firstly prepared via an improved electrospinning approach, showing outstanding high-rate performance and ultra-long lifespan.