Agitation drying synthesis of porous carbon supported Li <sub>3</sub> VO <sub>4</sub> as advanced anode material for lithium‐ion batteries
Wenwen Gou, Shuang Zhou, Xinxin Cao, Yilin Luo, Xiangzhong Kong, Jing Chen, Xuefang Xie, Anqiang Pan
Abstract
Abstract Li 3 VO 4 has been considered as a promising insertion‐type anode for lithium‐ion batteries due to its high theoretical specific capacity and suitable operating voltage platform. However, this promising anode still suffers from poor electrical conductivity. To address this issue, herein, a porous carbon supported Li 3 VO 4 composites (Li 3 VO 4 /C) via a facile agitation‐drying method combined with subsequent calcination is reported, in which Ketjen black carbon with high porosity, easy dispersion and excellent conductivity can serve as one of carbon sources. The Li 3 VO 4 /C composite prepared at 700 °C with a carbon content of ~ 10% exhibits the optimized structure. The void space of the composite accommodates the volume changes during the charge/discharge process. Meanwhile, the carbon shell serves as a conductive skeleton to provide bi‐continuous Li ions and electrons pathways. Electrochemical results reveal that the composite delivers a high initial discharge capacity of 572 mAh·g −1 and maintains a capacity of 442.9 mAh·g −1 after 100 cycles at 100 mA·g −1 . Even at a high current density of 2 A·g −1 , a considerable capacity of 243.8 mAh·g −1 can still be obtained. This work provides a promising approach for the practical application of Li 3 VO 4 as anode material for LIBs.