Core–Shell Co2VO4/Carbon Composite Anode for Highly Stable and Fast-Charging Sodium-Ion Batteries

• DOI: 10.1021/acsami.1c16035
• Publication Date: 2021-11-09T21:52:10Z
• Authors: Cong Wang; Zhenyu Wang; Decheng Zhao; Jinghui Ren; Shupei Liu; Hao Tang; Peng Xu; Fei Gao; Xiangan Yue; Han Yang; Chunming Niu; Weishen Chu; Di Wang; Xiang Liu; Zhoulu Wang; Yutong Wu; Yi Zhang
• Keywords: Sodium-ion battery; Carbon fibers

Sodium-ion batteries (SIBs) are promising candidates for large-scale energy storage systems due to the abundance and wide distribution of sodium resources. Various solutions have been successfully applied revolve large-ion-size-induced battery issues at mid-to-low current density range. However, fast-charging properties SIBs still in high demand accommodate increasing needs large grid scales. Herein, a core-shell Co2VO4/carbon composite anode is designed tackle problem SIBs. The synergetic effect from stable spinel structure Co2VO4, size nanospheres, carbon shell provide enhanced Na+ ion diffusion electron transfer rates outstanding electrochemical performance. With an ultrahigh 5 A g-1, Co2VO4@C achieved capacity 135.1 mAh g-1 >98% retention after 2000 cycles through pseudocapacitive dominant process. This study provides insights SIB material design other such as lithium-ion batteries.