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

Sodium-ion battery Carbon fibers
DOI: 10.1021/acsami.1c16035 Publication Date: 2021-11-09T21:52:10Z
ABSTRACT
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.
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