Abstract
Hollow nanostructures are extremely attractive in energy storage and show broad application prospects.But the preparation method is accompanied by a complicated process.In this article,the CoZn-based hol-low nanoboxes with electrochemical synergy are prepared in a simple way.This structure can effectively shorten the transmission distance of ions and electrons,and alleviate the volume expansion during the cycle.In particular,bimetallic oxides are rich in oxygen vacancies,providing more active sites for electro-chemical reactions.In addition,the stepwise oxidation-reduction reaction can also improve the volume change of the electrode material.According to the kinetic analysis and density functional theory(DFT)calculation,it is confirmed that the synergistic effect of the bimetallic oxide can accelerate the reaction kinetics.Based on these characteristics,the electrode exhibits stable cycle performance and long cycle life in alkali metal ion batteries,and can provide reversible capacities of 302.1(LIBs,2000 cycles),172.5(SIBs,10000 cycles)and 109.6(PIBs,5000 cycles)mA h g-1 at a current density of 1.0 A g-1,respectively.In ad-dition,by assembling(LiCoO2//CoZn-O2)and(Na3V2(PO4)3//CoZn-O2)full-cells,the practical application value is demonstrated.The sharing of this work introduces a simple way to synthesize hollow nanoboxes,and shows excellent electrochemical performance,which can also be expanded in other areas.
基金项目
National Natural Science Foun-dation of China(52072307)
analy-sis and testing center of northwestern polytechnical university for their technical assistance()
authors thank Beishide Instrument Technology Beijing)Co,Ltd for their BET technical assistance(3H-2000PS2)
NETL
NSTL
维普
万方数据