摘要
Recently,rechargeable zinc-ion batteries have been considered as the future development direction of large-scale energy storage due to their low price,safety,environmental friendliness,and excellent electrochemical performance.However,highcapacity,long-cycle stable cathode materials that can meet the demand are still to be developed.Herein,the hollow mesoporous ZnMn2O4/C microsphere cathode material with carbon nanotubes embedded in the shell was prepared by spray pyrolysis for the first time.Its capacity remained at 209.71 mAh·g−1 after 150 cycles at a rate of 0.5 A·g−1,and still maintained a specific capacity of 100.06 mAh·g−1 at a rate of 1 A·g−1 after 1,000 cycles.The outstanding performance is attributed to the hollow structure that can effectively buffer large volume changes caused by ion intercalation and deintercalation,excellent porosity,cationic defects,and high electrical conductivity of carbon nanotubes and its strong adsorption to ZnMn2O4 nanoparticles.
基金
This work was supported by the National Natural Science Foundation of China(Nos.21871005 and 22171005)
the University Synergy Innovation Program of Anhui Province(Nos.GXXT-2020-005,GXXT-2021-012,and GXXT-2021-013)
Open project of Shanghai Institute of Technical Physics(No.IIMOKFJJ-19-09).
