Abstract
Covalent organic frameworks(COFs)exhibiting reversible redox behaviors have been identified as promis-ing candidates for constructing electrode materials in lithium-ion batteries(LIBs).However,their exten-sive application has been limited due to finite redox sites and poor structural stability.In this study,we design and synthesize a novel polyimide covalent organic framework(PI-COF)using the traditional solvothermal method and successfully apply it as an anode material for LIBs.The large conjugated struc-ture of PI-COF accelerates charge transfer,while its large surface area provides more active sites,making PI-COF an attractive anode material for LIBs.Furthermore,the PI-COF anode material demonstrates high reversible specific capacity and excellent long-term cycling stability due to its COF characteristics.Specif-ically,the PI-COF electrodes deliver a specific capacity of 800 mAh/g at a current density of 200mA/g after 200 cycles,while a specific capacity of 450 mAh/g at a current density of 1000 mA/g is sustained after 800 cycles.The outstanding lithium storage capacity,particularly the satisfactory long-term cycling stability,establishes PI-COF as a promising material for LIBs.
基金项目
National Natural Science Foundation of China for Youths(21701059)
National Natural Science Foundation of China for Youths(22205084)
National Natural Science Foundation of China for Youths(51902140)
Natural Science Foundation of Jiangsu Province for Youths(BK20170571)
Shandong Key Laboratory of Biochemical Analysis(SKLBA2103)
NETL
NSTL
万方数据