Flexible lithium metal capacitors enabled by an in situ prepared gel polymer electrolyte  

作　　者：Qizhi Zhong Bao Liu Bingjun Yang Yali Li Junshuai Li Xingbin Yan 

机构地区：[1]Key Laboratoy of Special Function Materials Structure Design of the Ministry of Education,and School of Materials&Energy,Lanzhou University,Lanzhou 730000,China [2]Laboratory of Clean Energy Chemistry and Materials,State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Chinese Chemical Letters》2021年第11期3496-3500,共5页中国化学快报（英文版）

基　　金：the financial support from the Natural Science Foundation of Gansu(No.20JR10RA611);the Fundamental Research Funds for the Central Universities(Nos.Lzujbky-2017-178 and lzujbky-2017-181).

摘　　要：The rapid development of next-generation flexible electronics stimulates the growing demand for flexible and wearable power sources with high energy density.Li metal capacitor(LMC),combining with a Li metal anode and an activated carbon cathode,exhibits extremely high energy density and high power density due to the unique energy storage mechanism,thus showing great potential for powering wearable electronic devices.Herein,a flexible LMC based on an in situ prepared PETEA-based gel polymer electrolyte(GPE)was reported for the first time.Owing to the high ionic conductivity of PETEA-based GPE(5.75×10^(−3)S/cm at 20℃),the assembled flexible LMC delivers a high capacitance of 210 F/g at 0.1 A/g within the voltage range from 1.5 V to 4.3 V vs.Li/Li^(+),a high energy density of 474 Wh/kg at 0.1 A/g and a high power density of 29 kW/kg at 10 A/g.More importantly,PETEA-based GPE endows the LMC with excellent flexibility and safety,which could work normally under abuse tests,such as bending,nail penetration and cutting.The in situ prepared PETEA-based GPE simplifies the fabrication process,avoids the risk of leakage and inhibits the growth of Li dendrite,making LMC a promising flexible energy storage device for the flexible electronic field.

关 键 词：Lithium metal capacitor In situ prepared gel polymer electrolyte FLEXIBLE Energy density Power density 

分 类 号：TM53[电气工程—电器] TQ317[化学工程—高聚物工业]