Stress release in high-capacity flexible lithium-ion batteries through nested wrinkle texturing of graphene  

作　　者：Jing Chen Lei Wen Ruopian Fang Da-Wei Wang Hui-Ming Cheng Feng Li 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026.Anhui,China [3]School of Chemical Engineering,The University of New South Wales,Sydney 2052,Australia [4]Tsinghua-Berkeley Shenzhen Institute,Tsinghua University,Shenzhen 518055,Guangdong,China

出　　处：《Journal of Energy Chemistry》2021年第10期243-249,I0008,共8页能源化学（英文版）

基　　金：financial support from the National Natural Science Foundation of China(Nos.52020105010,51927803,51525206);the National Key R&D Program of China(2016YFA0200102 and 2016YFB0100100);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA22010602);the LiaoNing Revitalization Talents Program(No.XLYC1908015)。

摘　　要：Flexible lithium-ion batteries(LIBs)are critical for the development of next-generation smart electronics.Conversion reaction-based electrodes have been considered promising to construct high energy-density flexible LIBs,which satisfy the ever-increasing demand for practical use.However,these electrodes suffer from inferior lithium-storage performance and structural instability during deformation and long-term lithiation/delithiation.These are caused by the sluggish reaction kinetics of active-materials and the superposition of responsive strains originating from the large lithiation-induced stress and applied stress.Here,we propose a stress-release strategy through elastic responses of nested wrinkle texturing of graphene,to achieve high deformability while maintaining structural integrity upon prolonged cycles within high-capacity electrodes.The wrinkles endow the electrode with a robust and flexible network for effective stress release.The resulting electrode shows large reversible stretchability,along with excellent electrochemical performance including high specific capacity,high-rate capability and long-term cycling stability.This strategy offers a new way to obtain high-performance flexible electrodes and can be extended to other energy-storage devices.

关 键 词：Wrinkling graphene Structural design Stress release High-capacity active material Flexible electrodes 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工]