Ultrathin poly(cyclocarbonate-ether)-based composite electrolyte reinforced with high-strength functional skeleton

作     者：Xiaojiao Zheng Da Xu Ning Fu Zhenglong Yang Xiaojiao Zheng;Da Xu;Ning Fu;Zhenglong Yang

作者机构：Shanghai Key Laboratory of D&A for Metal-Functional MaterialsSchool of Materials Science and EngineeringTongji UniversityShanghai 200092China School of Chemical and Environmental EngineeringAnyang Institute of TechnologyAnyang 455000HenanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第81卷第6期

页      面：603-612,I0013页

核心收录：

学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (52102198) the Key R&D and Promotion Projects of Henan Province (212102310016) the Initial Scientific Research Fund of Ph.D.in Anyang Institute of Technology (BSJ2021043) the Initial Scientific Research Fund of Postdoctor in Anyang Institute of Technology (BHJ2022008)。 

主　　题：Composite polymer electrolytes Polymer matrix 3D functional skeleton Plasticization Synergistic effect 

摘      要：Composite polymer electrolytes(CPEs)are considered to be the most promising to break through the performance and safety limitations of traditional lithium-ion batteries because of their excellent electrochemical and mechanical properties.Aiming at the performance limitations of the most common polyether matrix such as poly(ethylene oxide)(PEO),a novel poly(cyclocarbonate-ether)polymer matrix was prepared by in-situ thermal curing,the weaker interaction between its C=O bond and Li^(+)can promote the rapid transport of Li^(+).Adding ionic liquid and active filler LLZTO to the matrix can synergistically reduce the crystallinity of matrix and promote the dissociation of lithium salts.In addition,a 3D functional skeleton made of polyacrylonitrile(PAN)and lithium fluoride(LiF)can greatly improve the mechanical strength of polymer matrix after cold pressing,and Li F is also conducive to interface stability.The thickness of the optimal sample(VP6L/CPL)was only 25μm,and its ionic conductivity,lithium ion transference number,and electrochemical stability window were as high as 7.17×10^(-4)S cm^(-1)(25℃),0.54 and 5.4 V,respectively,while the mechanical strength reaches 6.1 MPa,which can fully inhibit the growth of lithium dendrites.The excellent electrochemical performance and mechanical strength enable the assembled Li|VP6L/CPL|Li battery to be continuously charged for over 200 h and cycled stably for more than 2300 h,and Li|VP6L/CPL|LFP battery can be stably cycled for more than 400 and 550 cycles at 1 C(40℃)and 0.5 C(25℃),respectively.