Quasi-Solid-State Composite Electrolytes with Multifunctional 2D Molecular Brush Fillers for Long-Cycling Lithium Metal Batteries  

作　　者：Yin Cui Guofang Yu Ruliang Liu Dongtian Miao Dingcai Wu 

机构地区：[1]PCFM Lab,School of Chemistry,Sun Yat-sen University,Guangzhou,Guangdong,510006 China [2]School of Chemistry and Materials Science,Guangdong University of Education,Guangzhou,Guangdong,510303 China

出　　处：《Chinese Journal of Chemistry》2023年第21期2848-2854,共7页中国化学（英文版）

基　　金：This work was supported by the projects of National Key Research and Development Program of China(2021YFF0500600);National Natural Science Foundation of China(51925308);Fundamental Research Funds for the Central Universities,Sun Yat-sen University(23yxqntdo02);Natural Science Foundation of Guangdong Province(2023A1515030160,2022A1515011778).

摘　　要：The ever-growing demand for next-generation high-energy-density devices drives the development of lithium metal batteries with enough safety and high performance,in which quasi-solid-state composite electrolytes(QSCEs)with high ionic conductivity and lithium ion transference number(urn:x-wiley:1001604X:media:cjoc202300232:cjoc202300232-math-0001)are highly desirable.Herein,we successfully synthesize a kind of two-dimensional(2D)molecular brush(GO-g-PFIL)via grafting poly(ionic liquid)side-chain(poly(3-(3,3,4,4,4-pentafluorobutyl)-1-vinyl-1H-imidazol-3-ium bis(trifluoromethanesulfonyl)imide),denoted as PFIL)on the surface of 2D graphene oxide(GO)sheet.GO-g-PFIL is used as multifunctional filler to prepare novel composite membranes and corresponding QSCEs(e.g.,QSCE-PH/GPFIL3/P).The as-obtained QSCE-PH/GPFIL3/P integrates features of PFIL side-chain-enhanced lithium ion conduction,poly(vinylidene fluoride-co-hexafluoropropene)backbone-induced flexibility,and GO-strengthened mechanical property.As a result,our ultrathin(21μm)self-supporting QSCE-PH/GPFIL3/P exhibits high ionic conductivity(3.24×10^(−4)S·cm^(−1))and excellent urn:x-wiley:1001604X:media:cjoc202300232:cjoc202300232-math-0002(0.82)at room temperature,and Li/LFP full cell with QSCE-PH/GPFIL3/P shows superior rate performance(high specific capacities of 79 mAh·g^(−1)at 30°C and 5 C)and excellent cycling performance(high capacity retention of 91%after 500 cycles at 80°C and 1 C).

关 键 词：Quasi-solid-state composite electrolyte I Filler 2D molecular brush Lithium metal battery Poly(ionic liquid) 

分 类 号：TQ317[化学工程—高聚物工业] TM912[电气工程—电力电子与电力传动]