Substituting liquid electrolytes with solid elec-trolytes is considered as an important strategy to solve the problem of flammability and explosion for traditional lithium-ion batteries(LIB).However,neither inorganic solid electrolytes(ISE)nor solid polymer electrolytes(SPE)alone can meet the operating requirements for room-temperature(RT)all-solid-state lithium metal batteries(ASSLMB).Here,we report a three-dimensional(3D)nanofiber framework reinforced polyethylene oxide(PEO)-based composite polymer electrolytes(CPE)through con-structing a nanofiber framework combining polyacryloni-trile(PAN)and fast Li-ion conductor Li0.33La0.557TiO3(LLTO)framework by electrospinning method.Mean-while,the PEO electrolyte filled in the pores of the PAN/LLTO nanofiber framework can effectively isolate the direct contact between the chemically active Ti4+in LLTO with lithium metal,thereby avoiding the occurrence of interfacial reactions.Enhanced electrochemical stability makes a wide electrochemical window up to 4.8 V with an ionic conductivity of about 9.87 x 10-5 S·cm-1 at RT.Benefiting from the excellent lithium dendrite growth inhibition ability of 3D PAN/LLTO nanofiber framework,especially when the mass of LLTO reaches twice that of the PAN,Li/Li symmetric cell could cycle stably for 1000 h without a short circuit.In addition,under 30℃,the LiFePO4/Li ASSLMB using such CPE delivers large capacities of 156.2 and 140 mAh·g-1 at 0.2C and 0.5C,respectively.These results provide a new insight for the development of the next generation of safe,high-perfor-mance ASSLMBs.

Tian-Qi Yang;Cheng Wang;Wen-Kui Zhang;Yang Xia;Yong-Ping Gan;Hui Huang;Xin-Ping He;Jun Zhang

College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China

稀有金属（英文版）

[1]Tian-Qi Yang;Cheng Wang;Wen-Kui Zhang;Yang Xia;Yong-Ping Gan;Hui Huang;Xin-Ping He;Jun Zhang-.Composite polymer electrolytes reinforced by a three-dimensional polyacrylonitrile/Li0.33La0.557TiO3 nanofiber framework for room-temperature dendrite-free all-solid-state lithium metal battery)[J].稀有金属（英文版）,2022(06):1870-1879

557TiO3,Substituting,ASSLMB,polyacryloni,Ti4+in,ASSLMBs

Composite,polymer,electrolytes,reinforced,three,dimensional,polyacrylonitrile,Li0,33La0,nanofiber,framework,room,temperature,dendrite,free,solid,state,lithium,metal,battery,liquid,considered,important,strategy,solve,problem,flammability,explosion,traditional,batteries,LIB,However,neither,inorganic,ISE,SPE,alone,can,meet,operating,requirements,Here,report,polyethylene,oxide,PEO,composite,CPE,through,structing,combining,PAN,fast,conductor,LLTO,electrospinning,method,Mean,while,filled,pores,effectively,isolate,direct,contact,between,chemically,active,thereby,avoiding,occurrence,interfacial,reactions,Enhanced,electrochemical,stability,makes,wide,window,up,ionic,conductivity,about,Benefiting,from,excellent,growth,inhibition,especially,when,mass,reaches,twice,that,symmetric,could,cycle,stably,without,short,circuit,In,addition,under,LiFePO4,using,such,delivers,large,capacities,mAh,2C,5C,respectively,These,results,provide,new,insight,development,next,generation,safe,high,perfor,mance

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