Polyethylene oxide(PEO)-based solid polymer electrolytes(SPEs)with flexibility,easy processability,low cost and especially strong ability to dissolve lithium salts have been regarded as promising alternatives to traditional flammable liquid electrolytes in next-generation high-safety and high-energy-density lithium metal batteries.However,the inferior mechanical strength and thermosta-bility of PEO-based SPEs will raise the lithium dendritic penetration issue,further leading to the short circuit in batteries.In this work,aiming at enhancing the interfacial stability against Li dendrites of PEO-based SPEs,poly(m-phenylene isophthalamide)(PMIA)is introduced as a reinforcing phase for the rational design of PEO/PMIA composite electrolyte.Impressively,PMIA chain with meta-type benzene-amide linkages significantly improves the mechanical strength(1.60 MPa),thermal stability(260℃)and ability to inhibit the growth of lithium den-drites(＞300 h at 0.1 mA·cm-2)of SPEs.Meanwhile,all-solid-state LiFePO4‖PEO/PMIA‖Li cell demonstrates superior electrochemical performance in terms of high specific capacity(159.1 mAh·g-1),remarkable capacity retention(82.2％after 200 cycles at 0.5C)and excellent safety characteristics.No burning or explosion occurs under pressing,bending and cutting conditions.This work opens a new door in developing high-performance PEO-based electrolytes for advanced all-solid-state lithium metal batteries.

Ya-Ning Liu;Zhen Xiao;Wen-Kui Zhang;Jun Zhang;Hui Huang;Yong-Ping Gan;Xin-Ping He;G.Gnana Kumar;Yang Xia

College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Institute of Optoelectronic Materials and Devices,China Jiliang University,Hangzhou 310018,China;Department of Physical Chemistry,School of Chemistry,Madurai Kamaraj University,Madurai 625021,India

稀有金属（英文版）

[1]Ya-Ning Liu;Zhen Xiao;Wen-Kui Zhang;Jun Zhang;Hui Huang;Yong-Ping Gan;Xin-Ping He;G.Gnana Kumar;Yang Xia-.Poly(m-phenylene isophthalamide)-reinforced polyethylene oxide composite electrolyte with high mechanical strength and thermostability for all-solid-state lithium metal batteries)[J].稀有金属（英文版）,2022(11):3762-3773

isophthalamide,thermosta

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