Polymer dispersed ionic liquid electrolytes with high ionic conductivity for ultrastable solid-state lithium batteries  

作　　者：Shengyu Qin Yaping Cao Jianying Zhang Yunxiao Ren Chang Sun Shuoning Zhang Lanying Zhang Wei Hu Meina Yu Huai Yang 

机构地区：[1]School of Materials Science and Engineering,Beijing Advanced Innovation Center for Materials Genome Engineering,Peking University,Beijing,People's Republic of China [2]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing,People's Republic of China [3]Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,Peking University,Beijing,People's Republic of China

出　　处：《Carbon Energy》2023年第5期115-126,共12页碳能源（英文）

基　　金：supported by the National Key R&D Program of China (2020YFE0100200);the National Natural Science Foundation of China (Grant Nos.51921002,51927806).

摘　　要：Solid polymer electrolytes(SPEs)have emerged as one of the most promising candidates for building solid-state lithium batteries due to their excellent flexibility,scalability,and interfacial compatibility with electrodes.However,the low ionic conductivity and poor cyclic stability of SPEs do not meet the requirements for practical applications of lithium batteries.Here,a novel polymer dispersed ionic liquid-based solid polymer electrolyte(PDIL-SPE)is fabricated using the in situ polymerization-induced phase separation(PIPS)method.The as-prepared PDIL-SPE possesses both outstanding ionic conductivity(0.74 mS cm^(-1) at 25℃)and a wide electrochemical window(up to 4.86 V),and the formed unique three-dimensional(3D)co-continuous structure of polymer matrix and ionic liquid in PDIL-SPE can promote the transport of lithium ions.Also,the 3D co-continuous structure of PDIL-SPE effectively accommodates the severe volume expansion for prolonged lithium plating and stripping processes over 1000 h at 0.5 mA cm^(-2) under 25℃.Moreover,the LiFePO_(4)//Li coin cell can work stably over 150 cycles at a 1 C rate under room temperature with a capacity retention of 90.6%from 111.1 to 100.7 mAh g^(-1).The PDIL-SPE composite is a promising material system for enabling the ultrastable operation of solid-state lithium-metal batteries.

关 键 词：high ionic conductivity lithium batteries solid polymer electrolytes solid-state batteries 

分 类 号：O646[理学—物理化学] TM912[理学—化学]