Nanophase separated,grafted alternate copolymer styrene-maleic anhydride as an efficient room temperature solid state lithium ion conductor

Qian Wang ¹Ting Gao ²Xiwen Lu ²Hangchao Wang ²Minggui Xu ²Longtao Ren ²Zheng Chang ²Wen Liu²

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作者信息

1. Institute of Science and Technology,China Three Gorges Corporation,Beijing 100038,China
2. State Key Laboratory of Chemical Resource Engineering,Beijing Advanced Innovation Center for Soft Matter Science and Engineering,College of Chemistry,Beijing University of Chemical Technology,Beijing 100029,China
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Abstract

All solid-state lithium metal batteries(ASSLMBs)based on polymer solid electrolyte and lithium metal anode have attracted much attention due to their high energy density and intrinsic safety.However,the low ionic conductivity at room temperature and poor mechanical properties of the solid polymer elec-trolyte result in increased polarization and poor cycling stability of the Li metal batteries.In order to improve the ionic conductivity at room temperature while maintaining mechanical strength,we com-bine the conductivity of short chain polyethylene oxide(PEO)and strength of styrene-maleic anhydride copolymer(SMA)to obtain a grafted block copolymer with nanophase separation structure,which has room temperature ionic conductivity up to 1.14×10-4 S/cm and tensile strength up to 1.4 MPa.Li||Li symmetric cell can work stably for more than 1500h under the condition of 0.1mA/cm2.Li||LiFePO4 full cells can deliver a high capacity of 151.4 mAh/g at 25℃ and 0.2 C/0.2 C charge/discharge condi-tions,showing 85.6% capacity retention after 400 cycles.Importantly,the all solid state Li||LiFePO4 pouch cell shows excellent safety performance under different abuse conditions.These results demonstrate that the nanophase separated,grafted alternate copolymer electrolyte has huge potential for application in Li metal batteries.

Key words

Solid polymer electrolyte/All solid-state battery/Li metal battery/Copolymers/Nanophase separation

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基金项目

National Natural Science Foundation of China(21771018)

National Natural Science Foundation of China(21875004)

National Natural Science Foundation of China(22108149)

Beijing University of Chemical Technology(buctrc201901)

Beijing Municipal Natural Science Foundation-Xiaomi Innovation Joint Fund(L223011)

program"Research on key technologies of solidstate batteriesresearch and development of organicinorganic composite solidstat(202103036)

出版年

2024

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

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