首页|A high-flash-point quasi-solid polymer electrolyte for stable nickel-rich lithium metal batteries

A high-flash-point quasi-solid polymer electrolyte for stable nickel-rich lithium metal batteries

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In the exploration of next-generation high-energy-density batteries,lithium metal is regarded as an ideal candidate for anode materials.However,lithium metal batteries(LMBs)face challenges in practical appli-cations due to the risks associated with organic liquid electrolytes,among which their low flash points are one of the major safety concerns.The adoption of high flash point quasi-solid polymer electrolytes(QSPE)that is compatible with the lithium metal anode and high-voltage cathode is therefore a promising strategy for exploring high-performance and high-safety LMBs.Herein,we employed the in-situ polymer-ization of poly(epoxidized soya fatty acid Bu esters-isooctyl acrylate-ditrimethylolpropane tetraacrylate)(PEID)to gel the liquid electrolyte that formed a PEID-based QSPE(PEID-QSPE).The flash point of PEID-QSPE rises from 25 to 82 ℃ after gelation,contributing to enhanced safety of the battery at elevated tem-peratures,whereas the electrochemical window increases to 4.9 V.Moreover,the three-dimensional polymer framework of PEID-QSPE is validated to facilitate the uniform growth of the solid electrolyte interphase on the anode,thereby improving the cycling stability of the battery.By employing PEID-QSPE,the Li|LiNi0.9Co0.05Mn0.05O2 cell achieved long-term cycling stability(Coulombic efficiency,99.8％;＞200 cycles at 0.1 C)even with a high cathode loading(～5 mg cm-2)and an ultrathin Li(～50 μm).This electrolyte is expected to afford inspiring insights for the development of safe and long-term cyclability LMBs.

Solid-state batteriesLithium metal anodesQuasi-solid polymer electrolytesHigh flash pointsCross-linking polymerization

Yu-Kun Liu、Xue-Yan Huang、Jun-Dong Zhang、Wei-Jin Kong、Juan Du、Ximin Zhai、Xiaofe Bie、Huanli Sun、Hao Zhang、Chong Yan、Xuechun Hao、Lizhen Fan、Ai-Bing Chen、Chen-Zi Zhao

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College of Chemical and Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China

Tsinghua Center for Green Chemical Engineering Electrification,Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China

China FAW Corporation Limited,Chuangchun 130013,Jilin,China

Beijing Key Laboratory of Advanced Chemical Energy Storage Technologies and Materials,Research Institute of Chemical Defense,Beijing 100191,China

Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China

School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China

Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,Shanxi,China

Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China

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2024

10.1016/j.jechem.2024.07.043

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.99(12)