首页|Dual-salt poly(tetrahydrofuran)electrolyte enables quasi-solid-state lithium metal batteries to operate at-30 ℃

Dual-salt poly(tetrahydrofuran)electrolyte enables quasi-solid-state lithium metal batteries to operate at-30 ℃

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The stable operation of solid-state lithium metal batteries at low temperatures is plagued by severe restrictions from inferior electrolyte-electrode interface compatibility and increased energy barrier for Li+migration.Herein,we prepare a dual-salt poly(tetrahydrofuran)-based electrolyte consisting of lithium hexafluorophosphate and lithium difluoro(oxalato)borate(LiDFOB).The Li-salt anions(DFOB-)not only accelerate the ring-opening polymerization of tetrahydrofuran,but also promote the formation of highly ion-conductive and sustainable interphases on Li metal anodes without sacrificing the Li+con-ductivity of electrolytes,which is favorable for Li+transport kinetics at low temperatures.Applications of this polymer electrolyte in Li||LiFePO4 cells show 82.3％capacity retention over 1000 cycles at 30 ℃ and endow stable discharge capacity at-30 ℃.Remarkably,the Li||LiFePO4 cells retain 52％of their room-temperature capacity at-20 ℃ and 0.1 C.This rational design of dual-salt polymer-based electrolytes may provide a new perspective for the stable operation of quasi-solid-state batteries at low temperatures.

Poly(tetrahydrofuran)Dual-salt electrolyteSolid electrolyte interphaseLow-temperature operationQuasi-solid-state battery

Zhiyong Li、Zhuo Li、Rui Yu、Xin Guo

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School of Materials Science and Engineering,State Key Laboratory of Material Processing and Die & Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China

The State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

funding from the Natural Science Foundation of Hubei Province,ChinaNatural Science Foundation of China

2022CFA03122309056

2024

10.1016/j.jechem.2024.04.044

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)：2024.96(9)