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

作　　者：Zhiyong Li Zhuo Li Rui Yu Xin Guo 

机构地区：[1]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 [2]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

出　　处：《Journal of Energy Chemistry》2024年第9期456-463,共8页能源化学（英文版）

基　　金：funding from the Natural Science Foundation of Hubei Province,China(Grant No.2022CFA031);supported by the Natural Science Foundation of China(Grant No.22309056).

摘　　要：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^(+)conductivity of electrolytes,which is favorable for Li^(+)transport kinetics at low temperatures.Applications of this polymer electrolyte in Li||LiFePO_(4)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.

关 键 词：Poly(tetrahydrofuran) Dual-salt electrolyte Solidel ectrolyte interphase Low-temperature operation Quasi-solid-state battery 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]