丁二腈增塑氟化聚碳酸酯基固态电解质用于4.5 V高压锂金属电池

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中文摘要：与液态电解质相比,聚合物电解质(SPEs)具有更高的安全性,在储能领域具有广阔的应用前景.但是其高压下易分解、室温离子电导率低、室温循环性能差等问题阻碍了SPEs的应用.本研究以丙烯酸三氟乙酯和碳酸乙烯亚乙酯为原料,丁二腈为增塑剂,原位聚合制备了氟化聚碳酸酯基固态电解质SNSPE-40.SNSPE-40在25℃条件下离子电导率高达1.33 mS cm-1,电化学窗口达到5.4 V.得益于富含氟化锂的SEI层的形成,Li|SNSPE-40|Li电池以0.1 mA cm-2电流密度稳定循环了2000 h.在4.5 V截止电压和室温条件下,Li|SNSPE-40|LiNi0.9Co0.05-Mn0.05O2电池实现了0.5 C(1 C=220 mA g-1)倍率300圈的稳定循环(57.4％容量保持率).Li|SNSPE-40|LiCoO2电池实现了1 C(1 C=200 mA g-1)倍率250圈的长循环(54.9％容量保持率).这种新型固态电解质在高压固态锂金属电池中表现出巨大应用潜力.

外文标题：Fluorinated polycarbonate-based solid electrolyte plasticized using succinonitrile for 4.5 V lithium metal batteries

外文摘要：Solid polymer electrolytes(SPEs)are a great promising choice for energy storage owing to their enhanced safety compared to liquid electrolytes.However,challenges such as the decomposition under the high voltage,low room-temperature ionic conductivity and poor room-temperature cycling performance have hindered the practical application of SPEs.In this study,SNSPE-40,a novel fluorinated poly-carbonate-based electrolyte was prepared by the in-situ poly-merization of 2,2,2-trifluoroethyl acrylate and 4-vinyl-1,3-dioxolan-2-one;succinonitrile was added to the electrolyte as a plasticizer.Notably,SNSPE-40 exhibits a high ionic con-ductivity of 1.33 mS cm-1 and wide electrochemical window of 5.4 V(vs.Li/Li+)at 25℃.Due to the LiF-rich solid electrolyte interphase(SEI),the Li|SNSPE-40|Li symmetric cell remained stable for 2000 h at 0.1 mA cm-2.Finally,the Li|SNSPE-40|LiNi0.9Co0.05Mn0.05O2 cell,with a cut-off voltage of 4.5 V,dis-played good cycling stability at 0.5 C(1 C=220 mA g-1)and 26℃(57.4％capacity retention after 300 cycles).The Li|SNSPE-40|LiCoO2 cell displayed a long-cycling ability with a capacity retention of 54.9％for 250 cycles at 1 C(1 C=200 mA g-1)under the same voltage and temperature condi-tions.This new solid polymer electrolyte shows great potential for the application in high-voltage solid-state lithium metal batteries.

外文关键词：

solid polymer electrolytefluorinated polycarbonatesuccinonitrilelithium metal batteriessolid electrolyte inter-phase

作者：

孙锦旭、王勇、李瑀、封伟

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作者单位：

School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China

Institute of Advanced Technology and Equipment,Beijing University of Chemical Technology,Beijing 100029,China

Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education,Tianjin 300072,China

关键词：

solid polymer electrolyte fluorinated polycarbonate succinonitrile lithium metal batteries solid electrolyte inter-phase

基金：

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaJiangsu Key Laboratory of Electrochemical Energy Storage Technologies

项目编号：

2022YFB38057025213030352327802EEST2021-4

出版年：

2024

DOI：

10.1007/s40843-024-2904-2

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(5)