Fluorine-containing triblock copolymers as solid-state polymer electrolytes for lithium metal batteries

被引:42
|
作者
Sun, Yuxue [1 ]
Zhang, Xiaorong [1 ]
Ma, Chunhui [1 ]
Guo, Nan [1 ]
Liu, Yulong [1 ]
Liu, Jun [1 ]
Xie, Haiming [1 ]
机构
[1] Northeast Normal Univ, Dept Chem, Natl & Local United Engn Lab Power Battery, Changchun 130024, Peoples R China
关键词
Block copolymer electrolyte; Fluorine-containing polymer; Solid-state electrolyte; All-solid-state lithium metal batteries; IONIC-CONDUCTIVITY; B-PS; TRANSPORT; TEMPERATURE; PERFORMANCE; COMPLEXES; MEMBRANES; MOBILITY; PHASE;
D O I
10.1016/j.jpowsour.2021.230686
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Block copolymer electrolytes (BCPEs) are promising candidates for solid-state lithium battery applications because they can achieve improved mechanical performance and conductivity simultaneously. In this report, we report on fluorine-containing ABA triblock copolymer electrolytes (FBCPEs) with A blocks of perfluoroalkyl pendants and B blocks of poly(ethylene oxide) (PEO). It is found that fluorine-containing blocks endows considerable mechanical strength, high lithium ion transference number of t(Li+) = 0.41, and wide electrochemical stability window up to 4.9 V to FBCPEs. In addition, FBCPEs can also participate in forming fluorinated solid electrolyte interphase (SEI), and thus serves to enhance the cycle stability of batteries. Combination of these excellent properties leads to the LiFePO4/FBCPEs/Li cells with excellent cycling performance and rate capability. The cycle results of the assembled LiNi0.6Co0.2Mn0.2O2/FBCPEs/Li cells indicate that FBCPEs have potential for application in high-voltage battery systems.
引用
收藏
页数:11
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