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Polyimide‐Based Self‐Standing Polymer Electrolyte Membrane for Lithium‐Ion Batteries
Author(s) -
Wang Ailian,
Xu Hao,
Liu Fulin,
Liu Xu,
Wang Shi,
Zhou Qian,
Chen Jie,
Yang Shiyong,
Zhang Liaoyun
Publication year - 2018
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700477
Subject(s) - polyimide , electrolyte , materials science , thermal stability , ionic liquid , ionic conductivity , electrochemical window , polymer , chemical engineering , thermal decomposition , imide , lithium (medication) , membrane , polymer chemistry , composite material , organic chemistry , chemistry , electrode , layer (electronics) , medicine , biochemistry , engineering , endocrinology , catalysis
A new solid polymer electrolyte composed of a polyimide matrix, an ionic liquid additive (1‐butyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imide, [Bmim][TFSI]), and a lithium salt (lithium bis(trifluoromethanesulfonyl)imide, LiTFSI) is fabricated by the solution‐casting technique. The obtained self‐standing polyimide (PI)‐based polymer electrolyte (PI‐100 %BmimTFSI‐60 %LiTFSI) membranes show a great flexibility, transparency, and infiltration ability. As a result of the high thermal stability of the polyimide matrix, the thermal decomposition temperature of the electrolyte is high (420 °C). The ionic conductivity can be up to 1.73×10 −5 S cm −1 at room temperature and reaches 1.26×10 −3 S cm −1 at 80 °C. In addition, the PI‐100 %BmimTFSI‐60 %LiTFSI electrolytes have a wide electrochemical stability window of 4.8 V, a general lithium ion transference number of 0.12, and good interfacial stability and compatibility. In particular, the assembled LiFePO 4 /Li half cells made from this polyimide‐based electrolyte can light up a light‐emitting diode lamp at room temperature.