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Imidazolium‐functionalized norbornene ionic liquid block copolymer and silica composite electrolyte membranes for lithium‐ion batteries
Author(s) -
He Xiaohui,
Wang Zijie,
Zhou Weihua,
Jiang Xiong,
Han Zhilong,
Chen Defu
Publication year - 2017
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.44884
Subject(s) - polymer chemistry , ionic liquid , ionic conductivity , norbornene , polyelectrolyte , electrolyte , materials science , copolymer , thermal stability , lithium (medication) , polymerization , imide , chemistry , organic chemistry , polymer , catalysis , composite material , medicine , electrode , endocrinology
Imidazolium‐functionalized norbornene and benzene‐functionalized norbornene were synthesized and copolymerized via ring‐opening metathesis polymerization to afford a polymeric ionic liquid (PIL) block copolymers {5‐norbornene‐2‐methyl benzoate‐ block ‐5‐norbornene‐2‐carboxylate‐1‐hexyl‐3‐methyl imidazolium bis[(trifluoromethyl)sulfonyl]amide [P(NPh‐ b ‐NIm‐TFSI)]} with good thermal stability. On this basis, the solid electrolyte, P(NPh‐ b ‐NIm‐TFSI)–lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), through blending with LiTFSI, and the nanosilica composite electrolyte, P(NPh‐ b ‐NIm‐TFSI)–LiTFSI–SiO 2 , through blending with LiTFSI and nanosilica, were prepared. The effects of the PILs and silica compositions on the properties, morphology, and ionic conductivity were investigated. The ionic conductivity was enhanced by an order of magnitude compared to that of polyelectrolytes with lower PIL compositions. In addition, the ionic conductivity of the nanosilica composite polyelectrolyte was obviously improved compared with that of the P(NPh‐ b ‐NIm‐TFSI)–LiTFSI polyelectrolyte and increased progressively up to a maximum with increasing silica content when SiO 2 was 10 wt % or lower. The best conductivity of the P(NPh‐ b ‐NIm‐TFSI)–20 wt % LiTFSI–10 wt % SiO 2 composite electrolyte with 7.7 × 10 −5 S/cm at 25 °C and 1.3 × 10 −3 S/cm at 100 °C were obtained, respectively. All of the polyelectrolytes exhibited suitable electrochemical stability windows. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44884.