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The Effect of Silica Addition on the Properties of Poly((vinylidene fluoride)‐ co ‐hexafluoropropylene)‐Based Polymer Electrolytes
Author(s) -
Kim Kwang Man,
Ryu Kwang Sun,
Kang SeongGu,
Chang Soon Ho,
Chung In Jae
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010301)202:6<866::aid-macp866>3.0.co;2-c
Subject(s) - hexafluoropropylene , electrolyte , fumed silica , crystallinity , thermal stability , materials science , ionic conductivity , polymer , chemical engineering , electrochemistry , polymer chemistry , conductivity , electrode , chemistry , composite material , copolymer , tetrafluoroethylene , engineering
The effect of fumed silica (SiO 2 ) addition on the physical and electrochemical properties of poly((vinylidene fluoride)‐ co ‐hexafluoropropylene) based polymer electrolyte was investigated by various methods including morphology observation, thermal and crystallinity evaluations, impregnation test using an electrolyte solution, electrochemical stability analysis and impedance measurement. About 38 wt.‐% of silica content proved to be the upper limit at which the silica could be no longer added to obtain a self‐sustained polymer electrolyte film. As the silica content increased, a finer pore structure developed, a greater amount of electrolyte solution was absorbed, and thus higher ionic conductivity was shown. The electrochemical stability was preserved up to about 4.5 V for all the polymer electrolytes prepared. The interfacial resistance between the polymer electrolyte and the lithium electrode was reduced with the silica content and also showed a diminishing growth rate with time.