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Synthesis and Ring‐Opening Polymerization of Functional Silacyclobutane Derivatives and Their Application to Lithium Ion Batteries
Author(s) -
Matsumoto Kozo,
Endo Takeshi
Publication year - 2015
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201300234
Subject(s) - ethylene carbonate , electrolyte , polymerization , polymer chemistry , monomer , materials science , lithium (medication) , copolymer , thermal stability , polymer , chemical engineering , ring opening polymerization , dimethyl carbonate , diethyl carbonate , chemistry , organic chemistry , catalysis , electrode , composite material , medicine , engineering , endocrinology
Summary Polycarbosilanes, which have a carbon‐silicone backbone, are highly flexible polymers with excellent thermal, chemical, and electrical stability. They can be readily prepared by ring‐opening polymerization of silacyclobutane derivatives. Although polysilacycobutanes are non‐polar in general, they can be compatible to carbonate‐based electrolyte solutions by introducing a 5‐membered cyclic carbonate structure as a pendant group, and if properly designed they can be promising candidates as gelators to prepare gel polymer electrolytes (GPE). We designed a new carbosilane‐based GPE system, which could be prepared by ring‐opening polymerization of a silacyclobutane having a 5‐membered cyclic carbonate structure, 4‐{2‐(1‐methylsilacyclobutyl)}ethyl‐1,3‐dioxolane‐2‐one (SBMC). The GPEs were directly synthesized by copolymerization of the monomer with a crosslinker, 1,6‐bis(1‐methylsilacyclobutyl)hexane (HMBS), in situ of a battery electrolyte solution consisting of 1 M LiPF 6 in an ethylene carbonate (EC) / diethyl carbonate (DEC) mixed solvent. The obtained GPE showed relatively high ionic conductivity compared to usual liquid electrolytes, and the lithium ion batteries composed of this GPE showed charge/discharge performance as high as those composed of the usual liquid electrolyte.