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Tuning Thin‐Film Electrolyte for Lithium Battery by Grafting Cyclic Carbonate and Combed Poly(ethylene oxide) on Polysiloxane
Author(s) -
Li Jie,
Lin Yue,
Yao Hehua,
Yuan Changfu,
Liu Jin
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201400113
Subject(s) - electrolyte , ethylene carbonate , ethylene oxide , polymer chemistry , materials science , propylene carbonate , propylene oxide , lithium (medication) , ionic conductivity , silane , inorganic chemistry , chemistry , chemical engineering , organic chemistry , polymer , copolymer , medicine , electrode , engineering , endocrinology
A tunable polysiloxane thin‐film electrolyte for all‐solid‐state lithium‐ion batteries was developed. The polysiloxane was synthesized by hydrosilylation of polymethylhydrosiloxane with cyclic [(allyloxy)methyl]ethylene ester carbonic acid and vinyl tris(2‐methoxyethoxy)silane. 1 H NMR spectroscopy and gel‐permeation chromatography demonstrated that the bifunctional groups of the cyclic propylene carbonate (PC) and combed poly(ethylene oxide) (PEO) were well grafted on the polysiloxane. At PC/PEO=6:4, the polysiloxane‐based electrolyte had an ionic conductivity of 1.55×10 −4 and 1.50×10 −3 S cm −1 at 25 and 100 °C, respectively. The LiFePO 4 /Li batteries fabricated with the thin‐film electrolyte presented excellent cycling performance in the temperature range from 25 to 100 °C with an initial discharge capacity at a rate of 1 C of 88.2 and 140 mA h g −1 at 25 and 100 °C, respectively.