Tuning Thin‐Film Electrolyte for Lithium Battery by Grafting Cyclic Carbonate and Combed Poly(ethylene oxide) on Polysiloxane

Abstract 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 spec...

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Bibliographic Details
Published in:ChemSusChem
Main Authors: Li, Jie, Lin, Yue, Yao, Hehua, Yuan, Changfu, Liu, Jin
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2014
Subjects:
Carbonic acid
Online Access:http://dx.doi.org/10.1002/cssc.201400113
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fcssc.201400113
http://onlinelibrary.wiley.com/wol1/doi/10.1002/cssc.201400113/fullpdf
Description
Summary:Abstract 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.

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