Electrochemical Properties of a TetraPEG-based Gel Electrolyte Containing a Nonflammable Fluorinated Alkyl Phosphate for Safer Lithium-ion Batteries

We report a nonflammable gel electrolyte based on two key soft materials: 1) a homogeneous polymer network prepared from tetra-armed poly(ethylene glycol) (TetraPEG) and 2) a tris(2,2,2-trifluoroethyl)phosphate (TFEP)-based electrolyte solution. At the equilibrium swelling state, the concentration o...

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Bibliographic Details
Published in:Chemistry letters 2018-07, Vol.47 (7), p.909-912
Main Authors: Han, Jihae, Yoshitake, Mari, Sakai, Takamasa, Yoshimoto, Nobuko, Morita, Masayuki, Fujii, Kenta
Format: Article
Language:English
Subjects:
Electrochemical analysis
Electrolytes
Fluorination
Lithium
Lithium-ion batteries
Polyethylene glycol
Polymers
Rechargeable batteries
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Summary:We report a nonflammable gel electrolyte based on two key soft materials: 1) a homogeneous polymer network prepared from tetra-armed poly(ethylene glycol) (TetraPEG) and 2) a tris(2,2,2-trifluoroethyl)phosphate (TFEP)-based electrolyte solution. At the equilibrium swelling state, the concentration of the polymer in the TetraPEG gel was relatively low, at only 5.6 wt.%. The TetraPEG gel exhibits a wide electrochemical window of ∼5.0 V and thus works well as an electrolyte for a positive electrode, i.e., a lithium iron phosphate (LiFePO4).
ISSN:0366-7022
1348-0715
DOI:10.1246/cl.180283