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A Composite Gel–Polymer/Glass–Fiber Electrolyte for Sodium‐Ion Batteries
Author(s) -
Gao Hongcai,
Guo Bingkun,
Song Jie,
Park Kyusung,
Goodenough John B.
Publication year - 2015
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201402235
Subject(s) - materials science , electrolyte , composite number , sodium ion battery , separator (oil production) , polymer , chemical engineering , electrochemistry , composite material , hexafluoropropylene , glass fiber , battery (electricity) , ionic conductivity , thermal stability , faraday efficiency , coating , electrode , copolymer , power (physics) , chemistry , physics , tetrafluoroethylene , quantum mechanics , engineering , thermodynamics
An integrated preparation of a low‐cost composite gel–polymer/glass–fiber electrolyte with poly(vinylidene fluoride‐ co ‐hexafluoropropylene) (PVDF‐HFP) reinforced by a glass–fiber paper and modified by a polydopamine coating to tune the mechanical and surface properties of PVDF‐HFP is shown to be applicable to a sodium‐ion battery. The composite polymer matrix exhibits excellent mechanical strength and thermal stability up to 200 °C. After saturating with a liquid electrolyte, a wide electrochemical window and high ionic conductivity is obtained for the composite gel–polymer/glass–fiber electrolyte. When tested in a sodium‐ion battery with Na 2 MnFe(CN) 6 as cathode, the rate capability, cycling performance, and coulombic efficiency are significantly improved. The results suggest that the composite polymer electrolyte is a very attractive separator for a large‐scale battery system where safety and cost are the main concerns.