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Chemically Modified Polyvinyl Butyral Polymer Membrane as a Gel Electrolyte for Lithium Ion Battery Applications
Author(s) -
Xu Ziqiang,
Li Wenlei,
Chen Zhi,
Wang Dongxia,
Feng Tingting,
Potapenko Hanna,
Wu Mengqiang
Publication year - 2019
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201800477
Subject(s) - materials science , electrolyte , polyvinyl butyral , membrane , chemical engineering , thermal stability , phase inversion , electrochemistry , ionic conductivity , lithium ion battery , electrochemical window , polymer , battery (electricity) , porosity , lithium (medication) , composite material , electrode , chemistry , medicine , biochemistry , power (physics) , physics , quantum mechanics , engineering , endocrinology
A novel porous membrane of chemically modified polyvinyl butyral (mPVB), with improved thermal properties and chemical stability for lithium ion battery applications, is successfully synthesized by utilizing the chain extension reaction of the OH units from PVB. The porous mPVB membranes are obtained via the tape casting and phase inversion method. The corresponding gel polymer electrolyte (GPE) is achieved by immersing the as‐prepared membranes in the liquid electrolyte. The electrochemical performances of the GPE show that the mPVB membranes have the features of good uniformity, high porosity ( ≈ 90%), great thermal stability, and high mechanical strength. Moreover, the GPE exhibits good chemical stability, a wide electrochemical window, as well as high ionic conductivity ( ≈ 1.21 × 10 −3 S cm −1 ). A test of a Li/GPE/LiFePO 4 battery cell shows a capacity of 147.7 mAh g −1 and excellent cycling stability, demonstrating the great potential of the mPVB‐based GPE for lithium ion battery applications.