Journal
ELECTROCHIMICA ACTA
Volume 114, Issue -, Pages 527-532Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.10.052
Keywords
Composite polymer electrolyte; Interfacial compatibility; Ohmic polarization; Overpotential; Li-ion battery
Categories
Funding
- MOST [2011CB935902, 2013CB934000, 2010DFA72760, 2011CB711202, 2013AA050903, 2011AA11A257, 2011AA11A254]
- China Postdoctoral Science Foundation [2013M530599]
- Tsinghua University Initiative Scientific Research Program [2010THZ08116, 2011THZ08139, 2011THZ01004, 2012THZ08129]
- State Key Laboratory of Automotive Safety and Energy [ZZ2012-011]
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Interfacial compatibility of composite polymer electrolyte and electrode is the key factor to affect the performance of polymer Li-ion batteries. In this work, liquid electrolyte, pristine PVDF-HFP (poly(vinylidene fluoride-co-hexafluoropropylene)) gel polymer electrolyte (GPE) and nano-TiO2-poly(methyl methacrylate) (PMMA) hybrid doped PVDF-HFP composite polymer electrolyte (CPE) are used to investigate the interfacial compatibility between electrolyte and electrode on performance of LiCoO2/Li cells. The electrochemical performances of cells are studied by charge/discharge tests and electrochemical impedance. The interfacial compatibility coefficient (lambda) that related to the interface of electrolyte and electrode is evaluated in terms of the fitting (i = e, sf, b and ct) with equivalent circuit and diffusion resistance (R-diff). The results confirm that the C-rare performance of cells with GPE is more significantly associated with the interfacial compatibility than the ionic conductivity of GPE. (C) 2013 Elsevier Ltd. All rights reserved.
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