期刊
SOLID STATE IONICS
卷 282, 期 -, 页码 31-36出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2015.09.017
关键词
PVDF-HFP; PMMA; TiO2 nanoparticles; Composite polymer electrolyte; Lithium ion batteries
资金
- National Natural Science Foundation of China [51202022, 51372033, 61378028]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120185120011]
- 111 Project [B13042]
- Sichuan Youth Science and Technology Innovation Research Team Funding [2011JTD0006]
- International Science and Technology Cooperation Program of China [2012DFA51430]
- Sino-German Cooperation PPP Program of China [201400260068]
(Poly(vinylidene fluoride-co-hexafluoropropylene)/poly(methyl methacrylate)) PVDF-HFP/PMMA based gel polymer electrolyte comprising 0-7 wt% TiO2 nanoparticles has been synthesized. After introducing TiO2 nanoparticles, the thermal properties of the PVDF-HFP/PMMA/TiO2 composite polymer electrolyte (CPE) are remarkably improved: when the working temperature is up to 90 degrees C, the weight loss of CPE with 7% TiO2 is only 12.8% of that without TiO2, suggesting much higher thermal stability; the shrinkage of the CPE at 130 degrees C can also obviously decrease from 23.4% down to 14.4% after introducing TiO2 nanoparticles. In addition, the CPE exhibits much higher ionic conductivity and better electrochemical stability. Furthermore, the LiCoO2/Li cells with CPE exhibit good cyclic stability and C-rate performance: the capacity maintains 92.1% of the initial capacity after 50 cycles; the capacity can reach as large as similar to 80 mAhr(-1) even at 5 C. It is promising for PVDF-HFP/PMMA/TiO2 CPE to meet the practical demands of high-performance and thermal safety for lithium ion batteries. (C) 2015 Elsevier B.V. All rights reserved.
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