Abstract
Gel-type polymer electrolytes are prepared using PVdF/PEGDA/PMMA, LiPF 6/LiCF 3SO 3 mixed lithium salts and ceramic fillers such as Al 2O 3, BaTiO 3 and TiO 2. The electrochemical properties of these electrolytes, such as electrochemical stability, ionic conductivity and compatibility with electrodes are investigated in addition to the physical properties. The charge–discharge performances of lithium-ion polymer batteries using these get-type polymer electrolytes are investigated. The gel-type polymer electrolytes containing a mixed lithium salt of LiPF 6/LiCF 3SO 3 (10/1, wt.%) exhibit more stable ionic conductivity and lower interfacial resistance than those containing only LiPF 6. In addition, an Al 2O 3 filler improves interfacial stability between the electrode and the polymer electrolyte. Stacking cells (MCMB 1028/LiCoO 2, 8 cm × 13 cm × 7 ea) composed of gel-type polymer electrolytes based on PVdF/PEGDA/PMMA, LiPF 6/LiCF 3SO 3 (10/1, wt.%) and Al 2O 3 filler maintain 95% of initial capacity after 100 cycles at a C/2 rate.
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