Gel-type polymer electrolytes with different types of ceramic fillers and lithium salts for lithium-ion polymer batteries

摘要

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. percent) 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 x 13 cm x 7 ea) composed of gel-type polymer electrolytes based on PVdF/PEGDA/PMMA, LiPF_6/LiCF_3SO_3 (10/1, wt. percent) and Al_2O_3 filler maintain 95 percent of initial capacity after 100 cycles at a C/2 rate.