Development of lithium-ion polymer battery with room temperature molten salt

摘要

Imidazolium type room temperature molten salt and its polymerized electrolyte have already been found to have higher ionic conductivity and better thermal stability than those of normal organic electrolyte. Especially, LiBF{sub}4-EMIBF{sub}4 has both high ionic conductivity and low viscosity, so it was evaluated as electrolyte for a lithium-ion battery or a lithium-ion polymer battery. Since its reduction potential is higher than that of lithium, a Li{sub}4Ti{sub}5O{sub}12 / polymerized LiBF{sub}4-EMIBF{sub}4 / LiCoO{sub}2 cell was used to evaluate its cell performance. The cell showed good cycle life comparable to a Li{sub}4Ti{sub}5O{sub}12 / liquid LiBF{sub}4-EMIBF{sub}4 /LiCoO{sub}2 cell.