| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrolyte having high lithium cycle efficiency, suppressing the corrosion of a positive electrode current collector, superior in charging discharging characteristics, and improved in safety and reliability by using organic acid lithium salt as a solute, and using an organic ether compound or an organic solvent which is mainly made of it for the solvent. SOLUTION: An organic acid lithium salt expressed by formula is used for a solute, where (n) and (m) are integers of 1-4 respectively. Chain-like ether such as 1,2-dimethoxyethane and ring-like ether such as tetrahydrofuran are used alone or as a mixture of these organic ether compounds as a solvent. When the organic acid lithium salt is dissolved in the organic solvent of use, the oxidation potential of aluminum becomes higher than the positive electrode potential at the time of a normal electric charging, a positive electrode aluminum current collector is hardly dissolved into an electrolyte, and a good electric charging can be made. |
