| 摘要 |
A lithium secondary battery maintaining a high reliability and a high energy density even after storage in high temperature atmosphere is obtained. It includes a positive electrode having an oxide containing lithium as a positive electrode active material, a negative electrode having a negative electrode active material capable of reacting chemically with the lithium, an electrolyte solution, a separator, and a ligand. The electrolyte solution contains a solvent, and an electrolyte dissolved in the solvent. The solvent has about 20 donor number or less. The ligand is oriented at the interface of the electrolyte solution and positive electrode surface, and at the interface of the electrolyte solution and negative electrode surface, and has a stronger coordination selecting capacity than the solvent or electrolyte against the lithium, and also has a cyclic structure having a pore in the chemical formula. The pore has a diameter of about 1.7 angstroms or more. The ligand is contained in a range of 10<-1> to 10<-4> by molar ratio to the electrolyte. Or the ligand is contained in a range of 1 micromole to 1 millimole per 1 Ah of the battery capacity. The solvent contains one mixed solvent of (a) cyclic carbonate and chain carbonate, or (b) cyclic carbonate, chain carbonate, and aliphatic ester carbonate., and the amount of the mixed solvent contains more than 80% of the total volume of the solvent. <IMAGE> |
