LITHIUM SECONDARY CELL

摘要

A lithium secondary cell capable of maintaining a high reliability and a high energy density even after storage in a high temperature atmosphere. The lithium secondary cell comprises a positive plate containing an oxide containing lithium as the active material of the positive plate, a negative plate containing an active material chemically reactive with lithium, an electrolyte solution, a separator, and a ligand. The electrolyte solution includes a solvent and an electrolyte dissolved in the solvent. The solvent has a donor number of 20 or less. The ligand is provided at the interface between the electrolyte solution and the positive plate and the interface between the electrolyte solution and the negative plate, has a coordination selecting ability with respect to lithium stronger than those of the solvent and the electrolyte, and has a cyclic structure with a hole in its chemical structural formula. The diameter of the hole is more than about 1.7 ANGSTROM . The ligand is contained at a molar ratio of the ligand to the electrolyte in the range from 10<-1> to 10<-4>, or the ligand is contained in the range from 1 mu mole to 1 mmole per unit cell capacity of 1 Ah.