NONAQUEOUS ELECTROLYTE CELL

摘要

A nonaqueous electrolyte cell in which excellent cell performance is ensured after preservation by controlling swelling of the cell during high temperature preservation. The nonaqueous electrolyte cell has a specified constitution of nonaqueous electrolyte, and is characterized by being combined with a positive electrode active substance having specified crystal structure and composition. The nonaqueous electrolyte cell comprising a positive electrode, a negative electrode and nonaqueous electrolyte, characterized in that the nonaqueous electrolyte contains at least cyclic carbonate having a carbon-carbon pi bond, and the positive electrode is represented by a composition formula LixMnaNibCocO2 (where, 0<=x<=1.1, a+b+c=1, ||a-b||<0.05, 0