Non-aqueous electrolyte secondary batter and method of producing the same.

摘要

A non-aqueous electrolyte secondary battery which comprises a composite oxide consisting of manganese and lithium as an active material of a positive electrode (6) wherein crystal having tetragonal sublattice, of which lattice constants of a and c axes are respectively within 4.8 to 5.1 ANGSTROM and 2.83 to 2.87 ANGSTROM , is contained. In the aforementioned non-aqueous electrolyte secondary battery, cycle-capacity characteristic is stable.