MAGNESIUM-INCLUDING LITHIUM-MANGANESE COMPOUND OXIDE HAVING SPINEL STRUCTURE, AND PRODUCTION AND USE OF THE SAME COMPOUND OXIDE

摘要

PROBLEM TO BE SOLVED: To provide a lithium-manganese compound oxide having a spinel structure, in which the elution of Mn is restrained in an organic electrolyte solution, and also to provide a lithium secondary battery excellent in cycle stability. SOLUTION: This magnesium-including lithium-manganese compound oxide having a spinel structure is expressed by the formula Lix.Mgy1.My2.Mn(2-y1-y2)O4 [wherein, M is Cr, Fe, Ti, Al or the like; 1(x)=1.15; 0.01=(y1)=0.2; 0=y2=0.2], and has 0.2-7 m average primary particle diameter and 0.05-2 m2/g BET specific surface area. When producing the magnesium-including lithium-manganese compound oxide having a spinel structure by blending a Li compound and a Mn one with a Mg compound and by calcinating the mixture, the calcination temperature is 800-950 deg.C. The magnesium-including lithium- manganese compound oxide having a spinel structure is adopted in a Li secondary battery as an anode active material.