| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery keeping a high operating voltage and excellent charge and discharge cycle characteristics by providing a specified positive electrode, a negative electrode, and a nonaqueous electrolyte. SOLUTION: This secondary battery has a positive electrode 1 mainly composed of LiMn2 O4 which is a composite oxide of Li and Mn and having P or P oxide added thereto, the adding ratio of P being preferably 0.02-0.1 by mole ratio to Mn, a negative electrode 3, and a nonaqueous electrolyte. A part of Mn is preferably substituted by Co, Ni. The material for the positive electrode active material of this battery is obtained by mixing a Li compound (e.g. Li2 Co3 ), a Mn compound (e.g. Mn3 O4 ), and P or a P compound (e.g. P2 O5 ), and thermally treating the mixture in oxidizing atmosphere, for example, at a high temperature of 650-900%oC to cover the particle surface of LiMn2 O4 which is the composite oxide of Li and Mn with P. |
