| abstract |
[PROBLEMS] To provide a novel lithium manganese composite oxide and a method for producing the same. Furthermore, by using this lithium-manganese composite oxide as a positive electrode active material, a manganese-based lithium secondary battery having excellent high-rate charge / discharge characteristics is provided. SOLUTION: General formula Li 1 + X Mn 2-YZ M Z O 4+ δ (where M is Ni, Co, Fe, Cr, Cu, B, Al, G a, at least one element selected from In and 0 ≦ X ≦ 1/3, 0 ≦ Y ≦ 1/3, 0 <Z ≦ 0.2 5, -0.14 ≦ δ ≦ 0.5), the average particle size is 5 to 20 μm, the BET specific surface area is 1.0 m 2 · g −1 or less, 1000 A lithium manganese composite oxide having a spinel crystal structure of Å or more, a method for producing the lithium manganese composite oxide, and a lithium secondary battery using the lithium manganese composite oxide as a positive electrode. |