| 摘要 |
PROBLEM TO BE SOLVED: To provide a large output capacity without lowering an energy density when a battery is used as a motor drive source of an electric vehicle by using LiTixMn2-xO4 in which one portion of Mn of LiMn2O4 having a cubic system spinel structure is substituted with Ti as a positive electrode active material and making a substituted amount in a specific range. SOLUTION: As a positive electrode active material of a lithium secondary battery, LiTixMn2-xO4 (x represents a substituted amount) in which one portion of Mn of LiMn2O4 having a cubic system spinel structure is substituted with Ti is used. A substituted amount x is preferably in a range of 0.01<=x<=0.5 and when it is in the range of 0.1<=x<=0.3, since an effect of a low resistance of the positive electrode active material particularly outstandingly appears, the range is more preferable. A synthesis of such LiTixMn2-xO4 is preferably carried out by calcinating a mixture of a salt and/or an oxide of each element prepared at a predetermined ratio at a range of 700-900 deg.C under an oxygen atmosphere for 5 to 50 hours. |
