| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a positive pole active material for a nonaqueous electrolyte secondary battery having the specified composition, capable of increasing discharging capacity by baking in two steps a mixture of a compound obtained by replacing part of a nickel salt with a salt of Co or the like and a lithium salt in the specified condition. SOLUTION: As a nickel salt, nickel oxide or nickel hydroxide is used, and part of the nickel of the nickel salt is replaced with the salt of Co, Mn, Fe, V, Cr, Al, or Mg. A mixture of this compound and a lithium salt is baked in two steps, and a positive pole active material represented by the general formula of LiNi1- YMYO2 (M is at least one element selected from Co, Mn, Fe, V, Cr, Al, Mg, and 0<Y<=0.25) is synthesized. As the lithium salt, LiOH or LiNO3 is preferable. In the two step baking, a first step baking is conducted in an air flow at 590-690 deg.C for preferably 2-20 hours, and a second step baking is conducted in an oxygen flow at 700-850 deg.C for preferably 0.25-30 hours. Thereby, the positive active material with high characteristics is obtained. |
