| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high-purity complex oxide in which each component completely forms a solid solution with LiNiO2 and the cycle characteristics in discharge and charge are improved by adding a lithium compound to a basic metal salt synthesized in the presence of non-oxidizing atmosphere and/or a reducing agent in a water medium, spray-drying or freeze-drying the mixture and baking the mixture under an oxidation atmosphere. SOLUTION: This complex oxide is represented by formula I [M is Al, Fe, Mn or B; 0.01<=(x)<=0.5; (x)=(x1 )+(x2 ); 0.01<=(x1 )<0.5; 0<=(x2 )<0.3; 0.9<=(y)<=1.3]. This method for synthesizing the complex oxide comprises adding a lithium compound corresponding to Li atom molar number shown by (y) to a basic metal salt represented by formula II [M is Al, Fe or Mn; A<n-1> is a n-valent anion; 0.03<Z<0.3; (m) is a positive number] in water medium, adding a boron compound corresponding to atomic number of boron only when boron is included in formula I and subjecting the mixture to spray drying or freeze drying and baking the complex under an oxidizing atmosphere at a temp. of 600-900 deg.C. |
