| 摘要 |
An active material for a nonaqueous electrolyte secondary battery containing a lithium transition metal composite oxide having an ±-NaFeO 2 -type crystal structure and being represented by the compositional formula: Li 1+± Me 1-± O 2 wherein Me is a transition metal element containing Co, Ni and Mn and ± > 0, and a method for production thereof, wherein in the lithium transition metal composite oxide, the molar ratio of Li to the transition metal element Me (Li/Me) is 1.2 to 1.4, D10 is 6 to 9 µm, D50 is 13 to 16 µm and D90 is 18 to 32 µm where particle sizes at cumulative volumes of 10%, 50% and 90% in a particle size distribution of secondary particles are D10, D50 and D90, respectively, and the particle size of a primary particle is 1 µm or less. |
