ACTIVE MATERIAL OF POSITIVE PLATE, NONAQUEOUS ELECTROLYTE SECONDARY CELL, METHOD FOR PRODUCING ACTIVE MATERIAL OF POSITIVE MATERIAL

A non-aqueous electrolyte secondary battery employing a positive electrode active material containing a compound represented by the general formula LixMyPO4, where 0 < x ≤ 2 and 0.8 ≤ y ≤ 1.2, with M containing a 3d transition metal, where LixMyPO4 encompasses that with the grain size not larger than 10 mu m. The non-aqueous electrolyte secondary battery has superior cyclic characteristics and a high capacity.