Positive active material for nonaqueous secondary battery, and nonaqueous secondary battery using the same

摘要

The present invention can provide the nonaqueous electrolytic secondary battery excellent in cycle life characteristics and characteristics in discharge at a high rate as well as in safety in overcharge without reducing the discharge capacity by using the positive active material, which is obtained from starting materials containing Na and S by a simple production step such as water-washing treatment after synthesis and which contains less than 0.1% by weight of the sulfate group (SO42-), less than 0.024% by weight of Na and/or less than 0.13% by weight of lithium sodium sulfate (LiNaSO4).