| 摘要 |
A positive electrode material for a lithium secondary battery, which is high in safety, high in capacity, excellent in cycle performance, and high in charge/discharge efficiency, is provided. The positive electrode material for a lithium secondary battery is a powder containing a Li-Ni-Co-O or Li-Ni-Co-Ba-O system component as a main component and having an amorphous phase of an oxide mixed in each of particles or formed at the surface of the particle. <??>In one embodiment, the invention provides a positive electrode material powder for a lithium secondary battery, which is a composite oxide powder having a total composition represented by LiaNibCocBadMeOx and each particle of which has an amorphous phase of an oxide where M: one or a plurality of elements selected from the group consisting of Na, K, Si, B, P, and Al a/(b+c): 0.9 to 1.1 b/(b+c): 0.5 to 0.95 c/(b+c): 0.05 to 0.5 d/(b+c): 0.0005 to 0.01 e/(b+c): less than 0.01 (not inclusive of 0) b+c = 1. <??>The invention also comprises a method for producing a positive electrode material for a lithium secondary battery, the method comprising: mixing a component for forming an amorphous phase of an oxide which is composed of one or a plurality of elements selected from the group consisting of Li, Na, K, Si, Ba, B, P, and Al with a Li-Ni-Co-O or Li-Ni-Co-Ba-O system raw material, whereby consequently obtaining a mixture; and firing the mixture. |
