| abstract |
It relates to a positive electrode material for a lithium ion battery made of an excess lithium layered lithium metal composite oxide, and provides a material capable of increasing the volume energy density as an electrode and exhibiting good rate characteristics. General formula Li 1 + x Ma 1 -xy Mb y O 2 (x = 0.1 to 0.33, y = 0 to 0.3, Ma necessarily contains Mn, and also contains at least one or more elements selected from Ni and Co And, the Mn content in Ma is 30 to 80% by mass, Mb is at least one element selected from the group consisting of Al, Mg, Ti, Fe, and Nb), consisting of a lithium metal composite oxide having a layer structure A positive electrode material for a lithium ion battery is proposed, wherein the positive electrode material for a lithium ion battery is characterized by having a primary particle average particle diameter of 1.0 µm or more and a tap density of 1.9 g/cm 3 or more. |