Patent ID: 9698425
Date: 2017-07-04
CPC Classifications: C01B,H01M,Y02E,Y02P

Claim:
1. A positive electrode material, comprising: an aggregate formed by aggregating electrode-active material particles having a carbonaceous film formed on a surface, wherein an average particle size of the aggregate is 0.5 to 100 μm, a pore size (D50) when an accumulated volume percentage of a pore size distribution of the aggregate is 50% is 0.1 to 0.2 μm, porosity of the aggregate is 15 to 50 vol % with respect to a volume of an aggregate in which a void is not present, the aggregate has a plurality of voids at the inside, including a shell-like aggregate having a void at the inside, and a ratio of an average film thickness of the carbonaceous film in an outer peripheral portion and an inner peripheral portion of an outer shell of the shell-like aggregate (a thickness of the carbonaceous film in the inner peripheral portion/a thickness of the carbonaceous film in the outer peripheral portion) is 0.7 to 1.3, a tap density of the aggregate is 1.0 to 1.5 g/cm the electrode-active material comprises Li an amount of carbon in the carbonaceous film is 0.8 to 2.5 parts by mass on the basis of 100 parts by mass of the electrode-active material, 80% or more of the surface of the electrode-active material is covered with the carbonaceous film, and an average particle size of primary particles of the electrode-active material particles is 0.02 to 5 μm.