Positive-electrode active material for non-aqueous electrolyte secondary battery and method for producing same
AssigneeNichia Corporation
InventorsTomooki KAWASAKI, Kenichi KOBAYASHI, Sachiko MASUDA
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Abstract
A positive-electrode active material for a non-aqueous electrolyte secondary battery is provided. The positive-electrode active material contains a lithium transition metal composite oxide having a spinel structure and containing nickel and manganese. The lithium transition metal composite oxide has a surface region containing niobium as a solid solution. A mole ratio of an amount of niobium to a total amount of nickel and manganese in the surface region decreases according to a distance from a surface in a depth direction in a region from the surface to a distance of 0.3 nm in the depth direction.
Claims15
A positive-electrode active material for a non-aqueous electrolyte secondary battery comprising a lithium transition metal composite oxide having a spinel structure and containing nickel and manganese, wherein
- the lithium transition metal composite oxide has a surface region containing niobium as a solid solution, and wherein
- a mole ratio of an amount of niobium to a total amount of nickel and manganese in the surface region decreases according to a distance from a surface in a depth direction in a region from the surface to a distance of at least 0.3 nm in the depth direction.
A method for producing a positive-electrode active material for a non-aqueous electrolyte secondary battery, comprising:
- providing a base material that contains a lithium transition metal composite oxide having a spinel structure and containing nickel and manganese;
- bringing the base material into contact with a sol or solution containing niobium to obtain a niobium adhesion material;
- and
- performing a heat treatment of the niobium adhesion material at a temperature higher than 500° C. to obtain a heat-treated material.
Dependencies are inferred from the claim text.