公开(公告)号：US20190097226A1

公开(公告)日：2019-03-28

申请号：US16142784

申请日：2018-09-26

Applicant: NICHIA CORPORATION

Inventor： Tomooki KAWASAKI ,  Kenichi KOBAYASHI ,  Sachiko MASUDA

IPC: H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  C01G53/00

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.