US 12,424,657 B2
Positive-electrode material and battery
Hiroki Kamitake, Osaka (JP); Izuru Sasaki, Aichi (JP); and Seiji Nishiyama, Osaka (JP)
Assigned to Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Sep. 6, 2022, as Appl. No. 17/929,775.
Application 17/929,775 is a continuation of application No. PCT/JP2021/010464, filed on Mar. 15, 2021.
Claims priority of application No. 2020-066867 (JP), filed on Apr. 2, 2020.
Prior Publication US 2022/0416297 A1, Dec. 29, 2022
Int. Cl. H01M 10/0562 (2010.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01)
CPC H01M 10/0562 (2013.01) [H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 2004/028 (2013.01); H01M 2300/008 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A positive-electrode material comprising:
a positive-electrode active material; and
a coating layer covering the positive-electrode active material,
wherein the coating layer contains niobium and carbon,
the positive-electrode active material and the coating layer constitute a coated active material, and
a ratio Nb/C of a niobium content to a carbon content in a surface layer portion of the coated active material is 0.11 or more based on an atomic ratio, wherein the ratio Nb/C is measured by surface composition analysis using XPS to a depth 10 nm from an outermost surface of the coated active material.