US 12,463,205 B2
Positive electrode active material and non-aqueous electrolyte secondary battery using the positive electrode active material
Kenji Yokoe, Okazaki (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Feb. 13, 2022, as Appl. No. 17/670,495.
Claims priority of application No. 2021-021538 (JP), filed on Feb. 15, 2021.
Prior Publication US 2022/0263077 A1, Aug. 18, 2022
Int. Cl. H01M 4/525 (2010.01); H01M 4/36 (2006.01); H01M 4/48 (2010.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/483 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A positive electrode active material, comprising:
a core portion which contains a lithium transition metal composite oxide; and
a coat portion with which at least part of a surface of the core portion is coated, wherein:
the coat portion contains brookite-type TiO2 and rutile-type TiO2, and does not contain anatase-type TiO2,
a presence ratio (A/B) between an amount of presence (A) of Ti serving as the brookite-type TiO2 in the coat portion and an amount of presence (B) of Ti serving as the rutile-type TiO2 in the coat portion which is calculated based on Ti peak analysis by XAFS is 0.15 to 2.0,
an amount of a metallic element except an alkali metal element contained in the core portion which is calculated based on ICP analysis on a molar basis is assumed to be 100 parts, and
an amount of Ti serving as the brookite-type TiO2 and the rutile-type TiO2 in the coat portion is 0.5 to 5.0 parts.