公开(公告)号：US20230178729A1

公开(公告)日：2023-06-08

申请号：US18165252

申请日：2023-02-06

Applicant: BASF TODA BATTERY MATERIALS LLC

Inventor： Satoshi TANIMOTO ,  Hiroyoshi NOGUCHI ,  Zhen QUAN ,  Noriyasu KIMURA ,  Tsuyoshi WAKIYAMA ,  Kazumichi KOGA ,  Yoko TOMOTA

IPC: H01M4/525 ,  H01M4/04

CPC classification number: H01M4/525 ,  H01M4/0471 ,  H01M2004/028

Abstract: A positive electrode active material of the present invention comprising a composite oxide containing Li and Ni, and optionally containing at least one element other than Li and Ni, is characterized in one of the following: primary particles constituting each of secondary particles of the composite oxide and having a variation coefficient of span of 17% or less, the span being a formula: (D190−D110)/D150 (D110, D150, D190: particle diameter corresponding to 10%, 50%, 90% of an integrated value in a number standard-particle diameter distribution of primary particle size); the primary particles having a variation coefficient of D150 of 19% or less; and the secondary particles having each of values of 1.00% or less, the values being formulae: |[ER1−ER21)/ER1]|×100, |[ER1−ER22)/ER1]|×100, |[ER1−ER23)/ER1]|×100 (ER1, ER21, ER22, ER23: element ratio (Li/(Ni+Other element(s))) of entire secondary particles, small particles, middle particles, large particles).