US 11,699,807 B2
Positive electrode material for lithium ion secondary batteries, positive electrode for lithium ion secondary batteries, and lithium ion secondary battery
Satoru Oshitari, Tokyo (JP); Kouji Oono, Tokyo (JP); and Tsutomu Nozoe, Tokyo (JP)
Assigned to Sumitomo Metal Mining Co., Ltd., Tokyo (JP)
Filed by Sumitomo Metal Mining Co., Ltd., Tokyo (JP)
Filed on Sep. 25, 2020, as Appl. No. 17/33,109.
Claims priority of application No. 2020-056157 (JP), filed on Mar. 26, 2020.
Prior Publication US 2021/0305618 A1, Sep. 30, 2021
Int. Cl. H01M 10/0525 (2010.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 10/0525 (2013.01) [H01M 4/0404 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/62 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 12 Claims
 
1. A positive electrode material for lithium ion secondary batteries, comprising a mixture which includes:
a positive electrode active material in which a length of a longest side of a primary particle of the active material is 1 nm or more and 1000 nm or less; and
A NASICON-type compound in which a length of a longest side of a primary particle of the compound is 1 nm or more and 1000 nm or less,
wherein, the positive electrode active material is at least one selected from a group consisting of Li3FePO4, Li Fe0.26Mn0.7Mg0.0349Co0.05Ca0.001PO4, and LiCoPO4, and
the NASICON-type compound is represented by formula LiaAlbTi2-b(PO4)3, and
a mixing ratio by mass of the positive electrode active material to the NASICON-type compound is from 99:1 to 90.5:9.5, wherein 0.8≤a≤1.5 and 0≤b≤0.5.