US 12,145,860 B2
Cathode material and manufacturing method thereof, lithium ion battery, and vehicle
Dongjie Hu, Shenzhen (CN); and Hao Wei, Shenzhen (CN)
Assigned to BYD COMPANY LIMITED, Shenzhen (CN)
Appl. No. 17/259,106
Filed by BYD COMPANY LIMITED, Guangdong (CN)
PCT Filed Jul. 10, 2019, PCT No. PCT/CN2019/095351
§ 371(c)(1), (2) Date Jan. 8, 2021,
PCT Pub. No. WO2020/011177, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 201810753608.X (CN), filed on Jul. 10, 2018.
Prior Publication US 2021/0292186 A1, Sep. 23, 2021
Int. Cl. H01M 10/0525 (2010.01); C01G 53/00 (2006.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 4/505 (2010.01); H01M 4/02 (2006.01); H01M 4/525 (2010.01)
CPC C01G 53/56 (2013.01) [H01M 4/366 (2013.01); H01M 4/38 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); C01P 2004/34 (2013.01); C01P 2004/64 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 4/525 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A cathode material, comprising elemental sulfur and secondary particles, wherein
each of the secondary particles is formed by packing primary particles and has a hollow structure and gaps among the primary particles, a coating is formed on an outer surface of each of the secondary particles, and the coating comprises titanium dioxide,
the elemental sulfur fills in the gaps among the primary particles and in the hollow structure of each of the secondary particles, wherein a content of elemental sulfur in the hollow structure is higher than a content of elemental sulfur in the gaps among the primary particles, and
the primary particles comprise a lithium oxide, wherein the primary particles are selected from at least one of rod-shaped lithium oxide and bulk lithium oxide, the primary particles have a length of 0.5-2 μm, a width of 200-500 nm, and an aspect ratio of 2-40, a weight ratio of the lithium oxide, the elemental sulfur of the cathode material, and the titanium dioxide is (90-45):(5-50):(2-8), the lithium oxide comprises δLiNimConX(1-m-n)O2·(1−δ)Li2MO3, X comprises at least one selected from Mn, Al, Nb, and Fe, M comprises at least one of Mn, Al, Nb, Fe, Co, and Ni, 0<δ≤1, 0≤m<1, 0≤n<1, and 0<m+n<1.