Granted Patent B2

US 12,548,773 · App. 18/740,553 · Granted Feb 10, 2026

Inventors: Yiqing Zhao (Guangdong, CN); Chenxu Fang (Guangdong, CN)

Assignee: HITHIUM TECH HK LIMITED

H01M4/5825C01B25/45H01M4/131H01M10/0525C01P2002/72C01P2002/76C01P2002/77C01P2004/51C01P2006/10C01P2006/40H01M2004/021H01M2004/028

Abstract

Claims (26)

1 . A positive active material, comprising lithium iron phosphate particles, wherein:

a volume percentage of the lithium iron phosphate particles having a particle size smaller than 1 μm is x, x is 14%;

a volume percentage of the lithium iron phosphate particles having a particle size not smaller than 1 μm and not greater than 5 μm is y, y ranges from 51% to 55%;

a volume percentage of the lithium iron phosphate particles having a particle size greater than 5 μm and smaller than 20 μm is z, z ranges from 31% to 35%;

z/x ranges from 2.2 to 2.5;

a volume of a unit cell of the lithium iron phosphate particles is V in units of Å 3 , V ranges from 294.2 to 294.3; and

(z/x)*(V/300) ranges from 2.16 Å 3 to 2.45 Å 3 .

2 . A positive electrode plate, comprising:

a positive current collector; and

a positive active substance layer coated on the positive current collector, the positive active substance layer comprising a positive active material, the positive active material comprising lithium iron phosphate particles, wherein:

a volume percentage of the lithium iron phosphate particles having a particle size smaller than 1 μm is x, x is 14%;

a volume percentage of the lithium iron phosphate particles having a particle size not smaller than 1 μm and not greater than 5 μm is y, y ranges from 51% to 55%;

a volume percentage of the lithium iron phosphate particles having a particle size greater than 5 μm and smaller than 20 μm is z, z ranges from 31% to 35%;

z/x ranges from 2.2 to 2.5;

a volume of a unit cell of the lithium iron phosphate particles is V in units of Å 3 , V ranges from 294.2 to 294.3; and

(z/x)*(V/300) ranges from 2.16 Å 3 to 2.45 Å 3 .

3 . A lithium-ion battery, comprising:

a housing; and

an electrode assembly disposed in the housing, the electrode assembly comprising a negative electrode plate and a positive electrode plate, wherein the positive electrode plate comprises a positive current collector and a positive active substance layer coated on the positive current collector, the positive active substance layer comprising a positive active material, the positive active material comprising lithium iron phosphate particles, wherein:

a volume percentage of the lithium iron phosphate particles having a particle size smaller than 1 μm is x, x is 14%;

a volume percentage of the lithium iron phosphate particles having a particle size not smaller than 1 μm and not greater than 5 μm is y, y ranges from 51% to 55%;

a volume percentage of the lithium iron phosphate particles having a particle size greater than 5 μm and smaller than 20 μm is z, z ranges from 31% to 35%;

z/x ranges from 2.2 to 2.5;

a volume of a unit cell of the lithium iron phosphate particles is V in units of Å 3 , V ranges from 294.2 to 294.3; and

(z/x)*(V/300) ranges from 2.16 Å 3 to 2.45 Å 3 .

4 . An electrical device, comprising the lithium-ion battery according to claim 3 .

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (33)