Lithium iron phosphate cathode material and preparation method therefor, and lithium-ion battery
AssigneeGuangdong Brunp Recycling Technology Co., Ltd.
InventorsHaijun YU, Changdong LI, Tao WANG, Weiyan HUANG
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Abstract
A lithium iron phosphate cathode material includes a matrix and a carbon coating layer coated on a surface of the matrix. A crystal structure factor A of the lithium iron phosphate cathode material satisfies 4.600 Å−4≤A≤9.500 Å−4. The calculation formula of the crystal structure factor A is: A = C × 10 5 D ( 0 1 0 ) × V ; wherein C is a crystallinity of the crystal; V is a unit cell volume; D(010) is a grain size of a crystal plane D(010), with a value satisfying 4 Å≤D(010)≤9 Å. Lithium iron phosphate cathode materials that meet the above range have excellent low-temperature electrochemical properties.
Claims10
A lithium iron phosphate cathode material, comprising a matrix and a carbon coating layer coated on a surface of the matrix, wherein a crystal structure factor A of the lithium iron phosphate cathode material satisfies 4.600 Å−4 Å≤9.500 Å−4, and a calculation formula of the crystal structure factor A is:
- A
- =
- C
- ×
- 1
-
- 0
- 5
- D
-
- (
- 0
-
- 1
-
- 0
- )
- ×
- V
- ,
- wherein C is a crystallinity of the lithium iron phosphate cathode material, and the crystallinity is measured by a ratio of a XRD diffraction peak intensity of a crystal plane (311) to an integral area of a diffraction peak;
- V is a unit cell volume of the lithium iron phosphate cathode material in a unit of Å3;
- and
- D(010) is a grain size of a crystal plane D(010) of the lithium iron phosphate cathode material in a unit of Å, with a value satisfying 4 Å≤D(010)≤9 Å.
Dependencies are inferred from the claim text.