Invention Grant
- Patent Title: Carbon-coated lithium iron phosphate positive active material, method for preparing same, positive electrode plate containing same, and lithium-ion battery
-
Application No.: US17938930Application Date: 2022-09-06
-
Publication No.: US11721804B2Publication Date: 2023-08-08
- Inventor: Hongyu Liu , Changfeng Bie , Xue Leng , Na Liu
- Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
- Applicant Address: CN Ningde
- Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
- Current Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
- Current Assignee Address: CN Ningde
- Agency: Anova Law Group, PLLC
- Main IPC: H01M4/36
- IPC: H01M4/36 ; H01M4/587 ; H01M4/133 ; H01M4/136 ; H01M10/0525 ; C01B25/45 ; H01M4/58 ; H01M4/02
Abstract:
A positive active material made of carbon-coated lithium iron phosphate includes a lithium iron phosphate substrate, and a carbon coating layer on a surface of the substrate. The lithium iron phosphate substrate has a general structural formula LiFe1-aMaPO4, where M is at least one selected from Cu, Mn, Cr, Zn, Pb, Ca, Co, Ni, Sr, Nb, or Ti, and 0≤a≤0.01. A carbon coating factor of the carbon-coated lithium iron phosphate,
η
=
BET
1
BET
2
,
satisfies 0.81≤η≤0.95, where BET1 denotes a specific surface area of mesopore and macropore structures in the carbon-coated lithium iron phosphate, and BET2 denotes a total specific surface area of the carbon-coated lithium iron phosphate.
η
=
BET
1
BET
2
,
satisfies 0.81≤η≤0.95, where BET1 denotes a specific surface area of mesopore and macropore structures in the carbon-coated lithium iron phosphate, and BET2 denotes a total specific surface area of the carbon-coated lithium iron phosphate.
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