US 12,142,755 B2
Manufacturing method of carbon-coated lithium iron phosphate material
Ya-Hui Wang, Taoyuan (TW); and Feng-Yen Tsai, Taoyuan (TW)
Assigned to Advanced Lithium Electrochemistry Co., Ltd., Taoyuan (TW)
Filed by Advanced Lithium Electrochemistry Co., Ltd., Taoyuan (TW)
Filed on Jul. 29, 2023, as Appl. No. 18/227,921.
Claims priority of application No. 112101114 (TW), filed on Jan. 11, 2023.
Prior Publication US 2024/0234697 A1, Jul. 11, 2024
Int. Cl. H01M 4/36 (2006.01); C01B 25/45 (2006.01); H01M 4/58 (2010.01); H01M 4/587 (2010.01)
CPC H01M 4/366 (2013.01) [C01B 25/45 (2013.01); H01M 4/5825 (2013.01); H01M 4/587 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A manufacturing method of a carbon-coated lithium iron phosphate material, comprising steps of:
(a) providing a first slurry, a lithium source, and a first carbon source having a first weight, wherein the first slurry is formed from an iron source and a phosphorus source, wherein the lithium source, the iron source and the phosphorus source are configured to form a core layer of the carbon-coated lithium iron phosphate material, and the first weight is equal to an input value;
(b) mixing and grinding the first carbon source, the lithium source and the first slurry to form a second slurry;
(c) performing a carbon content analysis on the second slurry to obtain a loss value, wherein the loss value is smaller than the input value and greater than zero, and the carbon content analysis is performed by a brix meter;
(d) adding a second carbon source having a second weight into the second slurry to form a third slurry, wherein the second weight is equal to the loss value; and
(e) drying and sintering the third slurry to form the carbon-coated lithium iron phosphate material, wherein the carbon-coated lithium iron phosphate material comprises the core layer and a carbon coating layer coated on the core layer, wherein the core layer is formed from the lithium source, the iron source and the phosphorus source, and the carbon coating layer is formed from the first carbon source and the second carbon source.