US 2026/0307993 A1 · LITHIUM IRON PHOSPHATE PRECURSOR, LITHIUM IRON PHOSPHATE CATHODE MATERIAL WITH HIGH COMPACTION DENSITY, AND MANUFACTURING METHOD THEREOF

Abstract

A lithium iron phosphate precursor, the preparation of which includes: uniformly mixing a metal oxide, a dispersant, a carbon source, a lithium source, and a first lithium iron phosphate in an aqueous solution, followed by a first grinding to obtain a first precursor with a median particle diameter (D50) of 0.35 to 0.39 μm; then adding a second lithium iron phosphate to the first precursor, uniformly mixing, and performing a second grinding to obtain the lithium iron phosphate precursor with a median particle diameter (D50) of 0.35 to 0.39 μm. The overall process provided by the present invention is simple and does not require repeated replacement of materials, reaction environments, or equipment, reflecting the advantages of a continuous process. In addition, the lithium iron phosphate battery cathode material produced from this precursor exhibits high compaction density characteristics.

Claims10

Dependent claims

A method for preparing a lithium iron phosphate precursor, comprising steps of:

mixing a metal oxide, a dispersant, a carbon source, a lithium source, and a first iron phosphate in an aqueous solution and performing a first grinding to obtain a first precursor having a median particle diameter (D50) of 0.35 to 0.39 μm;
and
adding a second iron phosphate to the first precursor, uniformly mixing, and performing a second grinding to obtain the lithium iron phosphate precursor having a median particle diameter (D50) of 0.35 to 0.39 μm.

A method for producing a lithium iron phosphate battery cathode material with high compaction density, comprising steps of:

uniformly mixing a metal oxide, a dispersant, a carbon source, a lithium source, and a first iron phosphate in an aqueous solution and performing a first grinding to obtain a first precursor having a median particle diameter (D50) of 0.35 to 0.39 μm, wherein the added amount of the metal oxide is 0.5 to 1 M, the added amount of the dispersant is 0.1 to 0.5 M, the added amount of the carbon source is 14 to 15.5 M, the added amount of the lithium source is 6 to 7 M, and the added amount of the first iron phosphate is 5.5 to 7 M;
uniformly mixing a second iron phosphate with the first precursor and performing a second grinding to obtain a lithium iron phosphate precursor having a median particle diameter (D50) of 0.35 to 0.39 μm, wherein the added amount of the second iron phosphate is 1.5 to 3 M;
and
drying and sintering the lithium iron phosphate precursor to obtain the lithium iron phosphate battery cathode material.

1 more element

Dependencies are inferred from the claim text.

Lithium iron phosphate precursor, lithium iron phosphate cathode material with high compaction density, and manufacturing method thereof

Life of this patent

Lithium iron phosphate precursor, lithium iron phosphate cathode material with high compaction density, and manufacturing method thereof

Life of this patent

Abstract

Claims10