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A kind of preparation method of doped modified lithium iron phosphate cathode material

A lithium iron phosphate and cathode material technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of difficult quantitative control, high requirements for batching, mixing, grinding, and difficulty in mixing evenly, reaching high for the first time. The effect of discharge capacity, good application requirements, good cycle performance and rate performance

Active Publication Date: 2021-06-04
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a preparation method of a doped modified lithium iron phosphate positive electrode material, to solve the difficult quantitative control when doping magnesium into iron oxalate by the existing co-precipitation method, and doping a small amount of magnesium compound or It is difficult to mix a small amount of rare earth compounds evenly when batching and mixing, and there are high requirements for batching, mixing, and grinding.

Method used

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  • A kind of preparation method of doped modified lithium iron phosphate cathode material
  • A kind of preparation method of doped modified lithium iron phosphate cathode material
  • A kind of preparation method of doped modified lithium iron phosphate cathode material

Examples

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Embodiment 1

[0046] Using magnesium-containing lithium carbonate as a lithium source and iron phosphate as an iron source, lithium iron phosphate uniformly doped with magnesium is prepared.

Embodiment 1-1

[0048] Lithium iron phosphate (LiMg 0.001 Fe 0.999 PO 4 / C).

[0049] Take 48.00g of iron phosphate, 11.85g of lithium carbonate with a magnesium content of 0.06%, 8.00g of glucose and 72mL of absolute ethanol, put the above materials into a high-energy ball mill and grind for 3 hours, dry at 70°C, and then raise the temperature to 670°C under nitrogen protection. ℃ sintering for 13 hours, cooled to 25 ℃ with the furnace, out of the furnace, ground, sieved, and packaged to obtain magnesium-doped lithium iron phosphate product, the product number is L-1-1a.

Embodiment 1-2

[0051] Lithium iron phosphate (LiMg 0.01 Fe 0.99 PO 4 / C).

[0052] Take 48.00g of iron phosphate, 12.27g of lithium carbonate with a magnesium content of 0.65%, 8.00g of glucose and 80mL of absolute ethanol, put the above materials into a high-energy ball mill and grind for 3 hours, dry at 80°C, and then raise the temperature to 700°C under nitrogen protection. ℃ sintering for 10 hours, cooled to 40 ℃ with the furnace, taken out of the furnace, ground, sieved, and packaged to obtain magnesium-doped lithium iron phosphate product, the product number is L-1-1b.

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Abstract

The invention provides a preparation method of lithium iron phosphate, a cathode material of a lithium ion battery. The method uses battery-grade lithium carbonate doped with magnesium, or doped with magnesium and rare earth as a lithium source, and combines the lithium source with an iron source, phosphorus Source and carbon source ingredients, grinding, drying to obtain doped modified lithium iron phosphate precursor, and then roasting the precursor to obtain lithium iron phosphate positive electrode material products; the battery grade lithium carbonate, its Mg content is 0.06 ~ 1.75%. The preparation method has a short grinding time and is relatively energy-saving, and is conducive to uniform doping of lithium iron phosphate with magnesium, cerium or lanthanum, and is especially convenient for realizing doping of lithium iron phosphate with magnesium, cerium or lanthanum. In the present invention, by compounding rare earth and / or magnesium in the battery-grade lithium carbonate for preparing lithium iron phosphate, not only the grinding time is reduced, the cost is lower, but also the discharge capacity and cycle performance of the lithium iron phosphate cathode material prepared by the method are improved. , rate performance are superior, better meet the application requirements.

Description

technical field [0001] The invention relates to a preparation method of lithium iron phosphate, a positive electrode material of a lithium ion battery, in particular to a method for doping and modifying a lithium iron phosphate positive electrode material, and belongs to the technical field of lithium ion battery positive electrode materials. Background technique [0002] Lithium iron phosphate, as an important positive-stage material of lithium-ion batteries, has been widely used in electric vehicles, energy storage devices, etc. Due to the low electronic conductivity and ionic conductivity of lithium iron phosphate, in order to improve the electrical properties of lithium iron phosphate, the following methods are usually adopted: reducing the particle size of the material, coating the conductive layer, and ion doping. The ion doping method mainly refers to doping some metal ions with good conductivity at the cation positions in the lithium iron phosphate lattice, changing ...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCH01M4/5825Y02E60/10
Inventor 刘述平李超廖祥文张贻周雄冯雪茹唐湘平
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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