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Preparation method of phosphate-coated positive electrode active material

A positive active material, phosphate technology, applied in positive electrodes, active material electrodes, chemical instruments and methods, etc., can solve the problems of high cost, difficult to uniform distribution of lithium phosphate, unfavorable coating and other problems

Active Publication Date: 2022-05-17
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional lithium phosphate coating method is difficult to uniformly distribute lithium phosphate on the surface of the positive electrode active material due to the mismatch between the crystal lattices. At the same time, the coating effect of the traditional solid phase coating method is affected by the particle size of the coating. Larger particle size of the coating is not conducive to the coating of the coating, while obtaining smaller coating particles requires nano-nization of the coating, which has a higher cost
For the coating of sol-gel, due to the introduction of organic substances such as citric acid into the system during the coating process, these organic substances need to be sintered at a higher temperature to be removed, and most of the coatings will agglomerate themselves at high temperatures. Not conducive to subsequent uniform surface coating

Method used

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  • Preparation method of phosphate-coated positive electrode active material
  • Preparation method of phosphate-coated positive electrode active material

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preparation example Construction

[0035] see figure 1 , an embodiment of the present invention provides a method for preparing a phosphate-coated positive electrode active material, comprising the following steps:

[0036] S10, adding a phosphorus source and ammonia water into deionized water and mixing to form a coating dispersion, the phosphorus source being one or more of iron phosphate, nickel phosphate, cobalt phosphate, manganese phosphate, copper phosphate and magnesium phosphate;

[0037] S20, coating the coating dispersion liquid on the surface of the positive electrode active material with a spinel structure, and drying to obtain a powder; and

[0038] S30, sintering the dry powder at 200°C-600°C.

[0039] The preparation method of the phosphate-coated positive electrode active material provided by the present invention adopts phosphate containing metal elements as a phosphorus source, and uses ammonia water as a solvent to form a coating liquid, and ammonia water can complex phosphate to form a compl...

Embodiment 1

[0100] (1) Uniformly mix 0.3 g of nickel phosphate, 0.15 g of lithium hydroxide and 25 mL of aqueous ammonia (molar concentration: 2 mol / L) to form a coating dispersion.

[0101] (2) 10g LiMn 2 o 4 (with a particle size of 200nm) placed in a reaction chamber with an ambient temperature of 100°C, the positive electrode active material LiMn 2 o 4 roll.

[0102] (3) Spray the coating dispersion in step (1) from a nozzle with a diameter of 1 μm to 1 mm into the reaction chamber, so that the coating dispersion is formed on the surface of the positive electrode active material.

[0103] (4) After spraying the coating liquid, dry it directly at 120° C. to obtain a dry powder.

[0104] (5) Sintering the dry powder in step (4) at 450° C. in air for 3 hours to obtain a phosphate-coated positive electrode active material.

Embodiment 2

[0106] (1) 0.3 g of nickel phosphate, 0.1 g of lithium hydroxide and 25 mL of ammonia water (molar concentration: 2 mol / L) were uniformly mixed to form a coating dispersion.

[0107] (2) 10g LiMn 2 o 4 (particle size of 200nm) is immersed in the coating dispersion in step (1), and then the impregnating solution is sprayed from a nozzle with a diameter of 1 μm to 1 mm into a cavity with hot air circulation, and the temperature of the hot air is 100°C.

[0108] (3) After spraying the coating liquid, dry it at 100° C. to obtain a dry powder.

[0109] (4) Sintering the dry powder in step (3) at 450° C. in air for 3 hours to obtain a phosphate-coated positive electrode active material.

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Abstract

The invention relates to a preparation method of a phosphate-coated positive electrode active material, which comprises the following steps: adding a phosphorus source and ammonia water into deionized water, and mixing to form a coating dispersion liquid, the phosphorus source being one or more of iron phosphate, nickel phosphate, cobalt phosphate, manganese phosphate, copper phosphate and magnesium phosphate; coating the surface of a positive electrode active material with a spinel structure with the coating dispersion liquid, and drying to obtain powder; and sintering the dried powder at the temperature of 200 DEG C to 600 DEG C.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a phosphate-coated positive electrode active material. Background technique [0002] Compared with other rechargeable battery systems, lithium-ion secondary batteries have the advantages of high working voltage, light weight, small size, no memory effect, low self-discharge rate, long cycle life, and high energy density. They have been widely used in Mobile terminal products such as mobile phones, laptops, and tablets. In recent years, due to environmental protection considerations, electric vehicles have been rapidly developed under the impetus of governments and automobile manufacturers, and lithium-ion secondary batteries have become an ideal power source for new-generation electric vehicles due to their excellent performance . At present, the positive electrode active materials of lithium-ion secondary batteries that people pay attention to can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01G45/12H01M4/131H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01B25/37C01G45/1242H01M4/366H01M4/505H01M4/525H01M4/628H01M4/131H01M10/0525H01M2004/021H01M2004/028C01P2006/40Y02E60/10
Inventor 武怿达黄学杰詹元杰马晓威
Owner SONGSHAN LAKE MATERIALS LAB