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A preparation method of a nickel-rich ternary material coated with cobalt lithium phosphate

A ternary material, lithium cobalt phosphate technology, applied in the direction of phosphate, phosphorus oxyacid, chemical instruments and methods, etc., can solve the problems of material performance degradation, high cost, uniformity can not be guaranteed, etc., to achieve pH value and residual Effects of reduced lithium content, improved cycle performance, and improved processability

Active Publication Date: 2019-01-15
陕西红马科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are certain problems in coating another positive electrode material on the surface of one positive electrode material: the sintering temperature and sintering atmosphere of the two materials are often different, the sintering temperature may differ by hundreds of degrees, and the sintering atmosphere may be an oxygen atmosphere and the other It is a nitrogen atmosphere, which leads to low feasibility of the precursor coating method, so the sol-gel method or mechanical coating (such as ball milling, fusion machine grinding, etc.) is often used.
The problem with the sol-gel method is that the cost is high; the problem with the ball milling method is that the uniformity cannot be guaranteed, and it will destroy the particle size and shape of the coated material, and generate a large number of broken particles, resulting in a decrease in material performance; the output of fusion mechanical grinding is small And the particle size requirements of the coating material are stricter and the cost is higher

Method used

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  • A preparation method of a nickel-rich ternary material coated with cobalt lithium phosphate
  • A preparation method of a nickel-rich ternary material coated with cobalt lithium phosphate
  • A preparation method of a nickel-rich ternary material coated with cobalt lithium phosphate

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Embodiment 1

[0032] The nickel-rich ternary material used is LiNi in the prior art 0.6 co 0.2 mn 0.2 o 2 powder (referred to as NCM622 powder).

[0033] 1. A method for preparing a nickel-rich ternary material coated with lithium cobalt phosphate, comprising the following steps:

[0034] (1) Cobalt hydroxide coated on the surface of nickel-rich ternary material:

[0035] (1a) Cobalt sulfate (CoSO 4 ·7H 2 O) Dissolved in pure water to prepare 0.62L of cobalt sulfate salt solution of 0.1mol / L;

[0036] (1b) Add sodium hydroxide and ammonia water to pure water to prepare 0.62L of mixed alkali solution with concentrations of 0.2mol / L and 0.01mol / L respectively;

[0037] (1c) In a nitrogen atmosphere, 2000 g of LiNi 0.6 co 0.2 mn 0.2 o 2 Add 5L of pure water into the reaction kettle and stir evenly, then add the cobalt sulfate salt solution and mixed alkali solution prepared in steps (1a) and (1b), control the temperature of the reaction kettle to 50°C, pH=10.8, and obtain cobalt hyd...

Embodiment 2

[0042] The nickel-rich ternary material used is LiNi in the prior art 0.6 co 0.2 mn 0.2 o 2 powder.

[0043] 1. A method for preparing a nickel-rich ternary material coated with lithium cobalt phosphate, comprising the following steps:

[0044] (1) Cobalt hydroxide coated on the surface of nickel-rich ternary material:

[0045] (1a) Cobalt sulfate (CoSO 4 ·7H 2 O) Dissolved in pure water to prepare 0.62L of cobalt sulfate salt solution of 0.05mol / L;

[0046] (1b) Add sodium hydroxide and ammonia water to pure water to prepare 0.62L of mixed alkali solution with concentrations of 0.1mol / L and 0.05mol / L respectively;

[0047] (1c) In a nitrogen atmosphere, 2000 g of LiNi 0.6 co 0.2 mn0.2 o 2 (abbreviated as NCM622 powder) and 5L of pure water were added to the reactor and stirred evenly, then the cobalt sulfate salt solution and mixed alkali solution prepared in steps (1a) and (1b) were added, and the temperature of the reactor was controlled at 40°C and pH=12 to obta...

Embodiment 3

[0052] The nickel-rich ternary material used is LiNi in the prior art 0.6 co 0.2 mn 0.2 o 2 powder.

[0053] 1. A method for preparing a nickel-rich ternary material coated with lithium cobalt phosphate, comprising the following steps:

[0054] (1) Cobalt hydroxide coated on the surface of nickel-rich ternary material:

[0055] (1a) Cobalt sulfate (CoSO 4 ·7H 2 O) Dissolved in pure water to prepare 0.62L of cobalt sulfate salt solution of 0.5mol / L;

[0056] (1b) Add sodium hydroxide and ammonia water to pure water to prepare 0.62L of mixed alkali solution with concentrations of 1mol / L and 0.005mol / L respectively;

[0057] (1c) In a nitrogen atmosphere, 2000 g of LiNi 0.6 co 0.2 mn 0.2 o 2 (abbreviated as NCM622 powder) and 5L of pure water were added to the reactor and stirred evenly, then the cobalt sulfate salt solution and mixed alkali solution prepared in steps (1a) and (1b) were added, and the temperature of the reactor was controlled at 60°C and pH=9 to obtai...

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Abstract

The invention provides a preparation method of a nickel-rich ternary material coated with cobalt lithium phosphate, comprising the following steps: (1) coating cobalt hydroxide on the surface of the nickel-rich ternary material; (2) high-temperature treatment: uniformly mixing lithium hydroxide, phosphate and the powder obtained in the step (1), roasting in an inert atmosphere, cooling, and pulverizing to obtain the ternary material powder coated with cobalt lithium phosphate. The preparation method provided by the invention has the advantages of low sintering temperature, no damage to the performance of the nickel-rich ternary material, stability of the coated nickel-rich ternary material to the water and carbon dioxide in the air, greatly improving the processing performance of the material, improving the cycling performance of the prepared nickel-rich ternary material, and lowering the pH value and the residual lithium content.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a preparation method of a nickel-rich ternary material coated with lithium cobalt phosphate. Background technique [0002] At present, the most widely used cathode material for lithium-ion batteries is the ternary layered compound of nickel-cobalt-lithium-manganese oxide, that is, the ternary material. With the continuous update and development of various electronic products, people have higher and higher requirements for lithium-ion batteries: battery life, longer service life, smaller size, lighter weight, etc. Nickel-rich ternary materials have been widely used due to their high capacity. However, nickel-rich ternary materials have high surface activity, resulting in poor processability. For this problem of nickel-rich ternary materials, the main solution at present is to coat the materials. [0003] At present, the materials used for cladd...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M4/505H01M4/525C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/366H01M4/505H01M4/525H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 高彦宾
Owner 陕西红马科技有限公司
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