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Method for coating positive electrode material precursor with tin base and positive electrode material precursor

A cathode material and precursor technology, applied in the field of lithium battery cathode materials, can solve problems such as hindering the migration rate of lithium ions, decreasing the electrochemical performance of cathode materials, and increasing the resistivity of cathode materials.

Pending Publication Date: 2022-07-29
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the coatings used in the existing methods for preparing positive electrode material precursors containing coating layers are mostly oxide materials with low electronic conductivity, thus increasing the resistivity of the positive electrode material; and the prepared The coating layer on the cathode material precursor is too dense, which hinders the migration rate of lithium ions and reduces the electrochemical performance of the final cathode material.

Method used

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  • Method for coating positive electrode material precursor with tin base and positive electrode material precursor
  • Method for coating positive electrode material precursor with tin base and positive electrode material precursor
  • Method for coating positive electrode material precursor with tin base and positive electrode material precursor

Examples

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Embodiment 1

[0047] A method for tin-based coating of a positive electrode material precursor, comprising the following steps:

[0048] S1. prepare a stannous chloride solution with a concentration of 0.5 mol / L;

[0049] S2. prepare the mixed solution of sodium carbonate and sodium sulfide, wherein the sodium carbonate concentration is 0.5mol / L, and the sodium sulfide concentration is 0.5mol / L;

[0050] S3. The nickel cobalt manganese hydroxide (molecular formula: Ni 0.62 Mn 0.2 Co 0.18 (OH) 2 ) is added to the mixed solution prepared in step (2) according to the solid-to-liquid ratio 1g:3mL;

[0051] S4. under the constant stirring that the stirring speed is 300r / min, the stannous chloride solution prepared in step (1) is added dropwise to the mixed solution, and the dropping rate is 35mL / h;

[0052] S5. When it is detected that the pH of the mixed solution is 8-9, the reaction is stopped, and solid-liquid separation is carried out to obtain a wet material;

[0053] S6. According to...

Embodiment 2

[0058] A method for tin-based coating of a positive electrode material precursor, comprising the following steps:

[0059] S1. prepare a stannous chloride solution with a concentration of 0.01 mol / L;

[0060] S2. prepare a mixed solution of sodium carbonate and sodium sulfide, wherein the sodium carbonate concentration is 0.1 mol / L, and the sodium sulfide concentration is 0.1 mol / L;

[0061] S3. The hydroxide of nickel cobalt manganese (molecular formula: Ni 0.62 Mn 0.2 Co 0.18 (OH) 2 ) is added to the mixed solution prepared in step (2) according to the solid-to-liquid ratio 1g:1mL;

[0062] S4. Under the constant stirring that the stirring speed is 200r / min, the stannous chloride solution prepared in step (1) is added dropwise to the mixed solution, and the dropping rate is 25mL / h;

[0063] S5. When it is detected that the pH of the mixed solution is 8-9, the reaction is stopped, and solid-liquid separation is carried out to obtain a wet material;

[0064] S6. Accordin...

Embodiment 3

[0069] A method for tin-based coating of a positive electrode material precursor, comprising the following steps:

[0070] S1. prepare a stannous sulfate solution with a concentration of 1 mol / L;

[0071] S2. prepare the mixed solution of sodium carbonate and sodium sulfide, wherein the sodium carbonate concentration is 1.0mol / L, and the sodium sulfide concentration is 1.0mol / L;

[0072] S3. The hydroxide of nickel cobalt manganese (molecular formula: Ni 0.85 Mn 0.08 Co 0.7 (OH) 2 ) is added to the mixed solution prepared in step (2) according to the solid-to-liquid ratio 1g:5mL;

[0073] S4. Under the constant stirring that the stirring speed is 500r / min, the stannous sulfate solution prepared in step (1) is added dropwise to the mixed solution, and the dropping rate is 50mL / h;

[0074] S5. When it is detected that the pH of the mixed solution is 8-9, the reaction is stopped, and solid-liquid separation is carried out to obtain a wet material;

[0075] S6. According to ...

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Abstract

The invention discloses a method for coating a positive electrode material precursor with a tin base. The method comprises the following steps: (1) mixing nickel-cobalt-manganese hydroxide with a solution containing carbonate ions and sulfur ions; (2) adding a stannous source solution into the mixed solution in the step (1) for reaction and solid-liquid separation to obtain a solid product; and (3) soaking the solid product obtained in the step (2) in a persulfide salt solution, carrying out solid-liquid separation, washing, and drying to obtain the positive electrode material precursor. The positive electrode material prepared from the positive electrode material precursor prepared by the preparation method has excellent conductivity and lithium ion migration rate, so that the positive electrode material has relatively good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium batteries, and particularly relates to a method for coating a positive electrode material precursor with a tin base and the positive electrode material precursor. Background technique [0002] As a new type of green power supply, lithium-ion batteries have been widely used in consumer electronic products and new field of energy vehicles. The positive electrode material is one of the core parts of the lithium-ion battery, which determines the performance of the lithium-ion battery. The positive electrode material limits the energy density, power density and cycle life of the lithium-ion battery. It can be said that the development of cathode materials determines the development direction of lithium-ion batteries. [0003] With the rapid development of electric vehicles, smart electronic devices, and other fields, there is an urgent need for high-energy-density lit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/505H01M4/525
CPCH01M4/387H01M4/505H01M4/525H01M4/366Y02E60/10C01G51/04C01G19/00C01G19/006C01G19/02C01G51/50H01M10/0525
Inventor 余海军谢英豪李爱霞张学梅李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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