A method for removing sulfur and sodium from ternary precursor

A precursor, ternary technology, applied in chemical instruments and methods, electrical components, nickel compounds, etc., can solve the problem of high sodium content and sulfur content, achieve high-efficiency content, reduce content, and weaken the effect of interlayer force

Active Publication Date: 2022-04-22
南通金通储能动力新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for removing sulfur and sodium from a ternary precursor, the purpose of which is to solve the problem that the sodium content and sulfur content in the existing ternary precursor are too high

Method used

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  • A method for removing sulfur and sodium from ternary precursor
  • A method for removing sulfur and sodium from ternary precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Step 1: 1 t of newly produced NCM523 ternary precursor raw material with a particle size greater than 8 μm is separated from solid and liquid by a filter press and washed;

[0029] The second step: unload the sample treated in the first step to a storage area of ​​1 m 3 In a slurry tank of pure water, stir and soak for 3 h;

[0030] Step 3: Wash the samples treated in the second step with pure water once and once with caustic soda solution with a concentration of 0.35 mol / L;

[0031] Step 4: Wash the sample treated in the third step with pure water, dry it and send it for Na and S inspection;

Embodiment 2

[0032] Example 2: Step 1: 1 t of newly produced solid granular NCM523 ternary precursor raw material with a particle size larger than 8 μm is separated from solid and liquid by a filter press and washed;

[0033] The second step: unload the sample treated in the first step to contain 1 m 3 , in a slurry tank with a volume concentration of 30% formamide aqueous solution, stirring and soaking for 3 h;

[0034] Step 3: Wash the samples treated in the second step with pure water once and once with caustic soda solution with a concentration of 0.35 mol / L;

[0035] Step 4: Wash the sample treated in the third step with pure water and dry it for Na, S inspection;

Embodiment 3

[0036] Example 3: Step 1: 1 t of newly produced solid granular NCM523 ternary precursor raw material with a particle size of 10±0.5 μm is separated from solid and liquid by a filter press and washed;

[0037] The second step: wash the sample treated in the first step with a caustic soda solution with a concentration of 0.35 mol / L, and the washing temperature is 50°C;

[0038] The third step: wash the sample treated in the second step with pure water and dry it for Na, S inspection;

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Abstract

The invention relates to a method for removing sulfur and sodium during the washing process of a ternary precursor. This method takes the newly produced solid granular nickel-cobalt-manganese ternary precursor raw material as the object, and increases the distance between the ternary precursor sheets through the force between the formamide molecule and the ternary precursor layer. , weaken the interlayer force, and reduce the SO present in the interlayer of the ternary precursor by washing at room temperature 4 2‑ 、Na + , reducing the content of impurities Na and S in the ternary precursor, improving the washing efficiency of ternary precursor raw materials, sulfate and sodium ions, and reducing the content of interlayer impurities, sulfate and sodium ions.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a method for removing sulfur and sodium from a ternary precursor. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, separators, and electrolytes. Cathode materials account for more than 40% of the total cost of lithium batteries, and the performance of cathode materials directly affects various performance indicators of lithium batteries. The ternary precursor is the main raw material of the ternary cathode material, in other words, the quality of the ternary precursor directly determines the performance of the ternary cathode material. [0003] In addition to the conventional tap density, specific surface area, and morphology parameters of the ternary precursor, the impurities contained in the product will also affect the production and performance of the ternary cathode material,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/04H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M4/04H01M10/0525C01G53/006H01M2004/028Y02E60/10
Inventor 孙源张振兴杨超黄攀顾春芳朱用王梁梁赵亮
Owner 南通金通储能动力新材料有限公司
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