Method for reducing surface alkali content of lithium battery positive electrode material

A technology of surface alkali content and positive electrode material, applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve problems such as failure to meet the use requirements of power batteries, decrease in rate and cycle performance of positive electrode materials, and increase in cost, and achieve improvement. Crystal structure, avoidance of element loss, effect of improving crystallinity

Pending Publication Date: 2022-07-22
兰州金通储能动力新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can thoroughly clean the residual alkali on the surface, but its disadvantages are also very obvious. After the treatment, the rate and cycle performance of the positive electrode material are significantly reduced and cannot meet the requirements of the power battery. increased cost

Method used

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  • Method for reducing surface alkali content of lithium battery positive electrode material
  • Method for reducing surface alkali content of lithium battery positive electrode material
  • Method for reducing surface alkali content of lithium battery positive electrode material

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Embodiment 1

[0036] Embodiment 1: a method for reducing the alkali content on the surface of the positive electrode material of a lithium battery, including the following steps in sequence:

[0037] Step 1. In the preparation of Ni, the precursor of the positive electrode material for lithium ion batteries 0.7 Co 0.1 Mn 0.2 (OH) 2 After the co-precipitation reaction is completed, the pH is adjusted to 12.50 with sodium hydroxide, aged for 60 min, and then the lithium battery cathode material precursor Ni is removed with a filter press. 0.7 Co 0.1 Mn0.2 (OH) 2 in the mother liquor;

[0038] Step 2, remove the lithium battery cathode material precursor Ni from the mother liquor in the medium pressure filter in step 1 0.7 Co 0.1 Mn 0.2 (OH) 2 Carry out 2~4 times of circulating water washing, the washing temperature is 75 ℃, and then the water content is pressed to 15%. The quality of pure water used in each washing is 6 times that of the lithium battery cathode material precursor, an...

Embodiment 2

[0045] Embodiment 2: a method for reducing the alkali content on the surface of the positive electrode material of a lithium battery, including the following steps in sequence:

[0046] Step 1. In the preparation of Ni, the precursor of the positive electrode material for lithium ion batteries 0.85 Co 0.05 Mn 0.10 (OH) 2 After the co-precipitation reaction is completed, the pH is adjusted to 12.50 with sodium hydroxide, aged for 60 min, and then the lithium battery cathode material precursor Ni is removed with a filter press. 0.85 Co 0.05 Mn 0.10 (OH) 2 in the mother liquor;

[0047] Step 2, remove the lithium battery cathode material precursor Ni from the mother liquor in the medium pressure filter in step 1 0.85 Co 0.05 Mn 0.10 (OH) 2 Carry out 2~4 times of circulating water washing, the washing temperature is 75 ℃, and then the water content is pressed to 15%. The quality of pure water used in each washing is 6 times that of the lithium battery cathode material pr...

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Abstract

A method for reducing the surface alkali content of a lithium battery positive electrode material comprises the following steps: 1, adding sodium hydroxide after a coprecipitation reaction is finished, adjusting the pH value, aging, and carrying out filter pressing to remove mother liquor; 2, performing circulating water washing on the precursor, and controlling moisture; 3, adding pure water into an aging kettle, starting stirring, adding the precursor into the aging kettle, adding acid to adjust the pH value, adding citric acid, and aging; 4, carrying out filter pressing on the slurry in the aging kettle to remove mother liquor, carrying out cyclic alkali washing, and controlling moisture; 5, carrying out circulating washing on the obtained precursor, and controlling the moisture; and 6, drying, sieving and deironing the obtained precursor to obtain a precursor product, uniformly mixing the precursor product with a lithium source, and calcining to obtain the lithium battery positive electrode material. Compared with the prior art, the method has the advantages that the alkali content on the surface of the material can be effectively reduced, the multiplying power and the cycle performance of the positive electrode material are ensured, and the method is simpler, suitable for large-scale application and lower in cost.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a method for reducing the alkali content on the surface of positive electrode materials for lithium batteries. Background technique [0002] With the increasingly serious pollution caused by fossil fuels, people's demand for clean energy is becoming more and more urgent. In order to replace fuel vehicles, the market share of new energy vehicles has also become higher and higher, which has also led to an increase in the demand for cathode materials for lithium-ion batteries. [0003] As one of the important indicators of lithium battery cathode materials, the alkali content has a very important influence on the electrical properties. The higher the alkali content, the easier it is to form a jelly during the pulping process, resulting in pulping failure. In addition, high alkali content is one of the main reasons for battery flatulen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/525H01M10/0525C01G53/00
CPCH01M4/04H01M4/525H01M10/0525C01G53/44C01P2006/80
Inventor 李加闯朱用黄帅杰王梁梁
Owner 兰州金通储能动力新材料有限公司
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