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Preparation method of ternary positive electrode material with low residual alkali content and high capacity retention ratio

A cathode material, high-capacity technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of limited large-scale application, high nickel material rate and cycle performance decline, capacity attenuation, etc., to simplify the cathode calcination process, improve Circulation retention rate, the effect of reducing excess moisture

Active Publication Date: 2022-03-15
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

A high total alkali content means that there are more lithium residues on the surface of the particles, which can easily absorb carbon dioxide and water in the air and form Li on the surface of the particles. 2 CO 3 and LiOH layer, which consumes Li in the material and is not electrochemically active, so it will cause capacity fading
[0004] Aiming at the problem of high residual alkali content, the process of washing high-nickel materials with water and then secondary sintering at a lower temperature is commonly used at present to reduce the surface residual alkali content of high-nickel materials, but the high-nickel materials after treatment The rate and cycle performance of nickel materials are significantly reduced, which limits its large-scale application

Method used

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  • Preparation method of ternary positive electrode material with low residual alkali content and high capacity retention ratio
  • Preparation method of ternary positive electrode material with low residual alkali content and high capacity retention ratio
  • Preparation method of ternary positive electrode material with low residual alkali content and high capacity retention ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]Step 1. Dehydrate the nickel-cobalt-manganese hydroxide precursor with a metal element ratio of 85:05:10 after synthesis until the water content is 13%;

[0048] Step 2. Dry the nickel-cobalt-manganese hydroxide precursor with 13% moisture and metal element ratio of 85:05:10 at 180°C, measure the half-peak width, and obtain the process product;

[0049] Step 3. The process product obtained in step 2 is calcined at 300°C, 450°C, and 600°C for 30 minutes respectively, and washed and dried to obtain a ternary precursor;

[0050] Step 4. Mix the ternary precursor obtained in step 3 with lithium hydroxide according to the lithium ratio of 1.05, and sinter in the same process as in Comparative Example 1 to obtain a ternary positive electrode material.

Embodiment 2

[0052] Step 1. Dehydrate the nickel-cobalt-manganese hydroxide precursor with a metal element ratio of 85:05:10 after synthesis until the water content is 13%;

[0053] Step 2. Dry the nickel-cobalt-manganese hydroxide precursor with a water content of 13% and a metal element ratio of 85:05:10 at 180°C, measure the half-peak width, and soak in a mixed solution of ammonia water and ammonium nitrate for 1 hour , and then centrifugally washed and dried at 180°C to obtain the process product;

[0054] Step 3. Calcining the process product obtained in Step 2 at 300° C., 450° C., and 600° C. for 30 minutes respectively, washing and drying with water to obtain a ternary precursor.

[0055] Step 4. Mix the ternary precursor obtained in step 3 with lithium hydroxide according to the lithium ratio of 1.05, and sinter in the same process as in Comparative Example 1 to obtain a ternary positive electrode material.

Embodiment 3

[0057] Step 1. Dehydrate the nickel-cobalt-manganese hydroxide precursor with a metal element ratio of 96:02:02 after synthesis until the water content is 12%;

[0058] Step 2. Dry the nickel-cobalt-manganese hydroxide precursor with 12% moisture and metal element ratio of 96:02:02 at 180°C, and measure the half-peak width in a mixed solution of sodium carbonate and sodium hydroxide Soak for 2 hours, then perform centrifugal washing, and dry at 180°C to obtain the process product;

[0059] Step 3. Calcining the process product obtained in step 2 at 300°C, 450°C, and 600°C for 30 minutes respectively, washing and drying with water to obtain a ternary precursor;

[0060] Step 4. Mix the ternary precursor obtained in step 3 with lithium hydroxide according to the lithium ratio of 1.05, and sinter in the same process as in Comparative Example 1 to obtain a ternary positive electrode material.

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Abstract

The invention relates to a preparation method of a ternary positive electrode material with low residual alkali content and high capacity retention ratio, which comprises the following steps of: 1, dehydrating nickel-cobalt-manganese hydroxide to obtain nickel-cobalt-manganese hydroxide with the general formula of Ni1-x-yCoxMny (OH) 2, 0 < = x < 1, 0 < = y < 1, and 0 < x + y < = 0.2; 2, drying the nickel-cobalt-manganese hydroxide at the temperature of less than 210 DEG C, and selectively using a crystallinity regulator for immersion cleaning according to FWHM (001) to obtain a product of which the FWHM (001) is more than or equal to 0.30 and less than or equal to 0.60; and 3, carrying out high-temperature calcination on the product to obtain a ternary precursor with the general formula of Ni < 1-x-y > Co < x > Mn < y > O < Z > and the FWHM (111) being more than or equal to 0.60 and less than or equal to 0.80, and mixing lithium and sintering to obtain the positive electrode material. According to the invention, the ternary precursor with uniform crystallinity can be obtained, and the problems of high residual alkali content of the high-nickel ternary precursor and low circularity of the high-nickel positive electrode are solved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium batteries, in particular to a method for preparing a ternary positive electrode material with low residual alkali and high capacity retention. Background technique [0002] Lithium battery ternary cathode material is known as the material of choice for lithium batteries because of its low price and stable performance. High energy density is the biggest advantage. As the nickel content increases, the specific capacity of the ternary cathode material gradually increases, and the energy density of the battery will also increase accordingly. At present, the cathode material for domestic power lithium batteries is mainly NCM523, and the energy density of its cells reaches 160~200wh / kg. The high-nickel ternary cathode material increases the number of reactable electrons in the battery, thereby increasing the energy density of the battery. The energy density of the battery cell is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 李佰康张文静朱用程春雷黄帅杰朱涛顾春芳
Owner 南通金通储能动力新材料有限公司
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