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A kind of ncm ternary cathode material with surface layer lithium concentration gradient and preparation method thereof

A cathode material and concentration gradient technology, which is applied in the field of NCM ternary cathode material and its preparation, can solve the problems of limited effect and no problem, so as to improve the active lithium content, improve the discharge specific capacity, overcome the discharge specific capacity and Effects of Cyclic Stability

Active Publication Date: 2022-06-28
北京理工大学重庆创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Correspondingly, this patented technology forms a microgradient structure by covering the surface of the positive electrode material with doping elements, which still does not solve the problem of uniform distribution of lithium ions, so its effect is limited

Method used

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  • A kind of ncm ternary cathode material with surface layer lithium concentration gradient and preparation method thereof
  • A kind of ncm ternary cathode material with surface layer lithium concentration gradient and preparation method thereof
  • A kind of ncm ternary cathode material with surface layer lithium concentration gradient and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] A preparation method of NCM ternary positive electrode material with surface layer lithium concentration gradient, comprising the following steps:

[0038] S1, 5mL of citric acid was added to 50mL of solvent, stirred and mixed evenly at 60°C, and the stirring time was 10min to obtain a mixed solution;

[0039] S2, put 20g of NCM ternary cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 Join in the mixed solution that S1 obtains, continue to maintain the stirring temperature of 60 ℃, soak time is 10min, obtain suspension;

[0040] S3, S2 gained suspension under reduced pressure suction filtration, obtains solid filter material;

[0041] S4. The solid filter material is placed in a tube furnace, and the temperature is controlled in an oxygen atmosphere for heat treatment at 600°C for 10 hours to obtain an NCM ternary cathode material with a surface lithium concentration gradient.

[0042] Scanning electron microscopy results of the final product as figure 1 As can be seen...

Embodiment 2

[0046] A preparation method of NCM ternary positive electrode material with surface layer lithium concentration gradient, comprising the following steps:

[0047] S1, 1mL of maleic acid was added to 50mL of solvent, stirred and mixed at 50°C, and the stirring time was 30min to obtain a mixed solution;

[0048] S2, put 20g of NCM ternary cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 Join in the mixed solution that S1 obtains, continue to maintain the stirring temperature of 50 ℃, soak time is 30min, obtain suspension;

[0049] S3, S2 gained suspension under reduced pressure suction filtration, obtains solid filter material;

[0050] S4. The solid filter material is placed in a tube furnace, and the temperature is controlled in an oxygen atmosphere for heat treatment at 400°C for 20 hours to obtain an NCM ternary cathode material with a surface lithium concentration gradient.

Embodiment 3

[0052] A preparation method of NCM ternary positive electrode material with surface layer lithium concentration gradient, comprising the following steps:

[0053] S1, the tartaric acid of 10mL is added in 50mL solvent, at 80 DEG C, stirring and mixing, stirring time is 10min, obtains mixed solution;

[0054] S2, put 20g of NCM ternary cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 Add to the mixed solution obtained by S1, continue to maintain the stirring temperature of 80 ° C, and the soaking time is 30 min to obtain a suspension;

[0055] S3, S2 gained suspension under reduced pressure suction filtration, obtains solid filter material;

[0056] S4. The solid filter material is placed in a tube furnace, and the temperature is controlled in an oxygen atmosphere for heat treatment at 800° C. for 5 hours to obtain an NCM ternary cathode material with a surface layer lithium concentration gradient.

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Abstract

The invention discloses an NCM ternary positive electrode material with surface lithium concentration gradient and a preparation method thereof, comprising the following steps: S1, mixing a weak acid and a solvent to prepare a weak acid solution; S2, adding the NCM ternary positive electrode material into the weak acid solution , stirred and reacted at 50-80°C to obtain a suspension, and the suspension was filtered under reduced pressure to obtain a solid filter material; S3, the solid filter material was placed in a tube furnace, and heated at 400-800°C in an oxygen atmosphere Under heat treatment for 5‑20h. In the present invention, the NCM ternary positive electrode material is first reacted with a weak acid, heat-treated by proton exchange, and Li is constructed on the surface of the NCM ternary material + concentration gradient, thus accelerating the Li + Diffusion within the material, Li + The rapid movement of the material helps to increase the active lithium content of the material as a whole, and it can also reduce the Li + The lattice distortion caused by diffusion alleviates the drastic change of lattice parameters and improves the cycle stability of the material.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an NCM ternary positive electrode material with a surface layer lithium concentration gradient and a preparation method thereof. Background technique [0002] Fossil energy such as coal and oil are widely used as the main body of my country's current energy structure, but the extensive use and over-reliance on fossil energy is not conducive to the development of my country's energy industry, and the problem of environmental pollution is difficult to solve. Therefore, the development of green new energy forms is The development direction of my country's energy industry. Electric energy is a kind of secondary energy that can be used directly, and covers almost all aspects of social development, so new energy forms such as solar energy, geothermal energy, water energy, etc. are usually converted into electric energy and utilized. With the rapid development of electric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 陈来张其雨苏岳锋聂启军卢赟李宁曹端云黄擎吴锋
Owner 北京理工大学重庆创新中心
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