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Preparation method of preoxidation modified high-nickel ternary cathode material

A positive electrode material and pre-oxidation technology, applied in chemical instruments and methods, positive electrodes, active material electrodes, etc., can solve the problems of increased cation mixing, affecting the capacity and cycle performance of high-nickel materials, and achieve reversible capacity increase, improve The first effect and cycle performance, the effect of reducing the degree of mixing of lithium and nickel

Inactive Publication Date: 2018-09-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increase of Ni content in the high-nickel precursor, the cation mixing will increase during the sintering stage, which will affect the capacity and cycle performance of the high-nickel material.

Method used

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  • Preparation method of preoxidation modified high-nickel ternary cathode material
  • Preparation method of preoxidation modified high-nickel ternary cathode material
  • Preparation method of preoxidation modified high-nickel ternary cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A kind of preparation method of the high-nickel ternary cathode material that the present invention proposes, comprises the steps:

[0028] S1, 100g high-nickel ternary precursor material Ni 0.85 co 0.1 mn 0.05 (OH) 2 Dissolve 0.5g of manganese nitrate in a deionized water solvent, control the solid content at 30wt% to obtain a slurry; stir the slurry for 1h, then spray dry, and pre-sinter at 400°C for 5h in an air atmosphere to obtain preoxidized High nickel ternary precursor material;

[0029] S2. Mix the pre-oxidized high-nickel ternary precursor material with lithium hydroxide at a Li / Ni molar ratio of 1.03:1, and sinter at 780°C for 15 hours in a pure oxygen atmosphere to obtain pre-oxidized modified high-nickel Ternary cathode material LiNi 0.85 co 0.1 mn 0.05 o 2 ;

[0030] Carry out XRD and SEM test to the high-nickel ternary positive electrode material of pre-oxidation modification obtained in this embodiment, its XRD is as follows figure 1 As shown, ...

Embodiment 2

[0036] A kind of preparation method of the high-nickel ternary cathode material that the present invention proposes, comprises the steps:

[0037] S1, 100g high-nickel ternary precursor material Ni 0.85 co 0.1 mn 0.05 (OH) 2 Dissolve 2g of cobalt nitrate in an ethanol solvent, control the solid content at 50wt% to obtain a slurry; stir the slurry for 2 hours, then dry it by rotary evaporation, and pre-sinter at 500°C for 3 hours in a pure oxygen atmosphere to obtain a pre-oxidized high Nickel ternary precursor material;

[0038] S2. Mix the pre-oxidized high-nickel ternary precursor material with lithium nitrate according to the Li / Ni molar ratio of 1.05:1, and sinter at 730°C for 20 hours in a pure oxygen atmosphere to obtain a pre-oxidized modified high-nickel ternary Cathode material.

Embodiment 3

[0040] A kind of preparation method of the high-nickel ternary cathode material that the present invention proposes, comprises the steps:

[0041] S1, 100g high-nickel ternary precursor material Ni 0.8 co 0.1 mn 0.1 (OH) 2 Dissolve 5g of potassium nitrate in a deionized water solvent, control the solid content at 40wt% to obtain a slurry; stir the slurry for 2 hours, then dry it by rotary evaporation, and pre-sinter at 500°C for 10 hours in a pure oxygen atmosphere to obtain pre-oxidation High-nickel ternary precursor material;

[0042] S2. Mix the pre-oxidized high-nickel ternary precursor material with lithium carbonate according to the Li / Ni molar ratio of 1.05:1, and sinter at 760°C for 15 hours in a pure oxygen atmosphere to obtain a pre-oxidized modified high-nickel ternary Cathode material.

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Abstract

The invention discloses a preparation method of a preoxidation modified high-nickel ternary cathode material. The preparation method comprises the following steps of mixing a high-nickel ternary precursor material, nitrate and a solvent to obtain slurry; sequentially performing drying and presintering on the slurry to obtain a pre-oxidized high-nickel ternary precursor material, wherein a chemicalformula of the pre-oxidized high-nickel ternary precursor material is NixCoyM1-x-y(OH)2, and x is greater than or equal to 0.80; and mixing the pre-oxidized high-nickel ternary precursor material anda lithium source, and performing sintering to obtain the preoxidation modified high-nickel ternary cathode material LiNixCoyM1-x-yO2, wherein x is greater than or equal to 0.80. By adopting the preparation method of the preoxidation modified high-nickel ternary cathode material provided by the invention, a cation mixed arrangement degree in a layered structure of the high-nickel ternary cathode material is lowered, and the initial effect, the capacity and the cycle performance of the high-nickel ternary cathode material are improved at the same time.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a pre-oxidized modified high-nickel ternary positive electrode material. Background technique [0002] With the promotion of new energy vehicles, power lithium-ion batteries have been greatly developed. At the same time, new energy vehicles have high requirements for mileage, and there are also high requirements for energy density, high cycle performance and high safety performance of lithium-ion batteries. Require. At present, the main research direction is to increase the gram capacity of the material, and the high-nickel ternary material has become the focus of attention of the positive electrode material because of its high capacity. In order to achieve a battery with high energy density, it is necessary to use high-nickel materials with higher capacity to achieve it. [0003] For high nickel ternary material LiNi x co y m 1-x-y o 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCC01G53/006C01P2002/72C01P2004/03H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 陈方高玉仙李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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