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Preparation method of lithium cobalt nickel manganese oxide cathode material

A technology of nickel-cobalt-lithium-manganese-manganese oxide and cathode materials, which is applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of nickel-cobalt-lithium-manganese oxide performance impact and battery performance, and achieve performance improvement and capacity attenuation The effect of low rate and increased cycle charge and discharge times

Inactive Publication Date: 2019-02-01
贵州永合益环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of nickel-cobalt-lithium-manganese-oxide material, the change of its process parameters, the ratio of small molecular organic components used and the selection of raw material components will have an impact on the performance of the prepared nickel-cobalt-lithium manganese oxide. Then affect the performance of the battery when nickel cobalt lithium manganese oxide is used as the positive electrode material to a great extent; and the nickel cobalt lithium manganese oxide positive electrode material obtained by the nickel cobalt lithium manganate preparation method in the prior art is still unsatisfactory, for nickel The preparation of lithium cobalt manganese oxide material is still the key direction of continuous research and overcoming by those skilled in the art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation method of nickel cobalt lithium manganese oxide cathode material comprises the following steps:

[0021] (1) Dissolve lithium hydroxide, nickel nitrate, cobalt sulfate, and manganese chloride in water-organic solvent at a molar ratio of lithium, nickel, cobalt, and manganese of 1:0.3:0.6:0.5 to form a metal solution; water - In the organic solvent mixture, water accounts for 50% of the total mass of the mixture;

[0022] (2) Mix diammonium hydrogen phosphate, ammonium carbonate, urea, and water into an aqueous solution, and in the aqueous solution, diammonium hydrogen phosphate is 4g / L, ammonium carbonate is 1g / L, and urea is 2g / L, and the aqueous solution is preheated to 80°C;

[0023] (3) Add silica molecular sieves to the entering solution prepared in step (1), and stir evenly to obtain a mixed solution; then, under magnetic stirring, add the aqueous solution prepared in step (2) to the mixed solution, and magnetically stir for 4 hours, Obtain precu...

Embodiment 2

[0029] The difference from Example 1 is: the preparation method of nickel-cobalt lithium manganese oxide positive electrode material, comprising the following steps:

[0030] (1) Dissolve lithium hydroxide, nickel nitrate, cobalt sulfate, and manganese chloride in water-organic solvent at a molar ratio of lithium, nickel, cobalt, and manganese of 1:0.4:0.6:0.5 to form a metal solution; water - In the organic solvent mixture, water accounts for 70% of the total mass of the mixture;

[0031] (2) Mix diammonium hydrogen phosphate, ammonium carbonate, urea, and water into an aqueous solution, and in the aqueous solution, diammonium hydrogen phosphate is 7g / L, ammonium carbonate is 3g / L, and urea is 4g / L, and the aqueous solution is preheated to 90°C;

[0032] (3) Add silica molecular sieves to the entering solution prepared in step (1), and stir evenly to obtain a mixed solution; then, under magnetic stirring, add the aqueous solution prepared in step (2) to the mixed solution, a...

Embodiment 3

[0037] The difference from Example 1 is: the preparation method of nickel-cobalt lithium manganese oxide positive electrode material, comprising the following steps:

[0038] (1) Dissolve lithium hydroxide, nickel nitrate, cobalt sulfate, and manganese chloride in water-organic solvent at a molar ratio of lithium, nickel, cobalt, and manganese of 1:0.35:0.6:0.5 to form a metal solution; water - In the organic solvent mixture, water accounts for 60% of the total mass of the mixture;

[0039] (2) Mix diammonium hydrogen phosphate, ammonium carbonate, urea, and water into an aqueous solution, and in the aqueous solution, diammonium hydrogen phosphate is 5g / L, ammonium carbonate is 2g / L, and urea is 3g / L, and the aqueous solution is preheated to 85°C;

[0040] (3) Add silica molecular sieves to the entering solution prepared in step (1), and stir evenly to obtain a mixed solution; then, under magnetic stirring, add the aqueous solution prepared in step (2) to the mixed solution, ...

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PUM

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Abstract

The invention relates to the technical field of battery cathode materials and especially provides a preparation method of a lithium cobalt nickel manganese oxide cathode material. By selecting the rawmaterials during preparation of the lithium cobalt nickel manganese oxide cathode material and reasonably selecting and proportioning water solutions and organic solvents during treatment, the performance of the cathode material is effectively improved. The cathode material has stable charge-discharge property and low capacity attenuation rate, is increased in cyclic charge-discharge times and isprolonged in service life.

Description

technical field [0001] The invention relates to the technical field of battery cathode materials, in particular to a method for preparing nickel-cobalt lithium manganese oxide cathode materials. Background technique [0002] At present, the commonly used methods for preparing lithium nickel cobalt manganese oxide include high-temperature solid-phase method and co-precipitation-high-temperature solid-phase method. The high-temperature solid-phase method is to uniformly ball-mill the nickel source, cobalt source, manganese source, and lithium source, and then calcine at a high temperature. The morphology is difficult to control, and irregular particle composition is often obtained. At the same time, the bulk density is low and the fluidity is poor, which is not conducive to the production of positive electrode materials; co-precipitation-high temperature solid-phase method, the nickel-cobalt-manganese hydroxide precursor is first prepared by the co-precipitation method Then a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner 贵州永合益环保科技有限公司
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