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Low-cobalt positive electrode material and preparation method and application thereof

A positive electrode material and reaction technology, applied in the field of low-cobalt positive electrode materials and their preparation, can solve the problems of low-cobalt material stability needs to be improved, low-cobalt material preparation methods are complicated, etc.

Pending Publication Date: 2021-08-24
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the preparation method of the low-cobalt material provided by the above-mentioned patent is relatively complicated, and the stability of the prepared low-cobalt material also needs to be improved

Method used

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  • Low-cobalt positive electrode material and preparation method and application thereof

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Embodiment 1

[0046] A preparation method of a low-cobalt cathode material, the preparation method comprising the steps of:

[0047] (1) Nickel sulfate, cobalt sulfate, manganese sulfate, ammonia water and sodium hydroxide are continuously added to the reactor for reaction to obtain ternary precursor particles;

[0048] The add-on of sodium hydroxide is 15L / h in the process of adding reactor; The add-on of ammoniacal liquor is 10L / h; According to the increase rate of 0.0002mol / L.min increased to 0.15mol / L, the molar concentration of manganese decreased from 0.4mol / L to 0.3mol / L according to the decrease rate of 0.0002mol / L.min, the ammonia water The molar concentration is 3mol / L, and the molar concentration of sodium hydroxide is 10mol / L;

[0049] (2) Mix the ternary precursor particles obtained in step (1) with the lithium precursor at a molar ratio of 1:1.06, and sinter at 950° C. for 8 hours to obtain the low-cobalt positive electrode material.

Embodiment 2

[0051] A preparation method of a low-cobalt cathode material, the preparation method comprising the steps of:

[0052] (1) Add nickel sulfate, cobalt sulfate, manganese sulfate / ammonia water and sodium hydroxide to the reaction kettle for reaction to obtain ternary precursor particles;

[0053] The add-on of sodium hydroxide is 10L / h in the process of adding reactor; The add-on of ammoniacal liquor is 5L / h; According to the increase rate of 0.0002mol / L.min increased to 0.14mol / L, the molar concentration of manganese decreased from 0.36mol / L to 0.26mol / L according to the decrease rate of 0.0002mol / L.min, the mole of ammonia Concentration is 2mol / L, and the molar concentration of sodium hydroxide is 10mol / L;

[0054] (2) Mix the ternary precursor particles obtained in step (1) with the lithium precursor at a molar ratio of 1:1.06, and sinter at 1000° C. for 7 hours to obtain the low-cobalt positive electrode material.

Embodiment 3

[0056] A preparation method of a low-cobalt cathode material, the preparation method comprising the steps of:

[0057] (1) Add nickel sulfate, cobalt sulfate, manganese sulfate / ammonia water and sodium hydroxide to the reaction kettle for reaction to obtain ternary precursor particles;

[0058] The add-on of sodium hydroxide is 20L / h in the process of adding reactor; The add-on of ammoniacal liquor is 15L / h; According to the increase rate of 0.0002mol / L.min increased to 0.14mol / L, the molar concentration of manganese decreased from 0.45mol / L to 0.36mol / L according to the decrease rate of 0.0002mol / L.min, the mole of ammonia Concentration is 3mol / L, and the molar concentration of sodium hydroxide is 10mol / L;

[0059] (2) Mix the ternary precursor particles obtained in step (1) with the lithium precursor at a molar ratio of 1:1.06, and sinter at 900° C. for 9 hours to obtain the low-cobalt positive electrode material.

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Abstract

The invention provides a low-cobalt positive electrode material and a preparation method and application thereof. The preparation method comprises the steps that a nickel precursor, a cobalt precursor, a manganese precursor, a precipitator and a complexing agent are continuously added into a reaction kettle for a reaction, the molar concentration of the nickel precursor in the reaction kettle is kept unchanged, the molar concentration of the cobalt precursor is continuously increased, and the molar concentration of the manganese precursor is continuously reduced, so that ternary precursor particles are obtained; the ternary precursor particles and a lithium precursor are mixed and sintered to obtain the low-cobalt positive electrode material of which the cobalt content is gradually increased from inside to outside; and the low-cobalt positive electrode material has the advantages of low content and stable structure, and is beneficial to improving the electrical properties of a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a low-cobalt positive electrode material and a preparation method and application thereof. Background technique [0002] Low-cobalt materials are currently the main solution for cost reduction of lithium-ion batteries, but the reduction of cobalt elements will also lead to deterioration of electrochemical performance and processing performance, such as: reduced compaction, reduced capacity, deteriorated low-temperature performance, and a significant increase in high-temperature cycle resistance; Therefore, it is a big problem to ensure performance while reducing costs. In order to meet the electrochemical performance and processing performance of the project, the cobalt content of mass-produced NCM in the industry is generally not less than 0.12mol% (based on transition metals). Its performance is significantly affected by the content of three elements: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/50H01M4/505H01M4/525H01M10/0525H01M2004/028C01P2006/40Y02E60/10
Inventor 孙化雨其他发明人请求不公开姓名
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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