Power type lithium ion battery positive electrode material precursor and preparation method thereof

A technology of lithium ion battery and cathode material, which is applied to the field of cathode material precursor of power type lithium ion battery and its preparation field, can solve the problems of increasing lithium ion transmission path, decreasing rate performance, decreasing efficiency, etc., so as to improve cycle and rate performance, improve processability, prevent cracking

Pending Publication Date: 2022-07-22
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

On the contrary, with the increase of the particle size of the positive electrode material of the power lithium-ion battery, the processing performance of the product is enhanced, and the lithium ion transmission path is enlarged, resulting in a decrease in efficiency and a decrease in rate performance.

Method used

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  • Power type lithium ion battery positive electrode material precursor and preparation method thereof
  • Power type lithium ion battery positive electrode material precursor and preparation method thereof
  • Power type lithium ion battery positive electrode material precursor and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0037] A method for preparing a precursor of a positive electrode material for a power-type lithium ion battery, comprising:

[0038] Step 1: Prepare a mixed solution of Ni, Co, Mn, and Zr salts, wherein the total molar concentration of Ni, Co, Mn, and Zr in the mixed solution is 2.0 mol / L, and the molar ratio is 45:25:29.8:0.2;

[0039] The preparation molar concentration is 10mol / L sodium hydroxide or potassium hydroxide solution as precipitant;

[0040] Aqueous ammonia solution with a molar concentration of 2.5 mol / L was prepared as a complexing agent;

[0041] Step 2, adding pure water, the precipitating agent and the complexing agent to the closed reaction kettle to form a bottom liquid, the pH value of the bottom liquid is controlled by the precipitating agent to be 12.20~12.60, and the pH value of the bottom liquid is controlled by the complexing agent. The ammonia concentration is 0.2mol / L, and the bottom liquid temperature is maintained at 60℃;

[0042] Step 3, keep...

Embodiment 2

[0054] A method for preparing a precursor of a positive electrode material for a power-type lithium ion battery, comprising:

[0055] Step 1. Prepare a mixed solution of Ni, Co, Mn, and Zr salts, wherein the total molar concentration of Ni, Co, Mn, and Zr in the mixed solution is 2.0 mol / L, and the molar ratio is 65:15:19.8:0.2;

[0056] The preparation molar concentration is 10mol / L sodium hydroxide or potassium hydroxide solution as precipitating agent;

[0057] Aqueous ammonia solution with a molar concentration of 2.5 mol / L was prepared as a complexing agent;

[0058] Step 2, adding pure water, the precipitating agent and the complexing agent to the closed reaction kettle to form a bottom liquid, the pH value of the bottom liquid is controlled by the precipitating agent to be 12.20~12.60, and the pH value of the bottom liquid is controlled by the complexing agent. The ammonia concentration is 0.25mol / L, and the temperature is maintained at 65℃;

[0059] Step 3, keep the ...

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Abstract

A power type lithium ion battery positive electrode material precursor has a chemical formula of NixCoyMnzMk (OH) 2, and a preparation method comprises the following steps: 1, preparing a mixed solution of Ni, Co, Mn and M salts; preparing a sodium hydroxide or potassium hydroxide solution as a precipitator; preparing an ammonia water solution as a complexing agent; 2, adding pure water, a precipitator and a complexing agent into the kettle to prepare a base solution; 3, introducing mixed gas of air and nitrogen, and continuously adding the mixed solution, a precipitant and a complexing agent into the kettle for coprecipitation; controlling the solid content in the kettle, and stopping the reaction when the material granularity reaches a target; and 4, carrying out filter pressing, washing and drying on the product to obtain the loose and porous power type lithium ion battery positive electrode material precursor. According to the precursor disclosed by the invention, the cycle performance and the rate performance are improved, the processing performance of the material is improved, and the battery grade piece is prevented from being broken in the rolling process. The lithium ion transmission efficiency is high, and the rate capability is ensured.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a precursor of positive electrode materials for power type lithium ion batteries and a preparation method thereof. Background technique [0002] After years of development, the cathode material technology of conventional lithium-ion batteries has become relatively mature, and the competitive advantage of its peers is no longer there. In order to adapt to the high power output of electric vehicles, power-type lithium-ion battery cathode materials came into being. Compared with conventional lithium-ion battery cathode materials, power-type lithium-ion battery cathode materials can work in a high current environment, meeting the needs of vehicle power batteries. [0003] At present, the particle size of power-type lithium-ion battery cathode materials used in the market is generally 3-4 um, and a smaller particle size is beneficial to ...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525C01P2006/40C01P2004/61C01P2006/11C01P2006/12
Inventor 朱用褚凤辉袁超群李加闯王梁梁
Owner 南通金通储能动力新材料有限公司
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