Preparation method of core-shell structure ternary positive electrode material precursor

A technology of positive electrode material and core-shell structure, which is applied in the field of preparation of core-shell structure ternary positive electrode material precursor, can solve the problems of intensified particle collision, cracking of large precursor particles, and affecting the cycle performance of battery materials, so as to ensure the cycle performance , Enhance the effect of structural strength

Active Publication Date: 2021-05-07
宜宾光原锂电材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, high-nickel ternary cathode materials have become a hot spot in the industry due to their high energy density. Under the reaction conditions of pH, with the continuous growth of the particles and the continuous increase of the solid content of the reaction system, the collision between the particles will intensify, which will easily lead to the cracking of the large particles of the precursor and seriously affect the cycle performance of the battery material.

Method used

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  • Preparation method of core-shell structure ternary positive electrode material precursor
  • Preparation method of core-shell structure ternary positive electrode material precursor
  • Preparation method of core-shell structure ternary positive electrode material precursor

Examples

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Embodiment 1

[0024] (1) Mix nickel sulfate, cobalt sulfate, and manganese sulfate in a molar ratio of 85:5:10, add pure water to stir and dissolve, and prepare a metal salt solution with a total concentration of 1.6mol / L. At the same time, prepare 10mol / L sodium hydroxide solution, 40% mass concentration of ammonia solution and 0.6% amphoteric polyacrylamide solution;

[0025] (2) at 2m 3 Add pure water to the reaction kettle to submerge the upper stirring paddle, add ammonia water until the ammonia concentration of the system is 12g / L, heat the system to 50°C, and then add sodium hydroxide solution to adjust the pH to 11.7;

[0026] (3) The above-mentioned metal salt solution is added in the reaction kettle according to a flow rate of 100L / h, and sodium hydroxide solution and ammoniacal liquor are added simultaneously to maintain the system pH and ammonia concentration, and the coprecipitation reaction is carried out under the protection of nitrogen gas continuously fed into at a stirring...

Embodiment 2

[0032] (1) Mix nickel sulfate, cobalt sulfate, and manganese sulfate in a molar ratio of 65:15:20, add pure water to stir and dissolve, and prepare a metal salt solution with a total concentration of 2mol / L. At the same time, prepare 10mol / L of Sodium hydroxide, 40% mass concentration of ammonia solution and 0.4% amphoteric polyacrylamide solution;

[0033] (2) at 2m 3 Add pure water to the reaction kettle to submerge the upper stirring paddle, add ammonia water until the ammonia concentration of the system is 10g / L, heat the system to 55°C and keep it, then add liquid caustic soda to adjust the pH to 11.6;

[0034] (3) Add the above-mentioned metal salt solution into the reaction kettle at a flow rate of 100L / h, and simultaneously add liquid caustic soda and ammonia water to maintain the pH and ammonia concentration of the system, and carry out the co-precipitation reaction at a stirring speed of 600rpm and continuously feed nitrogen protection. The slurry continuously overf...

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Abstract

The invention discloses a preparation method of a core-shell structure ternary positive electrode material precursor. The preparation method comprises the following steps: (1) preparing a metal salt solution, a precipitator solution, a complexing agent solution and an amphoteric polymeric flocculant solution; (2) adding water, a complexing agent solution and a precipitator solution into a reaction kettle to prepare a reaction kettle base solution; and (3) adding a metal salt solution, a precipitant solution and a complexing agent solution into the reaction kettle base solution, carrying out a co-precipitation reaction, starting to introduce the amphoteric polymeric flocculant solution when the particle size of particles in the reaction kettle grows to be 2-3 microns smaller than the target particle size, then continuing the reaction, and stopping feeding until the average particle size of the particles grows to the target particle size. The polymer flocculant is utilized to form a net structure on the outer layer of the precursor particles, so that the structural strength is enhanced, and ball cracks caused by collision among the particles in the later period of the reaction of the precursor are avoided, thereby ensuring the cyclicity, stability and safety.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery positive electrode materials, in particular to a preparation method of a core-shell structure ternary positive electrode material precursor. Background technique [0002] Lithium-ion batteries have been widely used due to their good cycle performance, high capacity, low price, convenient use, safety and environmental protection. Today, with the increasing market demand for high-performance batteries such as high energy density and the continuous popularization of electric vehicles, the market demand for battery cathode materials has shown a rapid growth trend. Due to the characteristics of high energy density, relatively low cost, and excellent cycle performance, ternary cathode materials are currently the most promising materials with the greatest potential among mass-produced cathode materials. Therefore, it is imminent to improve the performance of ternary precursors. In order to g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01G53/44C01P2004/03C01P2004/32C01P2004/61C01P2006/40H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杜先锋张燕辉郑德兵阳锐宋方亨
Owner 宜宾光原锂电材料有限公司
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