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Washing method for removing residual alkali on surface of positive electrode material

A washing method and positive electrode material technology, applied in the direction of liquid cleaning method, positive electrode, cleaning method and utensils, etc., can solve the problems of water residue, achieve the effect of reducing surface phase change and avoiding water residue

Active Publication Date: 2021-10-22
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, it is necessary to provide a washing method for removing residual alkali on the surface of the positive electrode material, in order to solve the problem of water residue in the washing process of the ternary material in the prior art technical problem

Method used

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  • Washing method for removing residual alkali on surface of positive electrode material
  • Washing method for removing residual alkali on surface of positive electrode material
  • Washing method for removing residual alkali on surface of positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Mix 1000g of carbon disulfide with 1000g of water and disperse evenly under the action of an external ultrasonic wave to obtain a mixed solution; wherein, the ultrasonic power is 50Hz, the speed of the disperser is 1000r / min, the dispersion time is 10min, and the temperature of the dispersion is 25°C;

[0027] (2) 2000g unwashed ternary material LiNi 0.8 co 0.1 mn 0.1 o 2 Add it to the above mixed solution, wash it under the stirring condition of a high-speed disperser, after the washing is completed, let it stand at 25°C for stratification, then remove the water phase with the residual alkali dissolved in the upper layer, filter and separate the ternary material and carbon disulfide, and finally The filtered ternary material is vacuum-dried to obtain the ternary material after removing the residual alkali on the surface. Among them, the speed of the high-speed disperser is 1000r / min, the time is 10min, the temperature of the washing liquid is 25°C; the temperatu...

Embodiment 2

[0029] (1) Mix 500g of carbon disulfide with 1000g of water and disperse evenly under the action of an external ultrasonic wave to obtain a mixed solution; wherein, the ultrasonic power is 50Hz, the speed of the disperser is 1000r / min, the dispersion time is 20min, and the temperature of the dispersion is 25°C;

[0030] (2) 4500g unwashed ternary material LiNi 0.8 co 0.1 mn 0.1 o 2Add it to the above mixed solution, wash it under the stirring condition of a high-speed disperser, after the washing is completed, let it stand at 25°C for stratification, then remove the water phase with the residual alkali dissolved in the upper layer, filter and separate the ternary material and carbon disulfide, and finally The filtered ternary material is vacuum-dried to obtain the ternary material after removing the residual alkali on the surface. Among them, the speed of the disperser is 1000r / min, the time is 10min, the temperature of the washing liquid is 60°C; the temperature of the vac...

Embodiment 3

[0032] (1) Mix 100g of 1,4-dichlorobenzene with 1000g of water and disperse evenly under the action of an external ultrasonic wave to obtain a mixed solution; wherein, the ultrasonic power is 50Hz, the speed of the disperser is 1000r / min, the dispersion time is 10min, and the temperature of the dispersion is 60°C ;

[0033] (2) 2200g unwashed ternary material LiNi 0.8 co 0.1 mn 0.1 o 2 Add it to the above mixed liquid, wash it under the condition of stirring in a high-speed disperser, after washing, let it stand at 60°C for stratification, then remove the water phase in which the residual alkali is dissolved in the upper layer, and mix the ternary material and 1,4-bis The chlorobenzene is separated by filtration, and finally the filtered ternary material is vacuum-dried to obtain the ternary material after removing the residual alkali on the surface. Among them, the speed of the high-speed disperser is 1000r / min, the time is 10min, the temperature of the washing liquid is ...

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Abstract

The invention discloses a washing method for removing residual alkali on the surface of a positive electrode material. The washing method comprises the following steps that an aprotic non-polar solvent and water are mixed and then uniformly dispersed to obtain a mixed solution; the density of the aprotic non-polar solvent is 1.0 g / cm<3>-4.8 g / cm<3>; and a ternary material LiNixCoyMnzO2 to be washed is added into the mixed solution for washing, and then standing is conducted for layering, dewatering, filtering and drying are conducted, and the ternary material with the surface residual alkali removed is obtained. According to the method, the aprotic non-polar solvent is used as a carrier in the water washing process, so that water residue after water washing is avoided, the purpose of completely removing residual alkali on the surface of the ternary material is achieved, an electron-free exchange reaction between H<+> in a traditional protic solvent and Li<+> on the surface of the positive electrode material in the drying process can be avoided, and surface phase change is reduced.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials, in particular to a washing method for removing residual alkali on the surface of positive electrode materials. Background technique [0002] The residual alkali on the surface of the ternary material is mainly LiOH and Li 2 CO 3 , Too high residual alkali on the surface will cause the slurry to become jelly during the coating and stirring process. Layered cathode materials with a nickel content of more than 80% will become the next generation of commercial ternary cathode materials, but too high a Ni content will cause a series of problems. For example, during the process of sintering to prepare positive electrode materials, Li + / Ni 2+ The phenomenon of mixed cation occupation, more importantly, the residual lithium (LiOH and LiOH) on the surface of the positive electrode material after sintering 2 CO 3 Excessive form) will cause the positive electrode material to abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B3/08B08B3/12F26B5/04H01M4/505H01M4/525H01M10/0525
CPCB08B3/08B08B3/12F26B5/04H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 许开华赵德徐世国陈玉君张明龙侯奥林刘钊
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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