High nickel ternary lithium ion battery anode slurry and preparation method thereof

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing the difficulty of homogenization, achieve the effects of reducing pulping time, reducing usage, and improving dispersion force

Inactive Publication Date: 2017-04-19
SHENZHEN TOPBAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, for high-nickel ternary materials, there is residual alkali on the surface. When a conductive agent with small particles is selected, the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] The preparation method of an embodiment of the high nickel ternary lithium ion battery positive electrode slurry of the present invention may include the following steps:

[0041] S1. Weigh the raw materials in parts by weight: 89.5-97.9 parts of high nickel ternary positive electrode powder, 1-5 parts of conductive agent, 1-5 parts of binder, 0.1%-0.5% by weight of all solid powders The mixed additives and the right amount of solvent. If the above-mentioned solid raw materials are stored abnormally, they can be baked first, cooled and then pulped.

[0042] S2. The binder and mixed additives in the raw materials are added to the solvent, stirred evenly and defoamed in vacuum to prepare a glue solution. Control the temperature of the glue liquid at 25-50℃.

[0043] Further, step S2 may include:

[0044] S2.1. Add any one of the binder and the mixed additive (dispersion type additive or acid buffer type additive) to the solvent, and then add the other after mixing uniformly. A...

Example Embodiment

[0056] Example 1

[0057] Take 97 parts of high-nickel ternary positive electrode powder, 1.3 parts of conductive agent, 1.4 parts of binder, and 0.3 parts of mixed additives. In the mixed additives, the dosage ratio of disperse type additives and acid buffer type additives is 1:2; It is polyvinylidene fluoride, the solvent is N-methylpyrrolidone, 25 parts. According to the preparation method of the present invention, the above-mentioned raw materials are made into a high-nickel ternary lithium ion battery positive electrode slurry. During the whole process, the temperature of the glue and the slurry is controlled to be 25-50 ℃, and the viscosity of the final slurry is 5600 mPa.s. The solid content of the slurry is 80%. Among them, the glue preparation time is 2.5h, and the total homogenization time is 5.0h.

Example Embodiment

[0058] Example 2

[0059] Take 96.8 parts of high-nickel ternary positive electrode powder, 1.3 parts of conductive agent, 1.4 parts of binder, and 0.5 part of mixed additives. In the mixed additives, the dosage ratio of dispersive additives and acid buffer type additives is 2:1; It is polyvinylidene fluoride, the solvent is N-methylpyrrolidone, 23.5 parts. According to the preparation method of the present invention, the above-mentioned raw materials are made into a high nickel ternary lithium ion battery positive electrode slurry. During the whole process, the temperature of the glue and the slurry is controlled to be 25-50°C, and the viscosity of the final slurry is 6300mPa.s. The solid content of the slurry is 81%. Among them, the glue preparation time is 2.5h, and the total homogenization time is 5.0h.

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Abstract

The invention discloses a high nickel ternary lithium ion battery anode slurry and a preparation method thereof. The anode slurry comprises the following raw materials in parts by weight: 89.5 to 97.9 parts of high nickel ternary anode powder, 1 to 5 parts of conductive agent, and 1 to 5 parts of adhesive, and also comprises mixed additives accounting for 0.1 to 0.5% of the weight of all solid powder and a proper amount of solvent, wherein the mixed additives comprise dispersed additives and acidic buffering type additives, and due to the solvent, the solid content of the anode slurry is in a range of 60 to 85%. Through the mixed additive, the acid/alkali property of the surface of the high nickel ternary anode powder is improved, the dispersing force of the anode powder is enhanced, the using amount of the solvent is reduced, and the slurry production time is reduced. At the same time, the problem that the slurry becomes thick due to the change of pH value of the slurry surface after being contacted with the environment during the preparation process is solved, and the obtained anode slurry is uniform and is good in flowing property.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-nickel ternary lithium-ion battery cathode slurry and a preparation method thereof. Background technique [0002] At present, the market prospect of power lithium-ion batteries for electric vehicles is broad, and ternary power batteries with high energy density are increasingly recognized by various car manufacturers and battery manufacturers, and the demand is large. In order to ensure long battery life, ternary power batteries are also constantly developing in the direction of high nickel. Here, high nickel refers to the increasing Ni content in the ternary materials used. Common high-nickel ternary materials include NCM811, NCA, etc. [0003] In order to obtain a lithium-ion battery with higher energy density, the proportion of active materials in the positive electrode sheet is gradually increased, and the amount of conductive agent and binder used is dec...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/628H01M10/0525Y02E60/10
Inventor 祝佳丽付容余志文
Owner SHENZHEN TOPBAND
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