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Lithium titanate battery negative-electrode slurry preparation method

A lithium titanate battery and negative electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as low specific capacity, and achieve the effects of increasing energy density, increasing capacity, and enhancing adhesion

Inactive Publication Date: 2019-03-19
HEBEI YINLONG NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the application of lithium titanate materials, there is a disadvantage that the specific capacity is lower than other metal-based materials, and the theoretical capacity of lithium titanate is only 175mAh / g.

Method used

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  • Lithium titanate battery negative-electrode slurry preparation method
  • Lithium titanate battery negative-electrode slurry preparation method
  • Lithium titanate battery negative-electrode slurry preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1, adding carbon nanotube powder into N-methylpyrrolidone solvent, vacuuming and stirring until uniform to obtain a premixed solution;

[0042] Wherein, the solid content of the premixed solution is 3%;

[0043] Double planetary mixer is used for stirring, the stirring revolution speed is 10-20r / min, the stirring dispersion speed is 1000-2000r / min, the vacuum stirring time is 15-30min, and the relative vacuum degree of vacuum stirring is ≤-0.09Mpa;

[0044] Step 2, adding weak acid powder to the premixed solution and mixing evenly;

[0045] Among them, the pH value of the weak acid is 5-7;

[0046] The purpose of adding the weak acid is to make the base material react with the weak acid, form pits invisible to the naked eye on the base material surface, and enhance the adhesion between the slurry and the base material. In addition, the purpose of adding weak acid is also to control the pH value of the slurry, thereby reducing the water absorption of the pole piec...

Embodiment 2

[0056] Step 1, adding carbon nanotube powder into N-methylpyrrolidone solvent, vacuuming and stirring until uniform to obtain a premixed solution;

[0057] Wherein, the solid content of the premixed solution is 3%;

[0058] Double planetary mixer is used for stirring, the stirring revolution speed is 10-20r / min, the stirring dispersion speed is 1000-2000r / min, the vacuum stirring time is 15-30min, and the relative vacuum degree of vacuum stirring is ≤-0.09Mpa;

[0059] Step 2, adding weak acid powder to the premixed solution and mixing evenly;

[0060] Among them, the pH value of the weak acid is 5-7;

[0061] The purpose of adding the weak acid is to make the base material react with the weak acid, form pits invisible to the naked eye on the base material surface, and enhance the adhesion between the slurry and the base material. In addition, the purpose of adding weak acid is also to control the pH value of the slurry, thereby reducing the water absorption of the pole piec...

Embodiment 3

[0071] Step 1, adding carbon nanotube powder into N-methylpyrrolidone solvent, vacuuming and stirring until uniform to obtain a premixed solution;

[0072] Wherein, the solid content of the premixed solution is 1.5%;

[0073] Double planetary mixer is used for stirring, the stirring revolution speed is 10-20r / min, the stirring dispersion speed is 1000-2000r / min, the vacuum stirring time is 15-30min, and the relative vacuum degree of vacuum stirring is ≤-0.09Mpa;

[0074] Step 2, adding weak acid powder to the premixed solution and mixing evenly;

[0075] Among them, the pH value of the weak acid is 5-7;

[0076] The purpose of adding the weak acid is to make the base material react with the weak acid, form pits invisible to the naked eye on the base material surface, and enhance the adhesion between the slurry and the base material. In addition, the purpose of adding weak acid is also to control the pH value of the slurry, thereby reducing the water absorption of the pole pi...

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Abstract

The invention discloses a lithium titanate battery negative-electrode slurry preparation method which is implemented by the steps: 1 adding carbon nanotube powder into N-methyl pyrrolidone solvents, and vacuumizing and stirring the powder and the solvents to be uniform to obtain premixed solution; 2 adding weak acid powder into the premixed solution and uniformly mixing the weak acid powder and the premixed solution; 3 adding conductive carbon black into the solution obtained in the step 2, and vacuumizing and stirring the solution to be uniform; 4 adding active substance lithium titanate intothe solution obtained in the step 3, and vacuumizing and stirring the solution to be uniform to obtain negative-electrode mixed solution; 5 filtering the negative-electrode mixed solution by a screenwith 100-150 meshes to obtain negative-electrode slurry. Therefore, the energy density of a battery is improved without changing the size of a coated electrode plate, rolling compaction of the electrode plate and the winding meter number of cells, so that the capacity of the finished battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion power batteries, and in particular relates to a method for preparing a negative electrode slurry of a lithium titanate battery. Background technique [0002] At present, lithium-ion secondary batteries have been widely used in portable electrical appliances such as mobile phones and notebook computers. With the development of technology, lithium-ion batteries also have very good application prospects in the fields of electric vehicles and energy storage, which will have a profound impact on people's lives in the future. [0003] In recent years, a lot of research work has been done on lithium-ion battery anode materials at home and abroad. Among them, the spinel lithium titanate (Li4Ti5O12) anode material has excellent safety characteristics, cycle performance, fast charge and discharge performance and operating temperature range. Wide and other advantages, known as the most promising lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 刘金良高峰张要枫程凯杨小花
Owner HEBEI YINLONG NEW ENERGY