Manufacture process for lithium ion battery negative pulp adopting lithium titanate material

A lithium-ion battery and manufacturing process technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle stability, potential safety hazards, and large volume changes, and achieve stable discharge voltage, high safety, and excellent cycle performance Effect

Inactive Publication Date: 2012-08-01
重庆永通信息工程实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the relatively mature lithium-ion power batteries at present, the vast majority of negative electrodes are prepared with carbon negative electrode materials as active materials; however, due to the large energy loss and poor high-rate charge and discharge performance of carbon negative electrode materials, etc.
Carbon anode materials are easy to form passivation film (SEI) in organic electrolytes, causing initial irreversible loss of specific capacity; an

Method used

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  • Manufacture process for lithium ion battery negative pulp adopting lithium titanate material
  • Manufacture process for lithium ion battery negative pulp adopting lithium titanate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Making stacked lithium-ion power batteries

[0026] The production method of the negative electrode sheet:

[0027] Dissolve 8 grams of polyvinylidene fluoride in 80 grams of N-methylpyrrolidone, and use a defoaming mixer to carry out vacuum stirring (rotation 15Hz, revolution 25Hz) for 2.5h; then add 3 grams of carbon black SUPER-P, vacuum stirring (rotation 15Hz, revolution 30Hz) for 1.5h; finally add 100g lithium titanate powder and 30g N-methylpyrrolidone, stir in high-speed vacuum (35Hz rotation, 40Hz revolution) for 4h, and finally stir slowly (15Hz rotation, 25Hz revolution) for 1.5h , the negative electrode slurry was obtained after standing for 1 h in vacuum to remove air bubbles.

[0028] Coat the negative electrode slurry on both sides of a 15um thick aluminum foil, remove the solvent N-methylpyrrolidone at 120-130°C, control the thickness of the negative electrode sheet at 170±10um, and control the thickness of the negative electrode sheet after rolling At...

Embodiment 2

[0038] Winding lithium-ion power battery

[0039] The production method of the negative electrode sheet:

[0040] Dissolve 10 grams of polyvinylidene fluoride in 90 grams of N-methylpyrrolidone, stir in vacuum (rotation 15Hz, revolution 25Hz) for 3.5h; then add 4.5 grams of carbon black SUPER-P, and vacuum stir (rotation 15Hz, revolution 30Hz) 1.2h; finally add 30g of lithium titanate powder, stir in vacuum for 0.5h, then add 70g of lithium titanate powder and 30g of N-methylpyrrolidone as a solvent, stir in vacuum (rotation 35Hz, revolution 40Hz) for 5h, add titanic acid The process of lithium powder was stirred for a total of 5.5 hours. Finally, stir at a slow speed (rotation 15Hz, revolution 25Hz) for 1.2h, and leave to stand for 0.5h to remove air bubbles in a vacuum to make negative electrode slurry.

[0041]Coat the negative electrode slurry on both sides of a 15um thick aluminum foil, remove the solvent N-methylpyrrolidone at 120-130°C, control the thickness of the ne...

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Abstract

The invention relates to manufacture process for lithium ion battery negative pulp adopting a lithium titanate material, which enables the lithium ion battery negative pulp to be high in safety, good in multiplying performance and long in service life. The steps comprise dosing materials by weight: lithium titanate: 100, carbon black SUPER-P: 2-4.5, polyvinylidene fluoride: 7-11 and N-methyl pyrrolidone: 100-120; under the conditions of drying and avoiding oxidization, sequentially adding polyvinylidene fluoride, carbon black SUPER-P, lithium titanate and remaining N-methyl pyrrolidone into N-methyl pyrrolidone solution, evenly mixing the solution, slowly mixing 1-1.5 hours in vacuum mode after obtaining the pulp viscosity ranging from 6000 to 8000cps; and standing the pulp to remove bubbles in the pulp after slow stirring is finished, and then obtaining the lithium titanate negative pulp through a 100-150 mesh screen. By utilizing the manufacture process with an ideal scattering effect, the purposes of simplifying pulp manufacture process and improving the pulp scattering effect are achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a manufacturing process of lithium ion battery negative electrode slurry made of lithium titanate. Background technique [0002] The earth's energy is limited, but human consumption is unlimited. Energy shortage will threaten the survival and development of human beings. Therefore, the development of new energy sources to replace traditional oil is imminent. In order to solve the energy shortage problem, countries all over the world have invested a lot of manpower and material resources in the research and development of new energy sources. Research on new energy technology involves many technical fields such as solar energy, wind energy, and nuclear energy. Lithium-ion power batteries are one of the most important projects and one of the research hotspots. Lithium-ion power batteries and materials can be widely used in transportation, power and other ...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 赵群会冯勇杨金林任海中谢小军
Owner 重庆永通信息工程实业有限公司
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