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Preparation method of high-safety and high-performance lithium battery negative electrode

A negative electrode, high-performance technology, applied in the direction of battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of not being able to effectively alleviate volume expansion, occupy a large area, and reduce safety, and achieve good apparent quality and safety High performance, the effect of mentioning safety

Inactive Publication Date: 2019-05-28
湖北锂诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has three times of coating, the equipment occupies a large area, and has high requirements for the device, and the maintenance cost is high. At the same time, the thickness of the current collector is thin, and the thickness of the coating is much larger than the thickness of the current collector. Effectively relieve volume expansion and reduce safety

Method used

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  • Preparation method of high-safety and high-performance lithium battery negative electrode
  • Preparation method of high-safety and high-performance lithium battery negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The present invention comprises the following steps:

[0030] (1) Lead the copper foil (thickness 6-20um, coated with 1-4um thick conductive agent) through the unwinding unit 1, control the tension and speed of the roller, so that the copper foil runs stably without large jitter;

[0031] (2) Pass the copper foil through the corona surface treatment unit 2, utilize the generated plasma area to enhance the surface activity of the material, increase the surface roughness of the copper foil, improve the surface tension of the copper foil, and improve the coating effect;

[0032] (3) The silicon-carbon negative electrode slurry (silicon mass fraction is 6%) is coated on the copper foil through the double-sided extrusion coating mechanism 3 to obtain a uniform coating. During the single-side baking process of the pole piece, when the remaining solvent content is 10% and the surface is in a gel state, the laser mechanism 4 (laser power 100W) is used to punch micropores on the...

Embodiment 2

[0036] The present invention comprises the following steps:

[0037] (1) Lead the copper foil (thickness 6-20um, coated with 1-4um thick conductive agent) through the unwinding unit 1, control the tension and speed of the roller, so that the copper foil runs stably without large jitter;

[0038] (2) Pass the copper foil through the corona surface treatment unit 2, utilize the generated plasma area to enhance the surface activity of the material, increase the surface roughness of the copper foil, improve the surface tension of the copper foil, and improve the coating effect;

[0039] (3) Coating the silicon-carbon negative electrode slurry (the mass fraction of silicon is 8%) on the copper foil through the double-sided extrusion coating mechanism 3 to obtain a uniform coating. During the single-side baking process of the pole piece, when the remaining solvent content is 20% and the surface is in a gel state, the laser mechanism 4 (laser power 500W) is used to punch micropores on ...

Embodiment 3

[0043] The present invention comprises the following steps:

[0044] (1) Lead the copper foil (thickness 6-20um, coated with 1-4um thick conductive agent) through the unwinding unit 1, control the tension and speed of the roller, so that the copper foil runs stably without large jitter;

[0045] (2) Pass the copper foil through the corona surface treatment unit 2, utilize the generated plasma area to enhance the surface activity of the material, increase the surface roughness of the copper foil, improve the surface tension of the copper foil, and improve the coating effect;

[0046] (3) The silicon-carbon negative electrode slurry (silicon mass fraction is 10%) is coated on the copper foil through the double-sided extrusion coating mechanism 3 to obtain a uniform coating. During the single-side baking process of the pole piece, when the remaining solvent content is 30% and the surface is in a gel state, the laser mechanism 4 (laser power 1000W) is used to punch micropores on t...

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Abstract

The invention relates to a preparation method of a high-safety and high-performance lithium battery negative electrode. The method comprises the following steps that A, copper foil is led out throughan unwinding unit (1); B, the copper foil is subjected to surface treatment through a corona surface treatment unit (2); C, coating the copper foil with silicon-carbon negative electrode slurry to obtain a coated pole piece; D, baking the pole piece in a baking oven, punching micropores in the surface of a pole piece dressing area through a laser mechanism (4), and E, conducting coating with a certain component of ceramic and binder mixed slurry through an intaglio coating mechanism (7) after a porous silicon carbon negative pole piece is formed, and drying the pole piece to obtain the high-safety and high-performance lithium battery negative electrode. The capacity and cycle life of the battery are improved, and the safety is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a high-safety, high-performance lithium battery negative electrode. Background technique [0002] Lithium batteries are widely used in energy storage devices, mobile power supplies and automobiles. At present, graphite is the most widely used negative electrode material for commercial lithium-ion batteries, but because of its lithium intercalation potential close to that of metal lithium, it is highly sensitive to the electrolyte and has certain safety hazards, and the theoretical specific capacity of graphite is low (372mAh / g), thus unable to meet the demand for the development of high-capacity, high-safety lithium-ion batteries. [0003] Silicon reserves are abundant, and the theoretical specific capacity of silicon is as high as 4200mAh / g (based on the formation of Li 22 Si 4 alloy), so silicon-based materials are considere...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/04H01M4/133H01M10/0525H01M10/42
CPCY02E60/10
Inventor 马卫华诚张天赐孙伟兵梁根兴
Owner 湖北锂诺新能源科技有限公司
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