Method for supplementing lithium powder to lithium-ion battery negative plate

A technology for lithium-ion batteries and negative plates, which is applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of inaccurate quantitative lithium intercalation, harsh environmental requirements, and high production costs, and achieve low cost, improved cycle, and narrowed restrictions Effect

Active Publication Date: 2012-11-14
NINGDE AMPEREX TECH
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Problems solved by technology

In order to overcome the disadvantages of uneven lithium intercalation, inability to accurately quantitatively intercala

Method used

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  • Method for supplementing lithium powder to lithium-ion battery negative plate

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Embodiment Construction

[0025] Such as figure 1 As shown, the device used in the method for replenishing lithium powder to the lithium ion battery negative electrode sheet of the present invention includes a rewinding and unwinding mechanism for placing and pulling the negative electrode sheet 4, a feeding mechanism 9 for placing lithium powder, and a device for providing an electric field. The high-voltage DC power supply 1 and the feeding mechanism 9 are located above the negative electrode sheet. Wherein, the winding and unwinding mechanism includes an unwinding roller 31, a winding roller 32, and two guide rollers 33 between the unwinding roller 31 and the winding roller 32, wherein, the positive side of a guiding roller 33 close to the winding roller 32 A pressing roller 34 is arranged above.

[0026] The method for supplementing the lithium-ion battery negative electrode sheet with the above-mentioned device includes the following steps: in the first step, the cold-pressed negative electrode s...

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Abstract

The invention belongs to the technical field of lithium-ion battery, and in particular relates to a method for supplementing lithium powder to a lithium-ion battery negative plate. The method comprises the following steps: a first step, putting the cold-pressed negative plate on an unwinding and rewinding mechanism, and putting lithium powder to a feeding mechanism above the negative plate; a second step, adding electric fields and opening the feeding mechanism, so that the lithium powder is adsorbed on the surface of the negative plate under the action of the electric fields; and a third step, rolling the negative plate adsorbed with the lithium powder. Compared with the prior art, the method can control the movement of the lithium powder to overcome the flotation of metal lithium powder in air through electrostatic effect provided by the electric fields, and can simultaneously control the addition of the lithium powder and the dispersion degree of the lithium powder on the negative plate, thereby uniformly, quantitatively and precisely dispersing the lithium powder on the surface of the negative plate. Besides, the whole process provided in the invention is only needed to be carried out in a drying environment without adding the lithium powder in a process of preparing slurry, has a simple manufacture process and low cost, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for replenishing lithium powder to a lithium ion battery negative plate. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages of high voltage, high energy density and long cycle life. However, with the miniaturization of portable electronic devices and the continuous development of long standby time, as well as the use of high-power and high-energy devices such as electric bicycles and electric vehicles, the energy density of lithium-ion batteries as energy storage power sources has been increasingly raised. high demands. [0003] For the negative electrode sheet, part of the lithium will be consumed due to the formation of the solid electrolyte film (SEI film) during the first charging process of the battery, which will cause the loss of lithium in the positive ...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/1395H01M4/04
CPCY02E60/122Y02E60/10
Inventor 钟开富吴祖钰李进华陈振张五堂
Owner NINGDE AMPEREX TECH
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