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Prelithiation method and prelithiation device for negative electrode of lithium battery

A lithium battery and negative electrode technology, applied in the field of lithium battery negative electrode pre-lithium method and pre-lithium device, can solve the problems of positive and negative electrode dead lithium increase, lithium consumption, material lithium loss, etc., achieve better rolling effect, mechanism setting Simple, even roll pressure results

Pending Publication Date: 2018-04-13
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD +1
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  • Application Information

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Problems solved by technology

However, the formation of the SEI film will consume part of the lithium, resulting in the loss of material lithium, and the battery capacity will also be reduced.
In addition, during the cycle use of lithium batteries, the SEI film will continue to be consumed and repaired, the dead lithium inside the positive and negative electrodes will continue to increase, and the capacity of the battery will continue to decline, resulting in a decrease in the cycle life of the battery.

Method used

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  • Prelithiation method and prelithiation device for negative electrode of lithium battery
  • Prelithiation method and prelithiation device for negative electrode of lithium battery
  • Prelithiation method and prelithiation device for negative electrode of lithium battery

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Embodiment Construction

[0027] The present invention will be described in detail in conjunction with accompanying drawing now. This figure is a simplified schematic diagram only illustrating the basic structure of the present invention in a schematic manner, so it only shows the components relevant to the present invention.

[0028] A kind of lithium battery negative pole pre-lithium method of the present invention comprises the following steps:

[0029] Step 1: Flatten the copper foil 10 or the lithium foil so that the lithium foil is located on both sides of the copper foil 10, guide the copper foil 10 and the lithium foil, and then send them into the gap between the two set pressure rollers for rolling , and make the lithium foil and the pressure roller on the same side have a wrap angle, and form a pre-lithium composite copper foil 12 after rolling;

[0030] Step 2: After the pre-lithium composite copper foil 12 material is coated with the negative electrode material and rolled twice, the pre-li...

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Abstract

The invention provides a prelithiation method and prelithiation device for a negative electrode of a lithium battery. A prelithiated negative plate of the lithium battery is formed mainly through laminating copper foil and lithium foil which are not coated with a negative electrode material into a prelithiated copper foil composite material under the cold-pressing actin of a precision roller pressand carrying out coating, drying and rolling on the copper foil composite material. The prelithiation device has the characteristics of being simple in mechanism arrangement, relatively low in manufacturing cost, good in rolling effect, smooth in surface and stable in shape.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a lithium battery negative electrode pre-lithium method and a lithium pre-preparation device. Background technique [0002] Lithium-ion batteries have the advantages of high output voltage and no memory effect, and have been widely used in mobile phone batteries and electric vehicle industries. At the same time, improving the performance of lithium-ion batteries has become the most concerned issue in the lithium battery industry, especially improving the performance of lithium batteries. capacity and prolong the service life of lithium batteries. [0003] An important process in the production process of lithium batteries is formation, the purpose of which is to form a solid electrolyte film (SEI film) on the surface of the negative electrode of the lithium battery during the first charging process. However, the formation of the SEI film will consume part ...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/1395H01M10/0525
CPCH01M4/139H01M4/1395H01M10/0525Y02E60/10
Inventor 全晓亮殷久山
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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