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Negative electrode sheet of lithium ion battery, manufacturing method thereof, and manufacturing device thereof

A lithium-ion battery and manufacturing device technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, batteries, etc., can solve the problems of difficult to control the thickness of the metal lithium layer, hidden safety hazards for operators, and complicated handling of pole pieces. Efficiency, low environmental requirements, and simple device architecture

Active Publication Date: 2016-01-20
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can play the role of lithium supplementation and increase the capacity of the battery, however, because the lithium powder is relatively light, it is easy to float in the air, which will cause a greater safety hazard to the operator.
[0006] In addition, the Japanese patent application with application number JP2008038720 mentions that a metal lithium layer is evaporated on the surface of the negative electrode sheet by vacuum evaporation. Although the thickness of the evaporated metal lithium layer is thinner than that of the metal lithium sheet, in the process The thickness of the evaporated metal lithium layer is difficult to control, and the whole process must be carried out in a vacuum environment, the evaporation efficiency is also low, the subsequent electrode sheet processing is also more complicated, and the production cost is higher

Method used

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  • Negative electrode sheet of lithium ion battery, manufacturing method thereof, and manufacturing device thereof
  • Negative electrode sheet of lithium ion battery, manufacturing method thereof, and manufacturing device thereof
  • Negative electrode sheet of lithium ion battery, manufacturing method thereof, and manufacturing device thereof

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Embodiment 1

[0028] Such as figure 1 As shown, a negative electrode sheet of a lithium ion battery includes a negative electrode collector sheet 11, both surfaces of the negative electrode collector sheet are coated with active material layers 12, and an SEI film 13 is provided on the surface of one active material layer.

[0029] A method for manufacturing a negative electrode sheet of a lithium ion battery, comprising the following steps:

[0030] 1) Coating the surface of an active material layer containing lithium ions Li + The electrolyte solution, the primary electrode sheet includes a negative electrode collector sheet and an active material layer coated on both surfaces of the negative electrode collector sheet;

[0031] 2) Connect the positive terminal of the DC power supply to the electrolyte on the above-mentioned one active material layer, and connect the negative terminal of the DC power supply to the primary plate without contacting the electrolyte. Under the action of DC vo...

Embodiment 2

[0042] Such as image 3 As shown, a negative electrode sheet of a lithium ion battery includes a negative electrode collector sheet 51, both surfaces of the negative electrode collector sheet are coated with active material layers 52, and SEI films 53 are provided on the surfaces of both active material layers.

[0043] A method for manufacturing a negative electrode sheet of a lithium ion battery, comprising the following steps:

[0044] 1) Coating the surface of the two active material layers containing lithium ions Li + The electrolyte solution, the primary electrode sheet includes a negative electrode collector sheet and an active material layer coated on both surfaces of the negative electrode collector sheet;

[0045] 2) Connect the positive terminal of the DC power supply to the electrolyte on the two active material layers, and connect the negative terminal of the DC power supply to the primary electrode sheet without contacting the electrolyte. Under the action of DC...

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Abstract

The invention specifically relates to a negative plate of a lithium ion battery and a manufacturing method and manufacturing device thereof. The negative plate of the lithium ion battery comprises a negative collector plate. At least a surface of the negative collector plate is uniformly coated with an active material layer which is characterized in that the surface of at least an active material layer is provided with a SEI film. By arranging the SEI film on the surface of the negative plate in advance, high irreversible capacity of the active material is eliminated effectively. Thus, capacity of the manufactured negative plate matches capacity of a positive pole; the problem that performance of the positive pole cannot be performed fully is solved; and initial efficiency of the battery is raised. Furthermore, capacity of the battery is raised, and cycle performance of the battery can be improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of manufacturing methods of lithium-ion batteries, and in particular relates to a negative electrode sheet of a lithium-ion battery, a manufacturing method thereof, and a manufacturing device thereof. 【Background technique】 [0002] Lithium-ion battery is a portable and environmentally friendly battery with high voltage, high energy density, long cycle life, and good safety performance. It has been widely used in portable electronic devices such as mobile phones, video recorders, and tablet computers. got some application. However, with the miniaturization of portable electronic devices, and the development and application of high-power devices such as electric vehicles (EV) and hybrid electric vehicles (HEV) have been highly valued, people require high-capacity lithium-ion batteries as power systems. and high power characteristics. [0003] In order to meet the requirements of high capacity and high pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139H01M10/0525H01M2220/20Y02E60/10
Inventor 高云智徐延铭陈秀梅李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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