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Production method of current collector, current collector and secondary battery

A current collector and battery technology, which is applied in the manufacture of secondary batteries, battery electrodes, electrode carriers/current collectors, etc., can solve the problem of difficult control of the density of the electrodeposited layer or electroplating layer, easy fall-off of the electrolyte soaked, and difficulty in stable and continuous production and other issues to achieve the effect of low cost, small investment and easy production

Pending Publication Date: 2021-01-15
JIANGSU ADVANCED MATERIAL TECH CO LTD
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Problems solved by technology

[0004] The disadvantages of the above technical solutions are: 1) large investment and low production efficiency, especially difficult to achieve stable continuous production; 2) the density of the electrodeposited layer or electroplating layer is difficult to control, and the electrolyte is easy to fall off after soaking

Method used

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  • Production method of current collector, current collector and secondary battery
  • Production method of current collector, current collector and secondary battery
  • Production method of current collector, current collector and secondary battery

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preparation example Construction

[0034] figure 1 A preparation method of a current collector in the present application is shown. Such as figure 1 Shown, described current collector preparation method comprises the following steps:

[0035] S10, one-time compounding; coating the adhesive on the first surface of the substrate, and compounding the rolled first foil on the first surface;

[0036] S20, secondary compounding: coating the adhesive on the second surface of the substrate, and compounding the calendered second foil on the second surface;

[0037] S30. Soaking and etching: immersing the composite film obtained through the primary composite and secondary composite steps in an alkaline solution;

[0038] S40, spraying and drying: spraying and rinsing the soaked and etched composite film, drying and winding.

[0039] In the above technical solution, the present application uses an adhesive to compound the calendered first and second foils on both sides of the substrate, and then thins the first and se...

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Abstract

The invention discloses a production method of a current collector, the current collector and a secondary battery, and relates to the technical field of secondary batteries. A first foil and a secondfoil which are calendered are compounded on the two sides of a base material through an adhesive, and then the first foil and the second foil are thinned to a required thickness through an alkaline solution so that tight compounding between the base material and the foils can be guaranteed, the density of the foils is improved through calendering, and the composite current collector can pass an electrolyte immersion test and has high safety performance. Meanwhile, according to the technical scheme, investment is small, a technological process is similar to that of a cleaning machine, equipmentis low in cost compared with a vacuum coating machine, production can be rapidly expanded depending on domestic equipment manufacturers, and compared with the prior art, stable and continuous production can be achieved more easily.

Description

technical field [0001] The present application relates to the technical field of secondary batteries, in particular to a method for preparing a current collector, a current collector, and a secondary battery. Background technique [0002] The current collector is the main component of the lithium-ion secondary battery, which is used to carry positive and negative active materials, collect and conduct electrons. The common configuration method is that copper foil material is used for the negative electrode and aluminum foil material is used for the positive electrode. Due to the use of metal materials, the positive and negative current collectors account for a relatively large proportion (about 8%) of the total weight of the battery cell, so reducing the weight of the current collector is an effective way to increase the energy density (kWh / kg) of lithium-ion batteries. At present, the minimum thickness of aluminum foil products is 9 μm, and the minimum thickness of copper f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/04
CPCH01M4/667H01M10/04Y02E60/10Y02P70/50
Inventor 魏凤杰王晓明张磊韩冰
Owner JIANGSU ADVANCED MATERIAL TECH CO LTD
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