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Preparation method of current collector for lithium battery and composite current collector

A technology for current collectors and lithium batteries, applied in the field of composite current collectors, can solve problems such as unsatisfactory coating effect and inability to improve thermal control, and achieve the effects of increasing thickness, improving heat resistance, and preventing burning or deformation.

Pending Publication Date: 2021-11-23
JIANGSU ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to solve the problem in the prior art that the thermal control cannot be improved in the preparation method of reducing the thickness of the current collector, resulting in an unsatisfactory coating effect, the present invention provides a lithium battery. The preparation method of the current collector is to obtain a layered structure by coating a release agent on the film and plating a metal layer on the surface of the release agent; and then compounding two layered metal layers together to obtain a composite layered structure , and then the carrier in the composite layered structure is peeled off to obtain the current collector

Method used

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  • Preparation method of current collector for lithium battery and composite current collector
  • Preparation method of current collector for lithium battery and composite current collector
  • Preparation method of current collector for lithium battery and composite current collector

Examples

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Effect test

preparation example Construction

[0035] like figure 1 Shown, a kind of preparation method of current collector for lithium battery comprises the following steps:

[0036] S1: Coating and curing a release agent on the surface of the film 11 to obtain a carrier 10 with a release layer 12 on the surface.

[0037] It should be noted that the film 11 may be made of paper, plastic or metal. Depending on the manufacturing process, a suitable film 11 material can be selected. Coating a release agent on the surface of the film 11 makes it easier for the carrier 10 to be peeled off from the metal layer 13 . When performing evaporation or sputtering, it is better to select the thin film 11 with heat resistance. For example, the thin film 11 made of metal can achieve heat resistance above 500°C.

[0038] S2: The metal layer 13 is plated on the carrier 10 by evaporation or sputtering, and the metal layer 13 is deposited on the surface of the release layer 12 to obtain a layered structure 100. The layered structure 100...

Embodiment 1

[0051] A release agent was coated on the surface of a PET film with a thickness of 50 microns and cured to obtain a carrier, and the thickness of the release layer on the carrier was 10 nm.

[0052] A winding-type evaporative vacuum coating machine is used to evaporate copper on the surface of the release layer on the PET film, and the copper layer is deposited on the surface of the release layer to obtain a layered structure. The layered structure includes a PET film, a release layer and a copper layer, wherein the thickness of the copper layer is 0.7 microns.

[0053] By repeating the above steps, multiple layered structures can be obtained, and two layered structures are arbitrarily selected from among the multiple layered structures for compounding. The two layered structures are respectively recorded as the first layered structure and the second layered structure. Colloid is coated on the surface of the copper layer of the first layered structure by using winding composit...

Embodiment 2

[0056] A release agent was coated on the surface of a PET film with a thickness of 50 microns and cured to obtain a carrier, and the thickness of the release layer on the carrier was 10 nm.

[0057] A winding-type evaporative vacuum coating machine is used to evaporate copper on the surface of the release layer on the PET film, and the copper layer is deposited on the surface of the release layer to obtain a layered structure. The layered structure includes PET film, release layer and copper layer. Wherein, the thickness of the copper layer is 0.7 microns.

[0058] The above steps are repeated to obtain multiple layered structures, and two layered structures are arbitrarily selected from the multiple layered structures for compounding, and the two layered structures are respectively recorded as the first layered structure and the second layered structure. Use winding compound equipment, use 3 micron thick PET film as the substrate, coat the colloid on the surface of the coppe...

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Abstract

The invention discloses a preparation method of a current collector for a lithium battery, which comprises the following steps of: S1, manufacturing a carrier; S2, plating a metal layer on the carrier, and depositing the metal layer on the surface of a release layer to obtain a layered structure; S3, coating the surface of the metal layer of a first layered structure with colloid, and then bonding the metal layer of a second layered structure to the colloid, so as to bond the metal layer of the first layered structure and the metal layer of the second layered structure; and after the colloid is preliminarily cured, obtaining a first composite layered structure; and S4, curing the first composite layered structure to form a stable compound on a colloid layer; and stripping the carrier in the first layered structure and the carrier in the second layered structure to obtain a first current collector which comprises the metal layer of the first layered structure, the colloid layer and the metal layer of the second layered structure. According to the invention, thermal control in the current collector preparation process can be improved, and the thickness of a current collector support body can be reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a current collector for lithium batteries and a composite current collector. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, lithium ions intercalate and deintercalate back and forth between the two electrodes: during charging, lithium ions are deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] Lithium-ion batteries usually use copper foil as the positive current collector, and copper foil as the negative current collector. With the continuous development of lithium battery technology, whether it is lithium batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/667H01M4/661H01M10/0525Y02E60/10
Inventor 周予坤王晓明解金库张磊
Owner JIANGSU ADVANCED MATERIAL TECH CO LTD
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