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Composite current collector and preparation method thereof

A technology for current collectors and substrates, applied in electrode current collector coating, electrode manufacturing, electrode carrier/current collectors, etc. Peeling force, enhancing the peeling force of the pole piece, reducing the effect of internal resistance

Active Publication Date: 2022-06-03
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase in the number of cycles will lead to greater cycle expansion of the negative electrode. During the reciprocating expansion and contraction process, the negative electrode active material is easy to fall off from the current collector. It is difficult to suppress the occurrence of this situation with the current conventional copper foil current collector.
At the end of the cycle, the negative electrode active material falls off from the current collector, which will accelerate the capacity decay of the battery cell, reduce the DCIR, and even cause lithium precipitation, which will affect the safety of the battery.

Method used

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  • Composite current collector and preparation method thereof
  • Composite current collector and preparation method thereof
  • Composite current collector and preparation method thereof

Examples

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Embodiment 1

[0051] This embodiment provides a composite current collector and a preparation method thereof. The composite current collector includes an etched copper foil containing hydroxyl groups on the surface and a modified adhesive layer disposed on one surface of the etched copper foil. The thickness of the binder layer is 1.5 μm, and the modified binder layer includes a modified binder LA136S1 containing hydroxyl and carboxyl groups on the surface.

[0052] The present embodiment also provides a preparation method of the above-mentioned composite current collector, including:

[0053] (1) Preparation of etched copper foil: Take copper foil with a thickness of 8 μm, ultrasonically clean it with acetone, absolute ethanol, and deionized water in turn to remove the oil film on the surface, and then dry the copper foil naturally at room temperature; configure the volume ratio A mixture of 1:1 sodium persulfate and ammonia water was used as the etching solution, and the copper foil after...

Embodiment 2

[0060] This embodiment provides a composite current collector and a preparation method thereof. The composite current collector includes an etched copper foil containing hydroxyl groups on the surface and a modified adhesive layer disposed on one surface of the etched copper foil. The thickness of the binder layer is 2 μm, and the modified binder layer includes a modified binder LA136S1 containing hydroxyl and carboxyl groups on the surface.

[0061] The present embodiment also provides a preparation method of the above-mentioned composite current collector, including:

[0062] (1) Preparation of etched copper foil: Take a copper foil with a thickness of 7 μm, ultrasonically clean it with acetone, anhydrous ethanol, and deionized water in turn to remove the oil film on the surface, and then dry the copper foil naturally at room temperature; configure the volume ratio A mixture of 1:1 sodium persulfate and ammonia water was used as the etching solution, and the copper foil afte...

Embodiment 3

[0069] This embodiment provides a composite current collector and a preparation method thereof. The composite current collector includes an etched copper foil containing hydroxyl groups on the surface and a modified adhesive layer disposed on one surface of the etched copper foil. The thickness of the binder layer is 1 μm, and the modified binder layer includes a modified binder LA136S1 containing hydroxyl and carboxyl groups on the surface.

[0070] The present embodiment also provides a preparation method of the above-mentioned composite current collector, including:

[0071] (1) Preparation of etched copper foil: Take copper foil with a thickness of 9 μm, ultrasonically clean it with acetone, anhydrous ethanol, and deionized water in turn to remove the oil film on the surface, and then dry the copper foil naturally at room temperature; configure the volume ratio A mixture of 1:1 sodium persulfate and ammonia water was used as the etching solution, and the copper foil after ...

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Abstract

The invention provides a composite current collector and a preparation method thereof.The composite current collector comprises a current collector base material with the surface containing hydroxyl and a modified binder layer arranged on the surface of at least one side of the current collector base material, the modified binder layer comprises a modified binder, the surface of the modified binder comprises modified polyacrylonitrile, and the modified polyacrylonitrile is modified polyacrylonitrile. The modified polyacrylonitrile is connected with hydroxyl and / or carboxyl, and the current collector base material is a porous current collector base material. According to the invention, the porous current collector base material containing hydroxyl on the surface is matched with the specific modified binder for use, and the hydroxyl and / or carboxyl on the surface of the binder not only can generate acting force with the hydroxyl on the surface of the current collector base material, but also can act with a negative active material, so that a bridge effect between the current collector and the active material is achieved; the stripping force of the pole piece is further enhanced, the problem of powder falling or lithium precipitation after long circulation of a conventional current collector is solved, the internal resistance of a battery cell is reduced, and the energy density of the battery cell is improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a composite current collector and a preparation method thereof. Background technique [0002] With the advancement of the national strategic goals of "carbon peaking" and "carbon neutrality", the development trend of new energy vehicles has become irreversible. As an important component of new energy vehicles, lithium batteries have received extensive attention. In addition to the four main materials of lithium-ion batteries, auxiliary materials also play a key role in the performance of lithium-ion batteries. At present, the foil used for the negative electrode of lithium battery is conventional smooth copper foil or carbon-coated copper foil, which can basically meet the performance requirements of conventional lithium ion batteries. [0003] CN104409696B discloses a preparation method of a lithium iron phosphate battery positive pole piece using an aqueous binder and a carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/13H01M10/0525H01M4/04
CPCH01M4/667H01M4/668H01M4/661H01M4/80H01M4/0492H01M4/0404H01M4/0411H01M4/13H01M10/0525H01M2004/027Y02E60/10
Inventor 王凯谭立波熊珊朱昌波易靖宇高夜军阮祝华
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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