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A current collector and its preparation method and application

A fluid-collecting and integrated technology, which is applied in the direction of electrode carriers/collectors, non-aqueous electrolyte battery electrodes, structural parts, etc., can solve problems such as bad, difficult to weld, and affect the actual promotion and application of composite current collectors, so as to save production costs , reduce the internal resistance, and avoid the effect of increasing the impedance of the welding point

Active Publication Date: 2021-09-28
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the subsequent welding between the current collectors or the welding between the current collectors and the external tabs, there will be technical problems that are difficult to weld or poorly welded, which seriously affects the practical application of the composite current collector.

Method used

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  • A current collector and its preparation method and application
  • A current collector and its preparation method and application
  • A current collector and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The current collector of this embodiment is prepared according to the following method:

[0088] Take two rolls of metal foil (aluminum foil with a thickness of 2 μm), wash the two rolls of metal foil with 0.001g / L phosphoric acid solution for 5 minutes, then wash with 0.001g / L sodium hydroxide solution for 5 minutes, and then wash with deionized water for 1 minute , and finally washed with dimethyl carbonate for 1 min and dried in the air.

[0089] Take one of the rolls of pretreated metal foil, by controlling the coated area, use a coater to apply a coating machine on the first area 3 of the metal foil (the first area 3 and the second area 4 are along the extending direction of the metal foil) distribution in the vertical direction) corresponding to the surface coated with the first adhesive layer 6 (polyurethane adhesive with a thickness of 0.1 μm, Wuxi Bo’ai Adhesive Factory), through an extrusion casting compound machine (the extrusion temperature of the equipment ...

Embodiment 2

[0094] The current collector of this embodiment is prepared according to the following method:

[0095] Take two rolls of metal foil (aluminum foil with a thickness of 3 μm), wash the two rolls of metal foil with 0.5g / L phosphoric acid solution for 0.5min, then wash with 0.5g / L sodium hydroxide solution for 0.5min, and then pass through deionized water Wash for 30 minutes, and finally wash with acetone for 30 minutes and dry in air.

[0096] Take one of the rolls of pretreated metal foil, and by controlling the coated area, use a coater to spread the metal foil between the first area and the first area (the first area and the second area are along the direction perpendicular to the extending direction of the metal foil) Distribution) corresponding to the surface coated with the first adhesive layer (polyurethane adhesive with a thickness of 1 μm, Wuxi Boai Adhesive Factory), through the extrusion casting compound machine (equipment extrusion temperature is set to 284 ° C) in the...

Embodiment 3

[0100] The current collector of this embodiment is prepared according to the following method:

[0101] Take two rolls of metal foil (aluminum foil with a thickness of 1 μm), wash the two rolls of metal foil with 0.1g / L phosphoric acid solution for 1min, then wash with 0.1g / L sodium hydroxide solution for 1min, and then wash with deionized water for 10min , and finally washed with absolute ethanol for 10 min, and dried in the air.

[0102] Take one of the rolls of pretreated metal foil, and by controlling the coated area, use a coater to spread the metal foil between the first area and the first area (the first area and the second area are along the direction perpendicular to the extending direction of the metal foil) distribution) corresponding to the surface coated with the first adhesive layer (polyacrylic resin adhesive with a thickness of 0.5 μm, Wuxi Bo’ai Adhesive Factory), and passed through the extrusion casting compound machine (the extrusion temperature of the equip...

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Abstract

The invention provides a current collector, a preparation method and application thereof. The current collector includes a first metal layer and a second metal layer stacked, at least one first region and at least one second region are included between the first metal layer and the second metal layer, the first region and the second metal layer The two areas are distributed at intervals in the first direction; the first area is provided with a polymer layer, and the polymer layer is respectively bonded to the first metal layer and the second metal layer through an adhesive layer. The current collector of the present invention not only has a high welding yield, can effectively save the production cost of the lithium-ion battery, but also can reduce the internal resistance of the lithium-ion battery, so that the cycle performance and safety performance of the lithium-ion battery are significantly improved.

Description

technical field [0001] The invention relates to a current collector, a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. Background technique [0002] The current collectors of conventional lithium-ion batteries are mostly made of metal foil. The positive electrode is usually made of metal aluminum foil, and the negative electrode is usually made of metal copper foil. However, once a short circuit occurs inside the battery, the current cannot be cut off, which will eventually lead to heat accumulation and then thermal runaway. . [0003] In recent years, some researchers have used a new type of current collector to replace the conventional metal current collector. This new type of current collector usually uses a non-conductive polymer film as the substrate, and a layer of metal is plated on both sides of the substrate by vacuum evaporation, electroplating, etc. For example, metal aluminum is plated on both sides of PE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/13H01M4/72H01M10/0525
CPCH01M4/72H01M4/667H01M4/661H01M4/13H01M10/0525Y02E60/10B32B7/12B32B15/09B32B15/20B32B27/36B32B2250/03B32B2250/40B32B2250/44B32B2255/06B32B2255/10B32B2255/26B32B2307/202B32B2307/732B32B2457/10H01M4/668H01M4/75
Inventor 赵伟李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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