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Graphene-coated battery tab structure adapting to high-power work, and manufacturing method thereof

A technology of battery tabs and manufacturing methods, which is applied in the field of new energy and energy storage devices, can solve problems such as inability to improve resistance rise, and achieve the effect of slowing growth and thickening

Pending Publication Date: 2017-12-15
湖南秒冲新能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned carbon-coated aluminum foil or carbon-coated copper foil coated with carbon on the current collector is only coated with a carbon layer in the area of ​​the current collector to be coated with an electrode layer, and this type of coating is carried out in the original blank tab area. Blanking is still carried out during carbon modification, that is, the reserved tab area is still an uncoated blank foil
Therefore, this type of current collector carbon coating technology does not involve the modification of the tab area. The tab area of ​​the pole piece using this carbon-coated aluminum foil is no different from that of ordinary uncoated foils, and cannot be improved. The problem of resistance rise of blank foil tabs under high power working conditions

Method used

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  • Graphene-coated battery tab structure adapting to high-power work, and manufacturing method thereof
  • Graphene-coated battery tab structure adapting to high-power work, and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mix and disperse graphene with D50=0.1 μm and styrene-butadiene rubber in pure water at a weight ratio of 5:95 to make a slurry, and coat the left and right sides of a 400 cm wide current collector aluminum foil with a 5 cm wide pre Leave both sides of the tab area, and after drying, obtain an aluminum foil pre-coated with the tab area, and the dry thickness of the coating is 0.01 μm per side. The aluminum foil is coated with a positive electrode material layer on the area other than the tab area, and a lithium ion battery is prepared according to the conventional process for making a lithium ion battery, wherein the tab is connected to the aluminum guide pin by riveting. Charge and discharge 50,000 times at a rate of 10C, and record the increase rate of the internal resistance of the battery ((internal resistance after charging and discharging - internal resistance before testing) / internal resistance before testing × 100%).

Embodiment 2

[0023] Mix and disperse graphene with D50=20μm and styrene-butadiene rubber in pure water at a weight ratio of 5:95 to make a slurry, and coat it on the left and right sides of a 400cm-wide current collector aluminum foil with a width of 5cm by a gravure roller. The two sides of the tab area are dried to obtain an aluminum foil pre-coated with the tab area, and the dry thickness of the coating is 0.5 μm per side. The aluminum foil is coated with a positive electrode material layer on the area other than the tab area, and a lithium ion battery is prepared according to the conventional process for making a lithium ion battery, wherein the tab is connected to the aluminum strip by welding. Charge and discharge 50,000 times at a rate of 10C, and record the increase rate of the internal resistance of the battery ((internal resistance after charging and discharging - internal resistance before testing) / internal resistance before testing × 100%).

Embodiment 3

[0025] Double-coat the positive electrode layer of the lithium-ion battery within the central 300cm wide band of the 400cm-wide current collector aluminum foil to make a pole piece, and then coat D50=50μm graphite on both sides of the reserved tab area with a width of 5cm on the left and right. The slurry prepared by mixing ethylene and sodium carboxymethyl cellulose in pure water at a weight ratio of 20:80 is coated by gravure coating with a dry thickness of 1 μm per side. The obtained pole piece is prepared into a lithium ion battery according to the conventional process for making a lithium ion battery, wherein the tab is connected to the aluminum strip by welding. Charge and discharge 50,000 times at a rate of 10C, and record the increase rate of the internal resistance of the battery ((internal resistance after charging and discharging - internal resistance before testing) / internal resistance before testing × 100%).

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Abstract

The invention relates to a graphene-coated battery tab structure adapting to high-power work, and a manufacturing method thereof. The graphene-coated battery tab structure comprises a tab foil of a non-electrode material layer on a pole plate of a lithium ion battery, a supercapacitor or a lithium ion capacitor, and the surface of the tab foil is attached with a graphene coating. The e tab foil is attached with the graphene coating used for protection in order to prevent or reduce the growth thickening of an oxide film on the surface of the foil under a high-power work heating condition.

Description

technical field [0001] The invention relates to a tab structure applicable to lithium-ion batteries, supercapacitors and lithium-ion capacitors, which is suitable for high-power work, and belongs to the field of new energy and energy storage devices. Background technique [0002] The tabs of existing energy storage devices such as lithium-ion batteries, supercapacitors, and lithium-ion capacitors are blank aluminum foil areas without electrode layers on the pole pieces, which are used to connect with the leads of external circuits such as metal guide pins, metal foils, Metal belt or metal mesh for connection. Generally speaking, the connection between the lug and the lead-out end is welded or riveted, and the electrode layer is not coated on the lug to meet the requirements of welding or riveting. The specially reserved tabs can be located at both ends of the pole piece or in the middle or any area in the middle to meet the design requirements of current convergence. Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M10/0525H01G11/26H01M50/531
CPCH01M10/0525H01G11/26H01M50/531Y02E60/13Y02E60/10
Inventor 李荐
Owner 湖南秒冲新能源科技有限责任公司