Aluminum foil/carbon composite current collector, its preparation method and lithium ion battery

A lithium-ion battery and current collector technology, applied in the field of electrochemistry, can solve the problems of battery stability and life reduction, damage to aluminum foil, technical complexity, etc., to improve cycle stability and life, reduce contact internal resistance, and simple preparation process Effect

Active Publication Date: 2016-12-21
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, aluminum foil is generally used as the positive current collector material of lithium-ion batteries, but the contact resistance between the aluminum foil and the active material layer is too large, and lithium ions and aluminum foil will undergo lithium intercalation reactions, which will destroy the aluminum foil, resulting in reduced battery stability and life.
Therefore, the more commonly used method is to coat the surface of aluminum foil with a conductive carbon layer to reduce the contact resistance, but the bonding between the conductive coating and the aluminum foil is achieved by an adhesive, and the bonding force is not strong enough, and the conductive carbon layer technology has been adopted. Mastered by a few companies in Japan, the technology is complicated and the cost is high

Method used

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  • Aluminum foil/carbon composite current collector, its preparation method and lithium ion battery

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preparation example Construction

[0018] Preparation of aluminum foil / carbon composite current collector:

[0019] The preparation method of aluminum foil / carbon composite current collector of the present invention roughly comprises the following steps:

[0020] (a) Decontamination and drying: First, use ethanol, acetone and deionized water to remove the oil stains on the aluminum foil in an ultrasonic cleaner, and dry it in a drying oven at 80-100°C for 5-10 minutes. The thickness of aluminum foil is generally commonly used 9um, 12um, 16um (industry standard).

[0021] (b) Ion implantation: take out the dried aluminum foil, put it into the ion implantation equipment, seal the ion implantation equipment and pass one of nitrogen, helium or argon as a protective gas, and use the method of high-speed ion implantation. Carbon elements are implanted into one side of the aluminum foil to obtain an aluminum foil / carbon composite current collector, wherein the amount of ion implantation is 1×10 -6 ~1×10 -4 g / cm 2 ...

Embodiment 1

[0040] The preparation method of the aluminum foil / carbon composite current collector in Example 1 of the present invention comprises the following steps:

[0041] (a) Decontamination and drying: First, use ethanol, acetone and deionized water to sonicate the aluminum foil in an ultrasonic cleaner to remove oil stains, and then dry it in a vacuum drying oven at 80°C for 5 minutes;

[0042] (b) Ion implantation: take out the dried aluminum foil, put it into the ion implantation equipment, seal the equipment and feed nitrogen gas as a protective gas, and use high-speed ion implantation to inject carbon elements into one side of the aluminum foil to obtain aluminum foil / Carbon composite current collector, wherein the amount of ion implantation is 1×10 -6 / cm 2 , the injection time is 20 minutes, and the injection energy is 800eV;

[0043](c) Corrosion and drying: After the ion implantation is completed, let the equipment cool down to room temperature naturally, open the cover,...

Embodiment 2

[0045] The preparation method of the aluminum foil / carbon composite current collector in Example 2 of the present invention comprises the following steps:

[0046] (a) Decontamination and drying: First, use ethanol, acetone and deionized water to sonicate the aluminum foil in an ultrasonic cleaner to remove oil stains, and then dry it in a vacuum drying oven at 100°C for 5 minutes;

[0047] (b) Ion implantation: take out the dried aluminum foil, put it into the ion implantation equipment, seal the equipment and pass helium gas as a protective gas, and use high-speed ion implantation to inject carbon elements into one side of the aluminum foil to obtain the aluminum foil / carbon composite current collector, wherein the amount of ion implantation is 1×10 -4 / cm 2 , the injection time is 1 minute, and the injection energy is 1500eV;

[0048] (c) Corrosion and drying: After the ion implantation is completed, let the equipment cool down to room temperature naturally, open the co...

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Abstract

The invention relates to an aluminum foil / carbon composite current collector and a preparation method thereof. The preparation method comprises the following steps: (a) decontaminating and drying; (b) injecting ions; (c) corroding and drying. The invention also relates to a lithium ion battery which is prepared by using the aluminum foil / carbon composite current collector. According to the preparation method of the aluminum foil / carbon composite current collector and the lithium ion battery which is prepared by using the aluminum foil / carbon composite current collector, a carbon layer and the aluminum foil are embedded mutually and tightly bonded through ion injection, so that the natural transition between the carbon and the aluminum is realized; a contact inner resistance between the carbon layer and the aluminum foil is reduced; the performance of a carbon-aluminum composite layer is better than that a carbon-coated layer; the preparation process is simple; the cost is low; after corroding, an uneven surface is formed on the carbon-aluminum composite layer, so that a bonding force between a positive electrode material and the aluminum foil / carbon composite current collector can be increased; the cycle stability of the electrode can be improved; the service life of the electrode can be prolonged; after 1000 cycles, a capacity retention ratio can reach up to 97.1%.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an aluminum foil / carbon composite current collector and a preparation method thereof. The invention also relates to a lithium ion battery using the aluminum foil / carbon composite current collector as an electrode material. Background technique [0002] At present, aluminum foil is generally used as the positive current collector material of lithium-ion batteries, but the contact resistance between the aluminum foil and the active material layer is too large, and lithium ions and aluminum foil will undergo lithium intercalation reaction, which will destroy the aluminum foil, resulting in reduced battery stability and life. Therefore, the more commonly used method is to coat the surface of aluminum foil with a conductive carbon layer to reduce the contact resistance, but the bonding between the conductive coating and the aluminum foil is achieved by an adhesive, and the bonding forc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/661H01M4/663H01M4/666H01M10/0525Y02E60/10
Inventor 周明杰袁新生王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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