Carbon-coated aluminum foil and preparation method thereof

A technology of carbon-coated aluminum foil and aluminum foil, which is applied in the direction of electrode carriers/collectors, electrical components, battery electrodes, etc., can solve the problems of increased production costs, poor heat dissipation, and weak electrical conductivity, etc., to increase energy density and reduce poles. The effect of chemicalization and improvement of electrical conductivity

Inactive Publication Date: 2019-03-01
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first layer uses a super P layer, which has poor electrical conductivity. The three-layer c

Method used

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  • Carbon-coated aluminum foil and preparation method thereof
  • Carbon-coated aluminum foil and preparation method thereof
  • Carbon-coated aluminum foil and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0032] Example 1

[0033] An aluminum foil body, such as figure 1 As shown, the aluminum foil body 1, the CNT+Super P composite conductive layer 2 and the CNT conductive layer 3 are sequentially formed from the inside to the outside.

[0034] The preparation method of the carbon-coated aluminum foil is as follows:

[0035] 1) First, pre-treat the aluminum foil: use acetic acid to remove dirt and impurities on the surface of the aluminum foil;

[0036] 2) Mix the polytetrafluoroethylene and ethanol uniformly, then add CNT and Super P conductive agent, mix uniformly, and obtain a composite conductive slurry. Among them, the solid content of the composite conductive paste is 25%, the mass fraction of CNT is 15%, the mass fraction of Super P is 10%, the binder content is 5%, and the slurry viscosity is 250 mPa·S.

[0037] 3) Put the conductive slurry into the electrospinning device, adjust the electrospinning voltage to 20kV, and the solution flow rate to 2mL·h -1 , The distance between th...

Example Embodiment

[0043] Example 2

[0044] An aluminum foil body is composed of an aluminum foil body, a CNT+graphene composite conductive layer, and a CNT conductive layer 3 from the inside to the outside.

[0045] The preparation method of the carbon-coated aluminum foil is as follows:

[0046] 1) First, pre-treat the aluminum foil: use acetic acid to remove dirt and impurities on the surface of the aluminum foil;

[0047] 2) Mix the polytetrafluoroethylene and ethanol evenly, and then add the CNT and graphene conductive agent, and mix evenly to obtain a composite conductive paste. Among them, the solid content of the composite conductive paste is 15%, the mass fraction of CNT is 5%, the mass fraction of graphene is 10%, the binder content is 5%, and the slurry viscosity is 250 mPa·S.

[0048] 3) Put the conductive slurry into the electrospinning device, adjust the electrospinning voltage to 20kV, and the solution flow rate to 2mL·h -1 , The distance between the electrostatic spinning nozzle and the ...

Example Embodiment

[0051] Example 3

[0052] An aluminum foil body is composed of an aluminum foil body, a CNT+Super P+graphene composite conductive layer and a CNT conductive layer 3 from the inside to the outside.

[0053] The preparation method of the carbon-coated aluminum foil is as follows:

[0054] 1) First, pre-treat the aluminum foil: use acetic acid to remove dirt and impurities on the surface of the aluminum foil;

[0055] 2) Mix the polytetrafluoroethylene and ethanol evenly, and then add CNT, Super P and graphene conductive agent, and mix evenly to obtain a composite conductive paste. Among them, the solid content of the composite conductive paste is 30%, the mass fraction of CNT is 15%, the mass fraction of graphene is 10%, the mass fraction of Super P is 5%, the binder content is 5%, and the slurry viscosity is 250 mPa·S.

[0056] 3) Put the conductive slurry into the electrospinning device, adjust the electrospinning voltage to 20kV, and the solution flow rate to 2mL·h -1 , The distance b...

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Abstract

The invention discloses a carbon-coated aluminum foil and a preparation method thereof. The carbon-coated aluminum foil comprises an aluminum foil body, and the aluminum foil body comprises a composite conductive layer and a carbon nano tube (CNT) conductive layer, wherein the composite conductive layer and the CNT conductive layer are arranged outwards in sequence. The preparation method of the carbon-coated aluminum foil comprises the following steps that S1, the aluminum foil body is pretreated; S2, a binder and a solvent are mixed and stirred uniformly, then two or more conductive agents are added, uniform mixing is carried out, and composite conductive paste is obtained; S3, the composite conductive paste is loaded into an electrostatic spinning device, the aluminum foil body is sprayed, and then the first layer of composite carbon-coated aluminum foil is obtained by drying; S4, a binder and a solvent are mixed and stirred uniformly, a CNT conductive agent is added, uniform mixingis carried out, and CNT conductive paste is obtained; and S5, the CNT conductive paste is loaded into the electrostatic spinning device, the first layer of composite carbon-coated aluminum foil is sprayed with the CNT conductive layer, and the carbon-coated aluminum foil is obtained by drying. According to the carbon-coated aluminum foil and the preparation method thereof, the prepared double-layer coated carbon-coated aluminum foil improves the conductivity, the ratio performance and the cycle performance of the conductive agents and the aluminum foil body.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a carbon-coated aluminum foil and a preparation method thereof. Background technique [0002] With the increasing depletion of petrochemical energy sources, the greenhouse effect continues to intensify, forcing people to constantly search for a new type of environmentally friendly new energy that can not only slow down the energy crisis, but also avoid environmental pollution. Therefore, lithium-ion batteries are used as the power of electric vehicles. The aluminum foil current collector has the function of attaching active materials and conducting electronic conduction in lithium batteries. In the currently used carbon-coated aluminum foil, the carbon-coated layer is generally composed of a single layer of conductive graphite and carbon black particles. The carbon-coated layer can reduce the contact resistance and polarization. However, as the requirements f...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCH01M4/661H01M4/663H01M4/667Y02E60/10
Inventor 赵春阳娄忠良李瑞法
Owner 桑顿新能源科技(长沙)有限公司
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