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Aluminum foil for battery as well as preparation method and preparation device of aluminum foil

An aluminum foil and battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of accelerated battery life attenuation, easy peeling from aluminum foil, excessive polarization, etc., to improve electrical conductivity and thermal conductivity, Manufacturing cost savings, effect of reducing pole piece impedance

Pending Publication Date: 2021-08-31
DALIAN CBAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aluminum foil can be used as a positive electrode collector for lithium-ion secondary batteries, but there are the following problems: first, there is contact resistance at the interface between aluminum foil and positive electrode active material, resulting in excessive polarization and heavy heat generation during charging and discharging; The bonding force between the active material and the conductive agent is weak. As the charge and discharge progress, the volume of the active material continuously collides and shrinks, and it is easy to peel off from the aluminum foil, which accelerates the attenuation of battery capacity and life; finally, the electrolyte reacts with the aluminum foil, further Accelerated battery life decay
[0004] Carbon-coated aluminum foil is divided into two types: water-based and oil-based. It is to coat the dispersed carbon black, carbon nanotubes and other conductive carbon materials on the aluminum foil. Since these conductive carbon materials have poor dispersibility in the solvent system, the prepared coated In the carbon aluminum foil process, it is difficult to coat the coating evenly and finely on the aluminum foil, which reduces the bonding strength between the coating and the aluminum foil and the stability of the current collector. Lithium-ion batteries made of this carbon-coated aluminum foil Cyclic diving is very easy to occur during the secondary battery cycle

Method used

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  • Aluminum foil for battery as well as preparation method and preparation device of aluminum foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 provides a kind of device for preparing aluminum foil for batteries (partial reference figure 1 ), including an unwinding shaft 1, a transfer shaft 2, a corona treatment unit 3, a carbon coating unit 5, a carbon curing unit 9, a heat treatment device 12, and a winding shaft 13 arranged in sequence;

[0045] The corona treatment unit 3 includes a corona device 4;

[0046] The carbon coating unit 5 includes a paraffin cracking device 7, an air inlet 6 and an air outlet 8;

[0047] The carbon solidification unit 9 includes a laser generator 11 and a cooling device 10 .

Embodiment 2

[0049] The method for preparing an aluminum foil for a battery using the device described in Example 1 specifically comprises the following steps:

[0050] (1) Unwinding: unwind the 12 μm thick aluminum foil through the unwinding shaft 1, and then transfer it to the corona treatment unit 3 by the transfer shaft 2, with a tape speed of 100m / s;

[0051] (2) Corona treatment: carry out high-voltage corona treatment on the lower surface of the aluminum foil through the corona equipment 4, the power of the corona equipment 4 is 25KW, the voltage is 12KV, and the frequency is 20KHZ. After the high-voltage corona treatment, the dyne value on the surface of the aluminum foil reaches 38dyn;

[0052] (3) Carbon coating: the aluminum foil after corona treatment is transferred to the carbon coating unit 5, and after passing through the paraffin cracking equipment 7, a layer of 1 μm thick pyrolytic carbon is adsorbed on the lower surface of the aluminum foil to form a carbon coating layer; ...

Embodiment 3

[0059] The method for preparing an aluminum foil for a battery using the device described in Example 1 specifically comprises the following steps:

[0060] (1) Unwinding: Unwind the 12 μm thick aluminum foil through the unwinding shaft 1, and then transfer it to the corona treatment unit 3 by the transfer shaft 2, with a tape speed of 90m / s;

[0061] (2) Corona treatment: carry out high-voltage corona treatment on the lower surface of the aluminum foil through the corona equipment 4, the power of the corona equipment 4 is 25KW, the voltage is 12KV, and the frequency is 20KHZ. After the high-voltage corona treatment, the dyne value on the surface of the aluminum foil reaches 38dyn;

[0062] (3) Carbon coating: the aluminum foil after corona treatment is transferred to the carbon coating unit 5, and after passing through the paraffin cracking equipment 7, a layer of 1 μm thick pyrolytic carbon is adsorbed on the lower surface of the aluminum foil to form a carbon coating layer; t...

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Abstract

The invention provides an aluminum foil for a battery as well as a preparation method and a preparation device thereof. The aluminum foil for the battery comprises an aluminum foil, an Al4C3 layer and a carbon coating layer which are sequentially connected from bottom to top; the thickness of the Al4C3 layer ranges from 10 nm to 250 nm. The thickness of the carbon coating layer is 0.1 to 5 [mu] m. According to the aluminum foil for the battery, the bonding strength of the carbon coating and the aluminum foil and the stability of a current collector are improved, the electrical conductivity and the thermal conductivity of the carbon coating are improved, the impedance of a pole piece is reduced, meanwhile, due to the fact that a traditional drying process is omitted in the preparation process, the manufacturing cost is saved by 30-40%, solvent materials such as NMP which pollutes the environment are not adopted in the manufacturing process, and the aluminum foil is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of preparing aluminum foil for batteries, and in particular relates to an aluminum foil for batteries, a preparation method and a preparation device thereof. Background technique [0002] Aluminum foil can be used as a positive electrode collector for lithium-ion secondary batteries, but there are the following problems: first, there is contact resistance at the interface between aluminum foil and positive electrode active material, resulting in excessive polarization and heavy heat generation during charging and discharging; The bonding force between the active material and the conductive agent is weak. As the charge and discharge progress, the volume of the active material continuously collides and shrinks, and it is easy to peel off from the aluminum foil, which accelerates the attenuation of battery capacity and life; finally, the electrolyte reacts with the aluminum foil, further Accelerated the decay o...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/661H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 王元杰薄晋科宫颂
Owner DALIAN CBAK POWER BATTERY CO LTD