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Aluminum foil with graphene for lithium battery and preparation method of aluminum foil

A technology of graphene and lithium batteries, which is applied in the direction of lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of reducing the charging and discharging efficiency of lithium-ion batteries, the active material is easy to fall off, and the interaction force is weak, etc., to achieve improved Corrosion effect, avoid excessive corrosion, increase the effect of bonding area

Active Publication Date: 2021-03-09
NOZO GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The positive current collector of lithium-ion batteries is usually aluminum foil, and active materials are attached to the aluminum foil. Most of the current active materials are adhered to the surface of the aluminum foil through adhesives. Due to the weak interaction between the active materials and the aluminum foil, the active materials It is easy to fall off during use, which will not only reduce the charging and discharging efficiency of the lithium-ion battery, but also lead to a lower battery life

Method used

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preparation example Construction

[0025] An embodiment of the present invention provides a method for preparing an aluminum foil with graphene for a lithium battery, comprising the following steps:

[0026] S1. Preparation of porous aluminum foil substrate

[0027] Clean the surface of the aluminum foil with a detergent to remove the lubricating film on the surface of the aluminum foil, and then clean it with deionized water.

[0028] Immerse the cleaned aluminum foil in the etchant and electrify it for corrosion solution. The corrosion solution includes 0.2-0.5mol / L HCl, 0.1-0.5mol / L H2O2, 0.1-0.3mol / L acetic alcohol, and the corrosion time is 1-3min , and then adding triethanolamine phosphate to a concentration of 1-1.2 mol / L for passivation for 2-5 minutes to obtain an aluminum foil substrate with a porous structure on the surface, that is, a porous aluminum foil substrate.

[0029] Chloride ions have a strong corrosive effect on aluminum foil under acidic conditions, and acetic alcohol can be used as a ca...

Embodiment 1

[0042] S101. Use a cleaning agent to clean the surface of the aluminum foil, remove the lubricating film on the surface of the aluminum foil, and then clean it with deionized water.

[0043] Immerse the cleaned aluminum foil in the etchant and electrify it for corrosion solution. The corrosion solution includes 0.5mol / L HCl, 0.5mol / L H2O2, and 0.1mol / L acetic alcohol. The corrosion time is 1min, and then add triethanolamine phosphate to the concentration Passivate at 1.2mol / L for 4min to obtain an aluminum foil substrate with a porous structure on the surface, that is, a porous aluminum foil substrate.

[0044] S102, preparing graphene aluminum foil

[0045] Put the porous aluminum foil substrate into the plasma vapor deposition equipment, vacuumize, raise the temperature of the porous aluminum foil substrate to 980°C, introduce inert gas mixed with methane, wherein the content of methane is 3%, the air flow rate is 50 sccm, and hydrogen gas is 500 sccm , the deposition time ...

Embodiment 2

[0050] S1. Preparation of porous aluminum foil substrate

[0051] Clean the surface of the aluminum foil with a detergent to remove the lubricating film on the surface of the aluminum foil, and then clean it with deionized water. Immerse the cleaned aluminum foil in an etchant and electrify it for corrosion. The corrosion solution includes 0.2mol / L HCl, 0.1mol / L H2O2, and 0.1mol / L acetic alcohol. The corrosion time is 3 minutes, and then triethanolamine phosphate is added to reach the concentration Passivate at 1 mol / L for 5 min to obtain an aluminum foil substrate with a porous structure on the surface, that is, a porous aluminum foil substrate.

[0052] S2, prepare graphene aluminum foil

[0053] Put the porous aluminum foil substrate into the plasma vapor deposition equipment, vacuumize, raise the temperature of the porous aluminum foil substrate to 980°C, introduce inert gas mixed with methane, wherein the content of methane is 6%, the gas flow rate is 50 sccm, and the hy...

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Abstract

The invention discloses an aluminum foil with graphene for a lithium battery and a preparation method of the aluminum foil, which relate to the field of lithium battery positive electrode materials. The method comprises the following steps of immersing the aluminum foil in a corrosive agent, electrifying to corrode, putting a porous aluminum foil substrate into plasma vapor deposition equipment, vacuumizing, heating to the temperature of 980-1000 DEG C of theporous aluminum foil substrate, introducing inert gas mixed with methane to obtain a graphene aluminum foil, splashing silver ions on thesurface of the graphene aluminum foil to obtain a silver-coated graphene aluminum foil, dissolving organic lithium, organic cobalt and organic manganese in a chitin solution to obtain a reaction solution, calcining the reaction solution in an inert gas environment with the temperature of 900-1000 DEG C for 1-2 hours, and naturally cooling to obtain carbon-coated lithium, cobalt and manganese oxides. The carbon is of a porous structure, and the silver-coated graphene aluminum foil is coated with the porous carbon after the porous carbon is mixed with an adhesive. Active substances can be prevented from falling off, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium batteries, in particular to an aluminum foil with graphene for lithium batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have high energy storage density, fast charging and discharging speed, high safety in use, and are more friendly to the environment. They are widely used in automobiles, medical care, and electronic products. The sheet has a relatively large relationship, and at the same time, the current collector corresponding to the pole sheet also has a relatively large relationship. [0003] The positive current collector of lithium-ion batteries is usually aluminum foil, and active materials are attached to the aluminum foil. Most of the current active materials are adhered to the surface of the aluminum foil through adhesives. Due to the weak interaction between the active materials and the aluminum foil, the active mate...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/70H01M10/052
CPCH01M4/661H01M4/663H01M4/667H01M4/70H01M10/052Y02E60/10
Inventor 蒙天庆
Owner NOZO GRP CO LTD
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