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Vertical graphene-copper foil composite current collector based on in-situ growth and preparation method thereof

An in-situ growth and graphene technology, applied in the direction of electrode carrier/current collector, active material electrode, non-aqueous electrolyte battery electrode, etc., can solve the problem of uneven contact between active material and copper foil surface, and the bonding strength between copper foil and active material Poor, poor wettability between negative electrode and electrolyte, to achieve the effect of being suitable for large-scale production, improving cycle stability and life, and improving overall conductivity

Inactive Publication Date: 2019-08-30
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional negative electrode current collector material uses copper foil with a smooth surface, and the electrode active material is directly coated on the surface of the copper foil. However, due to the limitations of the nature of the copper foil itself, the copper foil current collector still has certain shortcomings: (1) Copper foil The bonding strength with the active material is poor, and it is easy to fall off, resulting in battery failure; (2) The contact between the active material and the surface of the copper foil is uneven, mostly point contact, so the conductivity is poor and the internal resistance is large; (3) Made of copper foil The wettability between the negative electrode and the electrolyte is poor, and the contact area is small, which leads to serious polarization of the battery

Method used

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  • Vertical graphene-copper foil composite current collector based on in-situ growth and preparation method thereof
  • Vertical graphene-copper foil composite current collector based on in-situ growth and preparation method thereof
  • Vertical graphene-copper foil composite current collector based on in-situ growth and preparation method thereof

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Embodiment 1

[0025] A method for preparing a vertical graphene-copper foil composite current collector based on in-situ growth, comprising the following steps:

[0026] (1) Pretreatment of copper foil:

[0027] Clean the copper foil with a thickness of 20-60 μm with acetone solution and absolute ethanol solution for 20 minutes, then place the cleaned copper foil in a HCl solution with a concentration of 0.25 mol / L, and place it in a water bath at 60°C for 20 minutes , to obtain pretreated copper foil;

[0028] (2) Preparation of layered nano-copper-copper foil: the pretreated copper foil is placed in a vacuum evaporation coating machine, at a temperature lower than 1×10 -4 Vacuum evaporation was carried out under the condition of Pa, and 80nm thick nano-copper was evaporated on the surface of the copper foil. The size range of the nano-copper particles was 350nm, and the evaporation was repeated 5 times to obtain a layered nano-copper-copper foil material;

[0029] (3) In situ growth of ...

Embodiment 2

[0043] A method for preparing a vertical graphene-copper foil composite current collector based on in-situ growth, comprising the following steps:

[0044](1) Pretreatment of copper foil:

[0045] The copper foil with a thickness of 40 μm was ultrasonically cleaned with acetone solution and absolute ethanol solution for 20 minutes, and then the cleaned copper foil was placed in a HCl solution with a concentration of 0.25 mol / L, and it was bathed in a water bath at 60 ° C for 20 minutes to obtain Pretreated copper foil;

[0046] (2) Preparation of layered nano-copper-copper foil: the pretreated copper foil is placed in a vacuum evaporation coating machine, at a temperature lower than 1×10 -4 Vacuum evaporation was carried out under the condition of Pa, and 85nm thick nano-copper was evaporated on the surface of the copper foil. The size range of the nano-copper particles was 380nm, and the evaporation was repeated 4 times to obtain a layered nano-copper-copper foil material; ...

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Abstract

The invention discloses a vertical graphene-copper foil composite current collector based on in-situ growth and a preparation method thereof and belongs to the technical field of a lithium ion battery. The current collector is advantaged in that the vertical graphene-copper foil composite current collector is prepared in situ by plasma enhanced chemical vapor deposition, the prepared graphene-copper foil composite current collector has a micron-sized petal-like structure with a contact angle range of 125-143.5 DEG, has super hydrophobic and lipophilic properties, can effectively improve infiltration between the current collector and an active material interface, increases the contact surface and increases bonding strength, so the active material is not easy to fall off, and thereby interface impedance is reduced, infiltration of a negative electrode prepared by the current collector and the electrolyte is facilitated, the electrolyte is in sufficient contact with the negative electrodeactive material, the contact area is enhanced, and battery polarization is reduced. The method is advantaged in that operation is simple, cost is relatively low, and the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a vertical graphene-copper foil composite current collector based on in-situ growth. Background technique [0002] Lithium-ion batteries have been widely used in communications, automobiles, aerospace and other fields due to their outstanding advantages such as high energy density and power density, long cycle life, and good stability. However, with the development of technology and the proposal of actual needs, lithium-ion batteries also need further improvement and improvement. In the lithium-ion battery system, the current collector is an essential component. It is not only a carrier of active substances, but also plays a role in converging current to form a larger current output. Therefore, it is required that the current collector is in full contact with the active material and has a strong binding force so that it can be f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13
CPCH01M4/13H01M4/661H01M4/663H01M4/667H01M2004/027Y02E60/10
Inventor 张伟张家豪刘昕刘小飞王东邓霆张晓宇郑伟涛
Owner JILIN UNIV
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