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Surface modified current collector and preparation method and application thereof

A surface modification and current collector technology, which is applied in electrode collector coating, electrode manufacturing, electrode carrier/collector, etc., can solve problems such as reducing the mechanical strength of current collectors, damage to the surface of current collectors, and affecting battery life. , to achieve the effect of improving electron collection ability, enhancing surface activity and increasing effective contact area

Active Publication Date: 2019-10-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion process will cause certain surface damage to the current collector and reduce the mechanical strength of the current collector, which will seriously affect the service life of the battery.

Method used

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  • Surface modified current collector and preparation method and application thereof
  • Surface modified current collector and preparation method and application thereof
  • Surface modified current collector and preparation method and application thereof

Examples

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Effect test

preparation example Construction

[0032] One aspect of the embodiments of the present invention provides a method for preparing a surface-modified current collector, which includes:

[0033] provide a substrate;

[0034] Using magnetron sputtering technology to deposit and form MoS on the surface of the substrate 2 / metal composite film to obtain a surface-modified current collector, the MoS 2 / metal composite film including MoS 2 / Ag composite film, MoS 2 / Ti composite film and MoS 2 / Pb composite film, etc., or a combination of two or more, but not limited thereto.

[0035] In some embodiments, the preparation method includes: using magnetron sputtering technology, MoS 2 The target and the metal target are used as the target material, and the protective gas is used as the working gas, and a negative bias is applied to the substrate, and the MoS 2 The target and the metal target apply a target current to deposit and form MoS on the surface of the substrate 2 / metal composite film.

[0036] Further, ...

Embodiment 1

[0056] A copper current collector for negative electrodes of lithium-ion batteries, using magnetron sputtering to modify MoS on the surface of copper foil 2 / Ag composite film. The method for preparing a copper current collector for a negative electrode of a lithium ion battery comprises the following steps:

[0057] (1) Cleaning: the size is 13.5×30cm 2 , the copper foil with a thickness of 9 μm was wiped flat with ethanol and then blown dry with dry nitrogen;

[0058] (2) Sample loading: Put the processed copper foil into the vacuum chamber of the multifunctional magnetron sputtering equipment and fix it, and pre-evacuate the vacuum chamber to 3.0×10 -5 Pa;

[0059] (3) Pre-sputtering: Start the magnetron sputtering pre-sputtering program to remove the oxide layer on the surface of the copper foil to improve the bonding force between the copper foil and the deposited material;

[0060] (4) Deposition: Start the magnetron sputtering deposition program and turn on MoS 2 t...

Embodiment 2

[0064] A copper current collector for negative electrodes of lithium-ion batteries, using magnetron sputtering to modify MoS on the surface of copper foil 2 / Ti composite film. The method for preparing a copper current collector for a negative electrode of a lithium ion battery comprises the following steps:

[0065] (1) Cleaning: the size is 13.5×30cm 2 , the copper foil with a thickness of 11 μm was wiped flat with ethanol and then blown dry with dry nitrogen;

[0066] (2) Sample loading: Put the processed copper foil into the vacuum chamber of the multifunctional magnetron sputtering equipment and fix it, and pre-evacuate the vacuum chamber to 5.0×10 -4 Pa;

[0067] (3) Pre-sputtering: Start the magnetron sputtering pre-sputtering program to remove the oxide layer on the surface of the copper foil to improve the bonding force between the copper foil and the deposited material;

[0068] (4) Deposition: Start the magnetron sputtering deposition program and turn on MoS 2 ...

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Abstract

The invention discloses a surface modified current collector and a preparation method and an application thereof. The preparation method comprises the steps of providing a substrate; depositing a MoS2 / metal composite film on the surface of the substrate by adopting a magnetron sputtering technology to obtain a surface modified current collector, wherein the MoS2 / metal composite film includes a MoS2 / Ag composite film, a MoS2 / Ti composite film, a MoS2 / Pb composite film and the like. The MoS2 / metal composite film prepared by the magnetron sputtering method not only increases the surface roughnessof the substrate and enhances the bonding power between an active substance and the current collector, but also reduces the contact resistance, improves the electronic conductivity, optimizes the electrochemical dynamics between interfaces, facilitates improving the electron collection capability and suppressing the interface diffusion of Li<+> and can effectively improve the performance of the lithium ion battery. In addition, the preparation method is mature in process, can uniformly deposit in a large area, has small damage to the shape and structure of the substrate, and has high treatment efficiency and wide application prospects.

Description

technical field [0001] The invention relates to a surface-modified current collector, a preparation method and application thereof, and belongs to the technical field of lithium-ion batteries. Background technique [0002] With the depletion of chemical energy, the new energy industry is playing an increasingly important role in the national economy. In order to adapt to the development needs of the new era, the requirements for energy storage devices are getting higher and higher. Among many secondary power supply technologies, lithium-ion batteries have excellent characteristics such as high energy density, high working voltage, long cycle life, and small self-discharge. performance has attracted widespread attention. Lithium-ion batteries are mainly composed of battery shells, current collectors, active materials, diaphragms, electrolytes and other components. In order to improve the overall performance of lithium-ion batteries / capacitors, we usually conduct improvement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525H01M4/04C23C14/06C23C14/35
CPCC23C14/0688C23C14/352H01M4/0404H01M4/667H01M10/0525Y02E60/10
Inventor 姜欣朱小波许晓雄彭爱平王立平薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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