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Composite current collector for negative electrode of lithium ion battery and preparation method of composite current collector

A technology of lithium ion battery and current collector, applied in the field of composite current collector for lithium ion battery negative electrode and its preparation, can solve problems such as poor binding force and insufficient corrosion resistance, achieve stable performance, easy access, and increase interface binding force Effect

Pending Publication Date: 2022-08-05
SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a composite current collector for lithium-ion battery negative electrode with high corrosion resistance and high interfacial bonding strength and its preparation method, so as to solve the problems of poor bonding between layers of the composite structure and insufficient corrosion resistance in the prior art. question

Method used

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  • Composite current collector for negative electrode of lithium ion battery and preparation method of composite current collector
  • Composite current collector for negative electrode of lithium ion battery and preparation method of composite current collector
  • Composite current collector for negative electrode of lithium ion battery and preparation method of composite current collector

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Embodiment 1

[0033] The present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner, so they only show the structures related to the present invention. Meanwhile, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] Example 1

[0035] A composite current collector for lithium ion battery negative electrode, in single-chamber vacuum magnetron sputtering coating equipment, adopts the following steps to prepare:

[0036] (1) Select a polyethylene terephthalate film (PET) sheet with a thickness of 8 mm as the base material 101, use alcohol for cleaning, and quickly blow off the residual alcohol with high-purity nitrogen, thereby removing the PET base material 101 S...

Embodiment 2

[0047] A composite current collector for lithium ion battery negative electrode, in single-chamber vacuum magnetron sputtering coating equipment, adopts the following steps to prepare:

[0048] (1) Select a polyethylene terephthalate film (PET) sheet with a thickness of 8 mm as the base material 101, use alcohol for cleaning, and quickly blow off the residual alcohol with high-purity nitrogen, thereby removing the PET base material 101 Surface dust and oil;

[0049] (2) The equipment chamber is evacuated until the background vacuum is lower than 5E-3Pa, the temperature is reduced to 50°C, and the air pressure is maintained at 0.07Pa by feeding argon; the PET substrate 101 is placed on the sample holder, and the sample holder is sent to into the chamber; apply a bias voltage of -650V to the sample holder for ion etching cleaning, the cleaning current is 0.4A, and the cleaning time is 20min, so as to remove the oil stains and impurities on the surface of the PET substrate, and i...

Embodiment 3

[0059] A composite current collector for lithium ion battery negative electrode, in single-chamber vacuum magnetron sputtering coating equipment, adopts the following steps to prepare:

[0060] (1) Select a polyimide film (PI) sheet with a thickness of 10 mm as the base material 101 , use alcohol for cleaning, and use high-purity nitrogen to quickly blow off the residual alcohol, so as to remove the dust and oil on the surface of the PI base material 101 ;

[0061] (2) The equipment chamber is evacuated until the background vacuum is lower than 5E-3Pa, the temperature is lowered to 30°C, and the air pressure is maintained at 0.07Pa by feeding argon; the PI substrate 101 is placed on the sample holder, and the sample holder is sent to Into the chamber; apply -200V bias to the sample holder for ion etching cleaning, cleaning current 0.2A, cleaning time 10min, in order to remove oil and impurities on the surface of PI substrate, and increase the surface roughness of the substrate...

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Abstract

The invention provides a composite current collector for a negative electrode of a lithium ion battery and a preparation method of the composite current collector. The composite current collector comprises a base material layer located in the center, and a first metal layer, a second metal layer, a transition layer and a non-metal layer which are sequentially stacked and deposited outwards from the upper surface and the lower surface of the base material layer, the first metal layer is made of metal chromium, nickel or titanium, or one of chromium alloy, nickel alloy and titanium alloy; the second metal layer is made of one of copper, aluminum, nickel, titanium, niobium or iron; the nonmetal layer is made of one of lamellar graphite, carbon nanotubes, acetylene black, graphene and carbon fibers; and the transition layer is made of a mixture of a second metal layer material and a non-metal layer material. The composite current collector is stable in material performance and good in corrosion resistance, and does not react with electrolyte, active substances and the like; the cost is low, the used raw materials are easy to obtain, and the preparation 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 composite current collector for negative electrodes of lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, no memory effect, and environmental friendliness, and have been widely used in electronic communication, transportation, energy storage and other fields. In lithium-ion batteries, the current collector is an extremely important component. As the support structure of the positive and negative materials, it not only plays the role of carrying active materials, but also collects the electrons generated by the electrochemical reaction and leads them to the external circuit. So as to realize the process of converting chemical energy into electrical energy. Therefore, the current collector performance has a non-negligible impact on ...

Claims

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Application Information

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IPC IPC(8): H01M4/66C23C14/06C23C14/16C23C14/24C23C14/35
CPCH01M4/667H01M4/661H01M4/662H01M4/663H01M4/66C23C14/16C23C14/165C23C14/24C23C14/35C23C14/0605Y02E60/10
Inventor 毕飞飞杨帆李骁博姜天豪胡鹏蓝树槐
Owner SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD