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Current collector, lithium ion battery and preparation method thereof

A lithium-ion battery and current collector technology, applied in the field of lithium-ion batteries, can solve problems such as difficulty in resisting deformation of battery pole pieces, inability to apply lithium-ion batteries, and difficulty in resisting electrolyte erosion, etc., to achieve enhanced adhesion and enhanced stability , the effect of ensuring integrity

Inactive Publication Date: 2022-04-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interface between the metal coating and the polyimide substrate is poorly bonded, resulting in weak interaction between the two, and it is difficult to resist the deformation of the battery pole piece during rolling.
In addition, the patent CN 111900413A uses a polymer cross-linking agent as an intermediate coating to improve the bonding force between the metal coating and the substrate layer, but this type of binder is difficult to resist the erosion of the electrolyte, so it cannot be applied to lithium-ion batteries

Method used

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  • Current collector, lithium ion battery and preparation method thereof
  • Current collector, lithium ion battery and preparation method thereof
  • Current collector, lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation method of the current collector provided in Example 1 of the present invention comprises the following steps:

[0045] (1) First, the surface of the commercial polymer membrane is cleaned to remove impurities on the surface.

[0046] (2) Plasma treatment is performed on the dried film substrate to activate both the upper and lower surfaces, which is beneficial to increase its binding force with the reinforcing layer.

[0047] (3) The film substrate layer is placed in a primer coating machine to prepare an adhesive reinforcement layer, and the adhesive used is a composite coating of CMC and silicon oxide. Wherein, the content of silicon oxide is 10%, and the solid content of silicon oxide and CMC is 50%.

[0048] (4) Place the thin film reinforced by the binder on the substrate of magnetron sputtering to prepare 800nm ​​metal aluminum to obtain the required current collector.

[0049] (5) The commercialized NCM523 is used as an active material, a binder...

Embodiment 2

[0052] The preparation method of the current collector provided in Example 2 of the present invention comprises the following steps:

[0053] (1) First, the surface of the commercial polymer membrane is cleaned to remove impurities on the surface.

[0054] (2) Plasma treatment is performed on the dried film substrate for use, so that both the upper and lower surfaces are activated, which is beneficial to increase its binding force with the reinforcing layer.

[0055] (3) Place the film substrate layer in a primer coater to prepare an adhesive reinforcement layer, and the adhesive used is a composite coating of SBR and silicon oxide. Among them, the content of alumina is 10%, and the solid content of alumina and SBR is 50%.

[0056] (4) Place the thin film base material strengthened by the binder on the magnetron sputtering substrate to prepare 800nm ​​metal aluminum to obtain the required current collector.

[0057] (5) The commercialized NCM523 is used as an active material...

Embodiment 3

[0059] The preparation method of the current collector provided in Example 3 of the present invention comprises the following steps:

[0060] (1) First, the surface of the commercial polymer membrane is cleaned to remove impurities on the surface.

[0061] (2) Plasma treatment is performed on the dried film substrate for use, so that both the upper and lower surfaces are activated, which is beneficial to increase its binding force with the reinforcing layer.

[0062] (3) The film substrate layer is placed in a primer coater to prepare an adhesive reinforcement layer, and the adhesive used is a composite coating of PAA and silicon oxide. Wherein, the content of titanium oxide is 10%, and the solid content of titanium oxide and PAA is 50%.

[0063] (4) Place the thin film base material strengthened by the binder on the magnetron sputtering substrate to prepare 800nm ​​metal aluminum to obtain the required current collector.

[0064] (5) The commercialized NCM523 is used as an ...

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Abstract

The invention belongs to the related technical field of lithium ion batteries, and discloses a current collector, a lithium ion battery and a preparation method thereof.The current collector comprises a base material layer, enhancement layers and a metal layer, the enhancement layers are arranged on the two opposite surfaces of the base material layer respectively, and the metal layer is arranged on the enhancement layers. The metal layer is arranged on the surface, away from the base material layer, of the reinforcing layer, and the reinforcing layer is made of compound emulsion containing organic and inorganic filler. Therefore, the commercial copper foil or aluminum foil can be effectively thinned by the polymer base material layer, so that the energy density of the battery is improved, the current collector can resist the corrosion of electrolyte in actual production or use by using the composite enhancement layer, and the structural integrity is ensured.

Description

technical field [0001] The invention belongs to the technical field related to lithium-ion batteries, and more specifically relates to a current collector, a lithium-ion battery and a preparation method thereof. Background technique [0002] Metal foils (copper foil and aluminum foil) have been widely used as electrode collectors in current commercial lithium-ion batteries, but the high density of metal foils seriously affects the energy density of batteries; at the same time, the contact between positive and negative current collectors The internal short circuit also greatly reduces the safety of the battery. Therefore, researchers have conducted a lot of research on the improvement of current collectors. For example, patent CN110600745A discloses a copper-plated composite current collector based on polyimide film, which shows good cycle performance and rate. At the same time, the electrical insulation properties of polyimide have improved the thermal runaway of the batter...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525H01M10/058B32B7/12B32B15/00B32B15/04B32B27/00B32B27/06B32B33/00
CPCY02P70/50
Inventor 伽龙黄云辉刘志康汪茹
Owner HUAZHONG UNIV OF SCI & TECH
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