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Bipolar current collector modified by self-repairing conductive coating as well as preparation method and application of bipolar current collector

A technology of conductive coating and current collector, which is applied in the field of bipolar current collector and its preparation, can solve problems such as electrolyte leakage, seepage, battery short circuit, etc., to prevent internal short circuit, prevent penetration, and improve safety Effect

Pending Publication Date: 2022-04-15
DONGJIANG ENVIRONMENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the copper-aluminum composite foil film generally used in the current collector of the internal series high-voltage battery is very thin, and it is prone to tiny cracks or holes to cause electrolyte leakage. These flaws have both ion and electron transmission, resulting in internal short circuit. , which greatly reduces the electrical performance and safety performance of the battery
The current common solution is to prepare a polymer-metal composite current collector, but during long-term use, the electrolyte that penetrates into the metal-penetrating cracks and holes may still seep out through the metal-polymer interface, causing an internal short circuit in the battery.

Method used

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  • Bipolar current collector modified by self-repairing conductive coating as well as preparation method and application of bipolar current collector
  • Bipolar current collector modified by self-repairing conductive coating as well as preparation method and application of bipolar current collector
  • Bipolar current collector modified by self-repairing conductive coating as well as preparation method and application of bipolar current collector

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Experimental program
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preparation example Construction

[0036] The invention provides a method for preparing a bipolar current collector modified by a self-repairing conductive coating, comprising the following steps:

[0037] Preparation of microcapsules containing repairing agent;

[0038] preparing a slurry containing the microcapsules, catalyst, binder and conductive filler;

[0039] The slurry is coated on the surface of the current collector substrate to obtain a self-healing conductive bipolar current collector with coating.

[0040] The structure of the bipolar current collector prepared by this preparation method is as follows: figure 1 As shown, it includes a positive electrode material layer 10, a current collector layer 20, and a negative electrode material layer 30 from top to bottom. The current collector layer 20 includes a current collector matrix 25 and a self-healing conductive coating. Capsule 21, catalyst 22, binder 24 and conductive agent 23. figure 2 is a schematic diagram of the self-healing process of th...

Embodiment 1

[0052] This embodiment provides a self-healing conductive bipolar current collector, the current collector includes an aluminum foil and a self-healing conductive coating, and the self-healing conductive coating is coated on both sides of the aluminum foil. The self-healing conductive coating consists of phenylisocyanate / bisphenol A epoxy resin microcapsules, dibutyltin dilaurate catalyst, polyethylene and titanium powder. The preparation method of the self-repairing conductive bipolar current collector comprises the following steps:

[0053] Synthesis of 4,4'-methylenebis(phenylisocyanate) / dicyclopentadiene self-healing microcapsules by interfacial polymerization;

[0054] Weigh 20 parts of 4,4'-methylene bis(phenyl isocyanate) / bisphenol A epoxy resin microcapsules, 5 parts of dibutyltin dilaurate sodium catalyst catalyst, 5 parts of polyethylene and 50 parts of titanium powder Adding to the toluene solution in turn, every time one material is added to the solvent, it must b...

Embodiment 2

[0060] This embodiment provides a self-healing conductive bipolar current collector, the current collector includes a copper foil and a self-healing conductive coating, and the self-healing conductive coating is coated on the surface of the copper foil on one side. The self-healing conductive coating is composed of urea-formaldehyde resin / dicyclopentadiene microcapsules, Grubbs catalyst, nitrile rubber and carbon black. The preparation method of the self-repairing conductive bipolar current collector comprises the following steps:

[0061] Synthesis of urea-formaldehyde resin / dicyclopentadiene self-healing microcapsules by in situ polymerization:

[0062] Weigh 5 parts of urea-formaldehyde resin / dicyclopentadiene microcapsules, 0.1 part of Grubbs catalyst, 5 parts of nitrile rubber and 30 parts of carbon black and add them to the toluene solution in turn, and stir evenly when adding a material to the solvent Then add another material to finally get a uniform and stable slurry...

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Abstract

The invention relates to the technical field of batteries, in particular to a self-repairing conductive coating modified bipolar current collector and a preparation method and application thereof, and the technical scheme is characterized by comprising the following steps: preparing a microcapsule containing a repairing agent; preparing slurry containing the microcapsules, a catalyst, a binder and a conductive filler; and coating the slurry on the surface of a current collector base material to obtain the self-repairing conductive bipolar current collector with the coating. Under the condition that the current collector is perforated, the self-repairing microcapsules in the self-repairing conductive coating can be broken due to the action of external stress, the repairing agent can be released, and the repairing agent can be subjected to polymerization reaction immediately under the action of the catalyst to generate a self-repairing material; and the self-repairing material can quickly and accurately repair cracks or holes in the current collector layer, so that the permeation of electrolyte is prevented, the occurrence of a short circuit condition in the battery is prevented, and the safety of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, more specifically, it relates to a bipolar current collector modified by a self-repairing conductive coating and its preparation method and application. Background technique [0002] In order to achieve high voltage, traditional lithium-ion batteries usually use an internal parallel external string structure, which will increase the weight of the tabs, reduce the energy density of the battery and the efficiency of the group. Therefore, the advantage of preparing high-voltage batteries by internal series connection is obvious. However, the copper-aluminum composite foil film generally used in the current collector of the internal series high-voltage battery is very thin, and it is prone to tiny cracks or holes to cause electrolyte leakage. These defects have both ion and electron transmission, resulting in internal short circuit. , which greatly reduces the electrical performance and safety per...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525
CPCY02E60/10
Inventor 曾姗姗朱军强赵宗文玉增蒙徐文彬
Owner DONGJIANG ENVIRONMENTAL
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