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 electrica

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] The present invention provides a bipolar current preparation method for self-repair conductive coating modifications, including the following steps:

[0037] Preparation of microcapsules containing repair agents;

[0038] A slurry containing the microcapsules, catalysts, binders, and conductive filler is prepared;

[0039] The slurry was applied to the surface of the current collector substrate to obtain a self-study conductive bipolar collector having a coating.

[0040] The structure of the bipolar collector obtained by the preparation method is as figure 1 As shown, from top to bottom, the positive electrode material layer 10, the current collector layer 20, and the negative electrode material layer 30, the current collector layer 20 includes a collector substrate 25 and a self-repairing conductive coating, the self-repairing conductive coating comprising self-repairing micro The capsule 21, the catalyst 22, the binder 24, and the conductive agent 23 are composed. figure...

Example Embodiment

[0051] Example 1

[0052] This embodiment provides a self-modified conductive bipolar collector comprising an aluminum foil and a self-repairing conductive coating, self-repairing conductive coating is coated on the surface of the aluminum foil. The self-repair conductive coating is composed of a phenyl isocyanate / bisphenol A epoxy resin microcapsules, dibutyl tin, sodium silicate catalyst, polyethylene, and titanium powder. The preparation method of the self-repairing conductive bipolar collector includes the steps of:

[0053] 4,4'-methylene bis (phenylisocyanate) / bicyclopentaded diene self-repairing microcapsules were combined with interface polymerization method.

[0054] Since 20 parts of 4,4'-methylene bis (phenyl isocyanate) / bisphenol A epoxy resin microcapsules, 5 parts of dibutyl Tin sodium silicate catalyst catalyst, 5 parts of polyethylene and 50 parts of titanium powder In sequential solution, the toluene solution was added, and each of the materials were added t...

Example Embodiment

[0059] Example 2

[0060] This embodiment provides a self-modified conductive bipolar collector comprising a copper foil and a self-repairing conductive coating, self-repairing conductive coating is self-repairing the surface of the copper foil. The self-repairing conductive coating is composed of urea resin / bicyclopentadiene microcapsules, GRUBBS catalyst, nitrile rubber and carbon black. The preparation method of the self-repairing conductive bipolar collector includes the steps of:

[0061] Using an in-situ polymerization synthesis of urethenimaldehyde resin / double cyclopentadiene self-repair microcapsules:

[0062] 5 parts of a urea resin / bicyclopentadiene microcapsule, 0.1 parts of GRUBBS catalyst, 5 parts of butyronitrile rubber and 30 parts of carbon black were added to the toluene solution, and each time the solvent added a material, stirred evenly. After adding another material, eventually get a uniform stable slurry:

[0063] The obtained slurry was coated on one s...

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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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