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Water-based conductive adhesive for lithium battery and preparation method thereof

A conductive adhesive and water-based adhesive technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of inability to fully utilize the conductive properties of the conductive agent on the positive or negative main material, and damage the capacity of the positive or negative main material Make full use of performance, uneven dispersion of conductive agent and binder, etc., to achieve the effect of being conducive to large-scale production, adapting to environmental protection trends, and saving pulping time

Inactive Publication Date: 2020-05-08
YANYI NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are three main categories of binders widely used in lithium-ion batteries: polyvinylidene fluoride (PVDF for short), styrene-butadiene rubber (SBR for short), sodium carboxymethyl cellulose (CMC for short), Among them, PVDF is mainly used for oil-based positive electrodes of lithium-ion batteries, and N-methylpyrrolidone (NMP for short) is used as a solvent, which is not environmentally friendly and has a high cost; SBR and CMC are mainly used for water-based negative electrodes of lithium-ion batteries. , the dosage is large, and the adhesion is poor. At the same time, the battery made by using it has a great internal resistance, and there are certain problems with the dispersion performance of nanomaterials. In addition, the above-mentioned binders are not conductive, and the battery production The factory needs to add additional conductive agent to the positive electrode or negative electrode electrode slurry in the process of making lithium batteries, which makes the battery manufacturing process cumbersome and easily causes the main material of the positive and negative electrodes, the conductive agent and the binder. Uneven dispersion, unable to give full play to the advantages of the conductive agent on the conductive properties of the positive or negative main material, or the adhesion of the electrode is not high enough, easy to drop powder, destroy the capacity performance of the positive or negative main material itself, and cause Poor battery cycle performance

Method used

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  • Water-based conductive adhesive for lithium battery and preparation method thereof
  • Water-based conductive adhesive for lithium battery and preparation method thereof
  • Water-based conductive adhesive for lithium battery and preparation method thereof

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Embodiment 1

[0027] The invention provides a water-based conductive binder for lithium ions, including carbon nanotubes and a water-based binder, specifically, including 0.01-0.8 parts by weight of single-walled carbon nanotubes, 1-10 parts by weight of multi-walled carbon nanotubes and 10 to 50 parts by weight of water-based binder; the water-based binder includes PAA polyacrylic acid, PAN polyacrylonitrile, SBR styrene-butadiene rubber, CMC methylcellulose and other lithium-ion batteries with good dispersibility Water-based binder for positive and negative electrodes. In this specific embodiment, the water-based binder is PAA polyacrylic acid.

[0028] The outer diameter of the single-walled carbon nanotubes is 0.4 to 40 nm, and the wall thickness is Length ≥ 1 μm. The outer diameter of the multi-walled carbon nanotubes is 2 to 20 nm, and the thickness of the tube wall is The length is between 500nm and 10cm. The aspect ratio (ratio of length to diameter) of the single-walled carbo...

Embodiment 2

[0033] The difference between this embodiment 2 and the embodiment 1 is that the lithium ion water-based conductive binder of the present invention also includes a dispersant whose mass is 0.2-100 times the total amount of carbon nanotubes.

[0034] The dispersant is a nonionic polymer compound or ionic cellulose gum or ionic polyacrylic acid; the nonionic polymer compound adopts polyvinylpyrrolidone (PVP for short), and the ionic cellulose gum adopts carboxymethyl Base cellulose sodium (CMC-Na), the ionic polyacrylic acid adopts PAA mixture, and the PAA mixture adopts commercially available products, such as the LA133 product of Chengdu Yindile Power Technology Co., Ltd.

[0035] The present invention also provides a kind of preparation method of lithium ion water-based conductive binder, comprising the following steps:

[0036] Step 1. Take 0.4 parts by mass of single-walled carbon nanotubes and 5 parts of multi-walled carbon nanotubes, add them to a PVP dispersant whose mass ...

Embodiment 3

[0041] The difference between this specific embodiment 3 and embodiment 1 is: the lithium ion water-based conductive binder of the present invention also includes 0.5 to 10 parts by mass of auxiliary conductive materials, and the auxiliary conductive materials are graphene and vapor-phase grown carbon fibers. (VGCF), high density conductive carbon black (SP), at least one of conductive carbon black. In this specific embodiment, the auxiliary conductive material is graphene.

[0042] The present invention also provides a kind of preparation method of lithium ion water-based conductive binder, comprising the following steps:

[0043] Step 1. Take 0.01 parts of single-walled carbon nanotubes, 1 part of multi-walled carbon nanotubes, and 10 parts of graphene in parts by mass, and add them to 50 parts of water-based binder. Inject nitrogen to form a nitrogen atmosphere. The solution is impacted on one side by a low-pressure homogenizer at a low pressure of 200 bar to 1000 bar, an...

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Abstract

The invention provides a water-based conductive adhesive for a lithium battery, and the adhesive comprises 0.01-0.8 part of single-walled carbon nanotube, 1-10 parts of multi-walled carbon nanotube and 10-50 parts of water-based adhesive, wherein the outer diameter of the single-walled carbon nanotube is 0.4-40nm, and the thickness of the tube wall of the single-walled carbon nanotube is greater than or equal to 1[mu]m; the outer diameter of the multi-walled carbon nanotube is 2-20nm, and the thickness of the tube wall of the multi-walled carbon nanotube is 500nm-10cm; and the length-diameterratio of the single-walled carbon nanotube to the multi-walled carbon nanotube is greater than or equal to 1,000nm. The water-based conductive adhesive for the lithium battery, which is prepared by adopting a simple process of one-step synthesis and one-step dispersion, has the properties of electric conduction, adhesion and dispersion, is low in dosage, and can reduce the internal resistance of the battery, improve the adhesion force of a pole piece and improve the cycle performance of the battery; in addition, the preparation cost of the water-based conductive adhesive is low, water is usedas a solvent in the whole process, and the water-based conductive adhesive conforms to the trend of environmental protection.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a water-based conductive binder for lithium batteries and a preparation method thereof. Background technique [0002] At present, there are three main categories of binders widely used in lithium-ion batteries: polyvinylidene fluoride (PVDF for short), styrene-butadiene rubber (SBR for short), sodium carboxymethyl cellulose (CMC for short), Among them, PVDF is mainly used for oil-based positive electrodes of lithium-ion batteries, and N-methylpyrrolidone (NMP for short) is used as a solvent, which is not environmentally friendly and has a high cost; SBR and CMC are mainly used for water-based negative electrodes of lithium-ion batteries. , the dosage is large, and the adhesion is poor. At the same time, the battery made by using it has a great internal resistance, and there are certain problems with the dispersion performance of nanomaterials. In addition, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/622H01M4/625H01M10/0525Y02E60/10
Inventor 陈巧刘俊岳敏王伟华
Owner YANYI NEW ENERGY TECH CO LTD
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