Conductive slurry for battery pole piece, battery pole piece and battery

A technology of conductive paste and battery pole piece, which is applied in the direction of battery electrodes, lead-acid battery electrodes, non-aqueous electrolyte battery electrodes, etc. It can solve the problems of easy aggregation, stacking and even precipitation of conductive paste, and achieve the effect of easy storage

Active Publication Date: 2022-02-08
济南三川新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem that the conductive paste of conductive agent graphene and carbon nanotubes is easy to agglomerate, stack or even precipitate, the invention provides a conductive paste and a preparation method thereof

Method used

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  • Conductive slurry for battery pole piece, battery pole piece and battery
  • Conductive slurry for battery pole piece, battery pole piece and battery
  • Conductive slurry for battery pole piece, battery pole piece and battery

Examples

Experimental program
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Embodiment 1

[0030] This embodiment provides a preparation method of conductive paste, the preparation steps are as follows: figure 1 As shown, including steps S1 and S2:

[0031] S1: The liquid and the gas are dispersed through the gas-liquid dispersion method to form a gas-liquid mixed fluid;

[0032] S2: adding a conductive agent into the gas-liquid mixed fluid, stirring and / or, after ultrasonic treatment, to obtain a conductive paste.

[0033] Wherein, the conductive agent includes graphene and / or carbon nanotube; the liquid includes water, N-methylpyrrolidone (NMP), N,N-dimethylformamide (DMF), ethanol, isopropanol (IPA), butyl One of ketone (MEK) or toluene; the obtained gas-liquid mixed fluid contains fine bubbles, the particle size of the fine bubbles is less than 100 μm, and the concentration of the fine bubbles is greater than 10 6 pcs / ml; the type of gas in the fine bubbles includes one or more of air, oxygen, nitrogen, argon, hydrogen, helium or ozone.

[0034] The following...

Embodiment 2

[0036] This embodiment provides a conductive paste whose components are composed of graphene, fine air bubbles and water. The type of gas in the fine bubbles is air. Its preparation method comprises step 1) and step 2):

[0037] Step 1) forming a gas-liquid mixed fluid by air and water through a gas-liquid dispersion method;

[0038] Step 2) adding a certain mass of conductive agent graphene into the 1L gas-liquid mixed fluid obtained in step 1), stirring and ultrasonic treatment to obtain a conductive paste.

[0039] Wherein, the mass range of the added graphene is between 5g and 86g, and the mass fraction of the conductive agent is approximately between 0.5wt.% and 8wt.% of the obtained conductive paste. Preferably, the amount of graphene added is between 30g and 50g, so that the mass fraction of the conductive agent in the conductive paste is about 3wt.% to 5wt.%. In this concentration range, the conductive paste exhibits better viscosity.

Embodiment 3

[0041] This embodiment provides a conductive paste whose components are composed of graphene, carbon nanotubes, fine air bubbles and water. The type of gas in the fine bubbles is air. Its preparation method comprises step 1) and step 2):

[0042] Step 1) forming a gas-liquid mixed fluid by air and water through a gas-liquid dispersion method;

[0043] Step 2) adding a certain mass of conductive agent (graphene and carbon nanotubes) into the 1L gas-liquid mixed fluid obtained in step 1), and stirring to obtain a conductive paste.

[0044]Wherein, the mass range of the conductive agent (graphene and carbon nanotube) is between 5g and 86g, and the mass ratio of graphene and carbon nanotube is between 1:10 and 1:0.1. Preferably, the conductive agent (of graphene and carbon nanotubes) is added in a mass of 30 to 50 g, and the mass ratio of graphene and carbon nanotubes is between 1:1 and 1:0.5, and the conductive paste in this range exhibits better viscosity.

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Abstract

The invention discloses conductive slurry for a battery pole piece, the battery pole piece and a battery, the conductive slurry for the battery pole piece is composed of a conductive agent, a solvent and fine bubbles, and the conductive agent comprises graphene and carbon nanotubes; the particle size of the micro-bubbles is less than 100 microns, and the concentration of the micro-bubbles is greater than 106 / ml; and the mass content of the conductive agent is between 0.5 wt.% and 8 wt.%. When the obtained conductive paste is used in the actual battery electrode preparation process, the conductive paste containing the micro-bubbles is very easy to store and does not generate precipitates after being placed for several months, and the requirement that the conductive paste needs to be placed for a period of time in the storage and transportation process is met. The problem that the existing graphene dispersion liquid can be used only after dispersion treatment is avoided, and the graphene dispersion liquid can be directly used for preparing the electrode of the battery.

Description

[0001] This application is a divisional application, and its parent case is an invention patent application with an application date of September 11, 2019, an application number of 201910856863.1, and an invention title of "conductive paste and its preparation method". technical field [0002] The invention relates to the field of conductive materials, in particular to a conductive paste for battery pole pieces, battery pole pieces and batteries. Background technique [0003] Because graphene has the characteristics of ultra-high conductivity, ultra-thin two-dimensional, and high chemical stability, it is widely favored in battery conductive pastes. Graphene and active materials can be contacted through "surface-point". At the same time, carbon nanotubes also have high conductivity, and can contact active materials through "line-point" contact. At the same time, the composite conductive paste containing graphene and carbon nanotubes can realize "surface-line-point" contact, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/13H01M4/20B82Y30/00B82Y40/00H01M10/0525H01M10/06
CPCH01M4/625H01M10/06H01M4/04H01M4/14H01M4/16H01M10/12Y02E60/10
Inventor 杨树斌
Owner 济南三川新材料科技有限公司
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