Carbon nanotube conductive paste, preparation method thereof and lithium ion battery

A technology of conductive paste and carbon nanotubes, which is applied in the direction of battery electrodes, secondary batteries, carbon-silicon compound conductors, etc., can solve the problems of sedimentation and poor dispersion effect after standing still, and achieve less sedimentation, good conductivity, and good electrical conductivity. The effect of network uniformity

Active Publication Date: 2018-02-16
深圳市中科纳米科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of the existing carbon nanotube conductive paste, such as poor dispersion effect, subsidence, precipi

Method used

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  • Carbon nanotube conductive paste, preparation method thereof and lithium ion battery
  • Carbon nanotube conductive paste, preparation method thereof and lithium ion battery
  • Carbon nanotube conductive paste, preparation method thereof and lithium ion battery

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preparation example Construction

[0039] In one embodiment, the preparation method of the carbon nanotube conductive paste at least includes the following steps:

[0040] Step S01. Mixing the dispersant and the solvent so that the dispersant and the solvent are evenly mixed;

[0041] Step S02. Add the conductive functional body to the mixed solution obtained in the step S01 under stirring conditions, and perform pre-dispersion to obtain a premix;

[0042]Step S03. Grinding the premix to obtain carbon nanotube conductive paste.

[0043] In order to better understand the preparation method, the preparation method will be further explained below.

[0044] In step S01, the dispersant and the solvent are firstly mixed, which can save the preparation time of the slurry on the one hand, and on the other hand, enable the carbon nanotubes to be uniformly dispersed in the mixed solution formed by the dispersant and the solvent. When mixing the dispersant and the solvent, the stirring speed is 3000r / min-5000r / min, and ...

Embodiment 1

[0056] A carbon nanotube conductive paste, comprising the following components:

[0057]

[0058] Wherein, the diameter of the thin-diameter multi-walled carbon nanotubes is 5-40 nm, and the tube length is 30 μm-100 μm; the tube diameter of the thick-diameter multi-walled carbon nanotubes is 60-150 nm, and the tube length is 30 μm-100 μm.

[0059] The preparation method of described carbon nanotube conductive paste comprises the following steps:

[0060] (1) Add 9.35kg of methyl 3-methoxypropionate as a solvent carrier in a 15L container, and add 0.15kg of polyvinylpyrrolidone therein as a dispersant;

[0061] (2) Fully dissolve polyvinylpyrrolidone in methyl 3-methoxypropionate with a high-speed mixer under the condition of 5000r / min to obtain a mixed solution;

[0062] (3) Add 0.2 kg of multi-walled carbon nanotubes with thin tube diameter and 0.3 kg of multi-walled carbon nanotubes with thick tube diameter to the dissolved mixed solution, and then stir for 20 min under ...

Embodiment 2

[0065] A carbon nanotube conductive paste, comprising the following components:

[0066]

[0067] Wherein, the diameter of the thin-diameter multi-walled carbon nanotubes is 5-40 nm, and the tube length is 30 μm-100 μm; the tube diameter of the thick-diameter multi-walled carbon nanotubes is 60-150 nm, and the tube length is 30 μm-100 μm.

[0068] The preparation method of described carbon nanotube conductive paste comprises the following steps:

[0069] (1) Add 4.675kg of methyl 3-methoxypropionate and 4.675kg of ethylene glycol diacetate as a solvent carrier in a 15L container, add 0.15kg of polyvinylpyrrolidone therein as a dispersant;

[0070] (2) Fully dissolve polyvinylpyrrolidone in methyl 3-methoxypropionate and ethylene glycol diacetate with a high-speed mixer under the condition of 5000r / min to obtain a mixed solution;

[0071] (3) Add 0.2 kg of thin-diameter multi-walled carbon nanotubes and 0.3 kg of thick-diameter multi-walled carbon nanotubes to the dissolved...

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Abstract

The invention provides carbon nanotube conductive paste, a preparation method thereof and a lithium ion battery. The carbon nanotube conductive paste comprises the constituents based on 100 percent bymass: 0.5-10% of conductive functional body, 0.1-5% of dispersing agent and 85-97.5% of solvent, wherein the conductive functional body comprises a rough multi-walled carbon nanotube with a tube diameter being 40-150 nanometers and a fine multi-walled carbon nanotube with a tube diameter being 5-40 nanometers, the difference between the tube diameters of the rough multi-walled carbon nanotube andthe fine multi-walled carbon nanotube is more than or equal to 20 nanometers, the mass ratio of the rough multi-walled carbon nanotube and the fine multi-walled carbon nanotube is (8-2):(2-8), and the tube lengths of the rough multi-walled carbon nanotube and the fine multi-walled carbon nanotube are 30-100 micrometers. The carbon nanotube conductive paste provided by the invention has the characteristics of low settlement, no obvious layering, uniform conductive network and the like, the carbon nantoubes are uniformly dispersed, the volume resistivity is about 50 milliohm per centimeter, andthe viscosity is smaller than 15,000 mPa.s.

Description

technical field [0001] The invention belongs to the technical field of conductive paste, and in particular relates to a carbon nanotube conductive paste, a preparation method thereof, and a lithium ion battery. Background technique [0002] Carbon nanotubes are one-dimensional tubular nanomaterials rolled from single-layer or multi-layer graphite. Compared with traditional conductive agents such as carbon black and acetylene black, carbon nanotubes have higher electronic conductivity, and the required dosage is relatively small. Low, it is beneficial to improve the battery capacity, improve the cycle life of the battery, and especially help to improve the high rate charge and discharge performance of the battery, so it has an attractive application prospect in the lithium ion power battery conductive agent. Because of this, carbon nanotubes have become one of the main directions for the development of conductive agents for lithium-ion batteries. In practical applications, c...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525H01B1/04
CPCH01B1/04H01M4/625H01M10/0525Y02E60/10
Inventor 邓昌云李镇文傅兵鲁晓东
Owner 深圳市中科纳米科技有限公司
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