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

A conductive paste, carbon nanotube technology, applied in battery electrodes, secondary batteries, carbon-silicon compound conductors, etc., can solve the problems of sedimentation, poor dispersion effect, etc., to achieve less sedimentation, good electrical conductivity, and technology. Simple and actionable effects

Active Publication Date: 2021-05-07
深圳市中科纳米科技有限公司
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  • Summary
  • 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, precipitation and stratification, etc., the present invention provides a carbon nanotube conductive paste and a preparation method thereof

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  • Carbon nanotube conductive paste and preparation method thereof and lithium ion battery
  • Carbon nanotube conductive paste and preparation method thereof and lithium ion battery
  • Carbon nanotube conductive paste and 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 a carbon nanotube conductive paste, a preparation method thereof and a lithium ion battery. The carbon nanotube conductive paste includes: 0.5-10% conductive functional body; 0.1-5% dispersant; 85-97.5% solvent; Multi-walled carbon nanotubes with a tube diameter and multi-walled carbon nanotubes with a tube diameter of 5 to 40nm, and the difference between the tube diameters of the multi-walled carbon nanotubes with a thick and thin tube diameter is ≥ 20nm, and the multi-walled carbon nanotubes with a thick tube diameter and The mass ratio of the thin-diameter multi-walled carbon nanotubes is (8-2):(2-8), and the tube lengths of the thick-diameter and thin-diameter multi-walled carbon nanotubes are 30-100 μm. The carbon nanotube conductive paste provided by the invention has the characteristics of uniform dispersion of carbon nanotubes, less sedimentation and no obvious layering, a volume resistivity of about 50mΩ.cm, a viscosity of less than 15000mPa·s, and a uniform conductive network.

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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Patent Type & Authority Patents(China)
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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