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Method for directly preparing carbon nanotube composite conductive agent

A technology of carbon nanotube compounding and nanotube compounding, applied in the direction of carbon-silicon compound conductors, etc., can solve problems such as difficult industrial mass production and difficult dispersion of carbon nanotubes

Inactive Publication Date: 2012-10-31
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that a well-dispersed carbon nanotube suspension must first be prepared
Due to agglomeration and mutual entanglement, carbon nanotubes are difficult to disperse. Ultrasonic dispersion is usually used in the presence of a dispersant. However, due to limitations in the power of ultrasonic equipment and noise, this technology is difficult to achieve industrialized mass production.

Method used

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  • Method for directly preparing carbon nanotube composite conductive agent
  • Method for directly preparing carbon nanotube composite conductive agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh LaNiO 3 Catalyst 2 grams, Super P 20 grams, using a high-speed mixer to mix the two evenly as a catalyst, with 80L of CH per hour 4 / H 2 (Volume ratio 40 / 100) mixed gas is made raw material gas, and in fixed-bed reactor, 700 ℃ of reaction 1 hour, make the carbon nanotube containing catalyst and Super P mixture initial product 34 grams, initial product is with 2N hydrochloric acid 1000mL in Purify at 60°C for 6 hours, cool, filter, wash until neutral, and dry the filter cake to obtain 32 grams of carbon nanotube composite conductive agent. The calculated weight ratio of carbon nanotubes to SuperP is 3:5. The SEM photos of the samples are shown in figure 1 .

Embodiment 2

[0017] Weigh 2 grams of Co / MgO catalyst with a Co content of 9%, and 20 grams of acetylene black, and use a high-speed mixer to mix the two evenly as a catalyst, and use 80 L of CH per hour 4 / H 2 (Volume ratio 40 / 100) mixed gas is made raw material gas, and in fixed-bed reactor, 650 ℃ reacted 1 hour, made the carbon nanotube that contains catalyst and acetylene black mixture initial product 30 grams, initial product is with 2N hydrochloric acid 1000mL in Purify at 60°C for 6 hours, filter and wash to neutral after cooling, and dry the filter cake to obtain 28 grams of carbon nanotube composite conductive agent. The calculated weight ratio of carbon nanotubes to acetylene black is 2:5.

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Abstract

The invention discloses a method for directly manufacturing a carbon nanotube composite conductive agent. The method comprises the following steps: first, uniformly mixing a catalyst and conductive carbon particles used for preparing the carbon nanotubes; then using the mixture as a catalyst and producing a primary product of containing a carbon nanotube composite conductive agent as well as the catalyst by a chemical gas-phrase precipitation method; at last, removing active ingredients and a carrier of the catalyst from the primary product containing the carbon nanotube composite conductive agent with a diluted acid and / or diluted base, separating, washing and neutralizing the carbon nanotube composite conductive agent and drying the carbon nanotube composite conductive agent by a spray drying method or the prior method of filtering first and then drying to obtain the carbon nanotube composite conductive agent. The method avoids the use of an ultrasonic dispersion device in the preparation of a composite of a carbon nanotube and carbon particles, and is suitable for mass production of carbon nanotube composite conductive agent.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube composite conductive agent for a lithium ion battery, belongs to the field of inorganic nanomaterial preparation, and is particularly suitable for preparing carbon nanotubes by a catalytic chemical vapor deposition method. Background technique [0002] Carbon nanotubes with a fibrous structure have obvious advantages when used as a conductive agent for lithium-ion batteries: it has high crystallinity and good electrical conductivity; the aspect ratio is large, the diameter is on the order of nanometers, and the length is on the order of microns, which is conducive to An effective conductive network is formed in the electrode, and it can fix the electrode active material and combine with the electrode sheet, and play the role of a physical binder; the specific surface area is large, and it has a porous structure, which is easy to absorb and hold the electrolyte, providing for the electrod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02H01B1/04
Inventor 于作龙周固民张庆堂瞿美臻
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI