Carbon nanotube paste for lithium battery and preparation method for carbon nanotube paste

A carbon nanotube and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of carbon nanotubes being difficult to disperse, and achieve the effects of improving electrical conductivity, good mixing effect, and improved dispersion degree.

Inactive Publication Date: 2016-05-04
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a carbon nanotube slurry for lithium batteries and a preparation method thereof, which solves the problem that carbon nanotubes are difficult to disperse in lithium battery applications, maximizes the dispersion effect of carbon nanotubes, and further improves the high current of lithium batteries Discharge performance, etc.

Method used

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  • Carbon nanotube paste for lithium battery and preparation method for carbon nanotube paste
  • Carbon nanotube paste for lithium battery and preparation method for carbon nanotube paste

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Taking the oily carbon nanotube slurry and its preparation method as an example, its formula and steps are as follows.

[0020] A carbon nanotube slurry for lithium batteries, the formula used is: carbon nanotube: carbon black: polyvinylpyrrolidone: nitrogen methylpyrrolidone = 6wt%: 3wt%: 1.2wt%: 89.8wt%. Among them, the diameter of carbon nanotubes is 7~15nm, the length is 6~15μm, and the specific surface area is 260m 2 / g. Carbon black particle size is 30~50nm, specific surface area is 60m 2 / g.

[0021] The mixing and stirring process includes dry powder premixing, solution preparation, slurry premixing and stirring, and mixing mode circulation stirring. The specific steps are as follows:

[0022] (1) Dry powder premixing: weigh carbon nanotubes and carbon black to 6Kg and 3Kg respectively, and then premix in a powder mixer for 40 minutes;

[0023] (2) Solution preparation: weigh the surfactant polyvinylpyrrolidone to 1.2Kg, add it into the solvent after weighin...

Embodiment 2

[0028] Taking the water-based carbon nanotube slurry and its preparation method as an example, its formula and steps are as follows.

[0029] The formula used is: carbon nanotube: carbon black: polyacrylate copolymer: sodium carboxymethyl cellulose: deionized water=3wt%: 1wt%: 0.5wt%: 0.2wt%: 95.3wt%. Among them, the diameter of carbon nanotubes is 12~25nm, the length is 13~25μm, and the specific surface area is 160m 2 / g. Carbon black particle size is 40~60nm, specific surface area is 40m 2 / g.

[0030] The mixing and stirring process includes dry powder premixing, solution preparation, slurry premixing and stirring, and mixing mode circulation stirring. The specific steps are as follows:

[0031] (1) Dry powder premixing: weigh carbon nanotubes and carbon black to 3Kg and 1Kg respectively, and then premix in a powder mixer for 30 minutes;

[0032] (2) Solution preparation: weigh the surfactant polyvinylpyrrolidone and the thickener sodium carboxymethyl cellulose, the mas...

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Abstract

The invention discloses a carbon nanotube paste for a lithium battery and a preparation method for the carbon nanotube paste. The carbon nanotube paste comprises the ingredients of carbon nanotubes, carbon black, a surfactant, a thickening agent and a solvent, wherein the ratio of carbon nanotube: carbon black: surfactant: thickening agent: solvent is (3-10wt%): (0-8wt%): (0.1-1.3wt%): (0-1wt%): (80-96wt%); and the uniformly-dispersed uniform carbon nanotube paste is prepared based on the ratio through a mixing and stirring process. Under the effects of the surfactant and the thickening agent, a high-speed mechanical stirring mode and an ultrasonic stirring mode are combined, so that the dispersion degree of the conductive agent is greatly improved; and pre-fabrication for the paste is carried out for the carbon nanotube conductive agent that is difficult to disperse, so that a relatively good dispersion effect is achieved, the stirring requirement in the next step applied to the battery paste is lowered, and a relatively good mixing effect can be realized.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a carbon nanotube slurry for lithium batteries and a preparation method thereof. Background technique [0002] Due to the advantages of high energy density, small self-discharge, and excellent cycle performance, lithium-ion batteries are widely used in backup power supplies, energy storage devices, electric vehicles, electric bicycles, and power tools. [0003] Especially as a power battery application, the comprehensive performance requirements of the battery are relatively high. In order to improve the high-current discharge capacity of the battery, reduce the internal resistance of the battery, and improve the cycle life of the battery, carbon black and carbon nanofibers are added to the positive and negative materials of the battery. , carbon nanotubes and other conductive agents. Among them, carbon nanotubes have good electrical conductivity. In practical applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 关成善宗继月李涛王勇周会张敬捧
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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