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Carbon nanotube dispersion, negative electrode slurry comprising same, negative electrode, and lithium secondary battery

A technology of carbon nanotubes and single-walled carbon nanotubes, which is applied in the direction of secondary batteries, lithium batteries, negative electrodes, etc., can solve the problems of low dispersion, large volume change, agglomeration, etc., and achieve the effect of improving cycle characteristics

Pending Publication Date: 2021-11-02
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon nanotubes have the following problems: due to the high specific surface area of ​​carbon nanotubes, there is a strong van der Waals attraction between carbon nanotubes, so their dispersion is low, and agglomeration phenomenon may occur
However, silicon-based anode active materials are limited by poor cycle characteristics due to large volume changes during charge and discharge

Method used

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  • Carbon nanotube dispersion, negative electrode slurry comprising same, negative electrode, and lithium secondary battery
  • Carbon nanotube dispersion, negative electrode slurry comprising same, negative electrode, and lithium secondary battery
  • Carbon nanotube dispersion, negative electrode slurry comprising same, negative electrode, and lithium secondary battery

Examples

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preparation example Construction

[0064] The preparation of the mixture can be performed under temperature conditions in which the physical properties including the viscosity of the mixture are not changed due to the evaporation of the water-based solvent. For example, preparation of the mixture may be carried out at a temperature of 50°C or lower, eg, 5°C to 50°C.

[0065] In step (2), the mixture is subjected to dispersion treatment to prepare a carbon nanotube dispersion.

[0066] Grinding may be performed by a method using a ball mill, bead mill, discmill, basket mill or high pressure homogenizer, and More specifically, it can be performed by a grinding method using a disc grinder or a high pressure homogenizer.

[0067]When grinding by a disc mill, the size of the beads can be appropriately determined according to the type and amount of carbon nanotubes and the type of dispersant, and specifically, the diameter of the beads can be 0.1 mm to 5 mm, for example, 0.5 mm to 4mm. Also, the bead milling proce...

Embodiment 1

[0117] By adding 0.4% by weight the specific surface area is 1,160m 2 / g of single-walled carbon nanotubes (TUBALL, OCSiAl), 0.45% by weight polyvinylpyrrolidone (K15, Zhangzhou Huafu Chemical Co., Ltd.) as a polymer dispersant, as After mixing 0.15% by weight of tannic acid (Sigma-Aldrich Co.) of the phenolic compound, and water as a solvent to prepare 1 kg of the mixture, the mixture was used at 10,000 rpm using a high-shear in-line mixer Verso (Silverson) It was treated for 30 minutes and then treated four times using Micronox's PICOMAX equipment (high pressure homogenizer) at a pressure of 1,500 bar to prepare a carbon nanotube dispersion.

Embodiment 2

[0119] A carbon nanotube dispersion was prepared in the same manner as in Example 1, except that: 0.375% by weight of polyvinylpyrrolidone (K15, Zhangzhou Huafu Chemical Co., Ltd.) as a polymer dispersant, and A phenolic compound of two or more aromatic rings was mixed with 0.125% by weight of tannic acid (Sigma-Aldrich Co.).

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Abstract

The present invention relates to a carbon nanotube dispersion comprising: carbon nanotubes (CNT) having a Brunauer-Emmett-Teller (BET) specific surface area of 800 m<2> / g or more; a dispersant; and an aqueous solvent, wherein the dispersant comprises an amine-containing polymer dispersant and a phenolic compound containing two or more aromatic rings.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0102591 filed on August 21, 2019, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a carbon nanotube dispersion and a negative electrode slurry comprising the carbon nanotube dispersion, a negative electrode and a lithium secondary battery, and more particularly, to a carbon nanotube with low viscosity and little change in viscosity over time. Tube dispersion, negative electrode slurry including the carbon nanotube dispersion, and negative electrode and lithium secondary battery prepared by using the negative electrode slurry. Background technique [0004] With the technological development and increasing demand for mobile devices, the demand for secondary batteries as energy sources has greatly increased. Among these secondary batteries, lithium secondar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/587H01M4/133H01M4/134H01M10/0525B82Y30/00
CPCH01M4/625H01M4/386H01M4/587H01M4/133H01M4/134H01M10/0525B82Y30/00H01M2004/027C01B32/174H01M4/131Y02E60/10H01M10/052H01M4/483C01P2006/40
Inventor 金东炫刘兴植文日载崔相勳崔贤
Owner LG ENERGY SOLUTION LTD
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