Preparation method of winding-free carbon nanotube for lithium ion battery

A technology of lithium-ion batteries and carbon nanotubes, applied in the direction of carbon nanotubes, nanocarbons, secondary batteries, etc., can solve the problems of low purity, poor conductivity, carbon tube winding, etc., and achieve the effect of high purity

Inactive Publication Date: 2020-10-02
赣州市康达新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low purity, poor conductivity and serious entanglement between carbon tubes faced by the carbon nanotube conductive agent currently applied to the positive electrode material of lithium-ion batteries, the purpose of the present invention is to provide a high-purity carbon nanotube suspension and Its preparation method, the prepared carbon nanotubes have high purity and less metal impurities, which eliminates the influence of acid treatment and high temperature treatment on carbon nanotubes in the later stage; the prepared carbon nanotubes are neatly arranged without entanglement, without dispersants and ultra-high The shear force can be well dispersed in the organic solvent NMP, avoiding the difficulties faced by the later use of complex processes to disperse carbon nanotubes

Method used

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  • Preparation method of winding-free carbon nanotube for lithium ion battery
  • Preparation method of winding-free carbon nanotube for lithium ion battery
  • Preparation method of winding-free carbon nanotube for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Step (1): Select a silicon wafer polished on one side as a substrate, and clean it with ultrasonic vibration in deionized water, acetone and isopropanone in sequence before use. This is for immediate application without chemical cleaning or surface polishing.

[0048] Step (2): At room temperature, aluminum oxide is used as a target material, the radio frequency power is set to 150 W, the sputtering pressure is 11 sccm and the reaction is performed for 5 minutes to obtain a 25 nm thick aluminum oxide film by sputtering.

[0049] Step (3): After reactive magnetron sputtering alumina, iron / yttrium alloy was used as the target (the ratio of iron and yttrium was 95:5), at 25°C, the DC sputtering power was set to 100W, and the sputtering The air pressure was 12 sccm and the reaction was carried out for 5 minutes to obtain a catalyst iron yttrium thin film with a thickness of 30 nm.

[0050] Step (4): Put the prepared catalyst precursor into a tube furnace, feed in 500 sccm ...

Embodiment 2

[0055] Step (1) select a silicon wafer polished on one side as a substrate, and clean it with ultrasonic vibration in deionized water, acetone and isopropanone in sequence before use. This is for immediate application without chemical cleaning or surface polishing.

[0056] Step (2) At room temperature, silicon oxide is used as a target material, the radio frequency power is set to 150W, the sputtering pressure is 11 sccm and the reaction is performed for 5 minutes to obtain a silicon oxide film with a thickness of 35nm by sputtering.

[0057] Step (3) After reactive magnetron sputtering of silicon oxide, use manganese / yttrium alloy as the target (the ratio of manganese to yttrium is 95:5), set the DC sputtering power to 60W at 25°C, and the sputtering pressure to 12 sccm and react for 1 min to obtain a catalyst manganese / yttrium thin film with a thickness of 10 nm.

[0058] Step (4) Put the prepared catalyst precursor into a tube furnace, feed in 500 sccm of argon as a prote...

Embodiment 3

[0064] Step (1): Select a silicon wafer polished on one side as a substrate, and clean it with ultrasonic vibration in deionized water, acetone and isopropanone in sequence before use. This is for immediate application without chemical cleaning or surface polishing.

[0065] Step (2): At room temperature, aluminum oxide is used as a target material, the radio frequency power is set to 150 W, the sputtering pressure is 11 sccm and the reaction is performed for 5 minutes to obtain a 25 nm thick aluminum oxide film by sputtering.

[0066] Step (3): After reactive magnetron sputtering alumina, iron / yttrium / lutetium alloy is used as the target (the ratio of iron, yttrium, and lutetium is 95:2:3), and DC sputtering is set at 25°C The power is 80W, the sputtering pressure is 12sccm and the reaction is carried out for 3 minutes to obtain a catalyst iron / yttrium / lutetium thin film with a thickness of 15nm.

[0067] Step (4): Put the prepared catalyst precursor into a tube furnace, fee...

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Abstract

The invention discloses a high-purity winding-free carbon nanotube suspension for a lithium ion battery and a preparation method of the high-purity winding-free carbon nanotube suspension, wherein thepreparation method comprises the following steps: (1) sputtering a carrier film and a metal film on the surface of monocrystalline silicon to prepare a catalyst precursor; (2) putting the catalyst precursor into a tubular furnace, heating to 750-900 DEG C under the protection of inert gas, introducing a carbon source, and growing carbon nanotubes through chemical vapor deposition; and (3) mechanically stripping the carbon nanotubes, and dispersing the carbon nanotubes in a solution through ultrasonic oscillation and ball milling to prepare the stable carbon nanotube suspension. The carbon nanotubes provided by the invention have higher conductivity and purity, and show higher rate capability and cycle performance when being used for the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a method for preparing high-purity non-winding carbon nanotubes for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have become the main energy source for portable electronic devices and electric vehicles, and are the most promising energy storage devices in smart grids using renewable energy. However, low power density is the main disadvantage of Li-ion batteries, especially during high-rate charge and discharge cycles, which may lead to high polarization of electrodes. This shortcoming has seriously hindered the further application of lithium-ion batteries in electric vehicles and other fields. Therefore, many scientists have made great efforts to improve their electrochemical performance, including the possibility of improving their low electrical conductivity by adding carbon-based conductive agents. However, more conductive carbon bla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/162C01B32/168C01B32/174H01M4/62H01M10/0525B01J23/83B01J23/34B01J37/34B01J37/18
CPCC01B32/162C01B32/168C01B32/174H01M4/625H01M10/0525B01J23/83B01J23/34B01J37/342B01J37/18B01J35/0033C01B2202/28C01B2202/30C01B2202/22Y02E60/10
Inventor 钟盛文田丰
Owner 赣州市康达新能源材料有限公司
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