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Carbon-sulphur composite electrode based on carbon nano tube arrays as well as preparation method and application of carbon-sulphur composite electrode

A technology of carbon nanotube arrays and carbon-sulfur compounding, which is applied in electrode manufacturing, battery electrodes, electrode heat treatment, etc., can solve the problems of difficulty in increasing battery energy density, reduction of electrode energy density, loss of active materials, etc., to improve electrochemical performance , small contact resistance, strong adsorption effect

Inactive Publication Date: 2014-12-03
NANJING ZHONGCHU NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional carbon nanotubes are disordered and agglomerated, and the sulfur is mainly loaded through the adsorption on the surface of the carbon nanotubes. The sulfur content in the composite material is low and the distribution is uneven.
When charging and discharging, a large amount of sulfur will directly dissolve into the electrolyte from the surface of carbon nanotubes, resulting in the loss of active materials, and it is difficult to increase the energy density of the battery.
In addition, the addition of inactive material conductive agent and binder in the electrode also greatly reduces the energy density of the electrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Preparation of carbon nanotube array: Using carbon fiber as the substrate, the carbon paper is first ultrasonically cleaned with dilute hydrochloric acid, acetone, alcohol, and deionized water, and dried for later use. Fe(NO) with a concentration of 2mol / L is used. 3 ) 3 The solution and ethyl orthosilicate were used to prepare a sol and evenly coated on the surface of the carbon paper; the coated carbon fiber paper was placed in the chamber of the chemical vapor deposition system, and the temperature was raised to 300°C for 1 hour, and then the temperature was raised to 500°C. Keep it under the condition of introducing hydrogen for 1 hour, and continue to heat up to 900°C while introducing methane and nitrogen. The ratio of hydrogen:methane:nitrogen is 1:4:10. Keep the air pressure at 400 Pa, react for 30 minutes, stop ventilation, and cool down to 100°C to prepare a carbon nanotube array with carbon fiber as the substrate.

[0038] 2) Preparation of carbon-sulfur compo...

Embodiment 2

[0041] Preparation of carbon nanotube array: using stainless steel as the substrate, first polish the stainless steel sheet, ultrasonically in acetone for 15 minutes to remove organic impurities, rinse with deionized water, then soak in 21% nitric acid solution for 10 minutes, and rinse with deionized water. Then it is dehydrated with anhydrous ethanol; on the stainless steel sheet, electron beam evaporation is used to coat the surface with a thickness of about 20nm of silicon as a transition layer, and then a Fe catalyst with a thickness of about 6.5nm is plated, and then placed in a 300°C tube furnace. Hold for 10h; place the treated stainless steel sheet in the chamber of the chemical vapor deposition system, under the protection of argon, heat up to 700℃, keep it for 0.5h under the condition of simultaneously passing hydrogen, and then pass ethylene, hydrogen: ethylene: The ratio of argon gas is 1:5:10, the reaction is 20 minutes, the aeration is stopped, and the temperature...

Embodiment 3

[0044] 1) Preparation of carbon nanotube array: The pretreatment of carbon fiber paper is the same as that in Example 1, using Ni(NO) at a concentration of 1.5mol / L 3 ) 3 Prepare sol with methyl orthosilicate and coat it evenly on the surface of carbon paper; place the coated carbon fiber paper in the chamber of the chemical vapor deposition system, heat up to 300°C, keep it for 1 hour, then heat up to 450°C, pass in Keep the hydrogen for 100 minutes and continue to heat up to 750°C while passing in methane and nitrogen. The ratio of hydrogen:methane:nitrogen is 1:4:10. Keep the air pressure at 400Pa, react for 30 minutes, stop ventilation, cool to 100°C, and take samples.

[0045] 2) Preparation of carbon-sulfur composite electrode based on carbon nanotube array: Heat elemental sulfur to 155℃, put the prepared carbon nanotube array into it under the protection of inert gas, keep it for 15h, and dry it in a 40℃ oven , Keep for 24 hours to form a carbon-sulfur composite electrode ...

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Abstract

The invention discloses a carbon-sulphur composite electrode based on carbon nano tube arrays and a preparation method of the carbon-sulphur composite electrode. The carbon-sulphur composite electrode is formed by compounding the carbon nano tube arrays and a conductive substrate with a sulphur-containing active substance. The preparation method of the carbon-sulphur composite electrode comprises the steps that directionally arranged carbon nano tube arrays are vertically grown on the surface of the conductive substrate and the sulphur-containing active substance is infiltrated into the structure of the carbon nano tube arrays by virtue of heat treatment. The preparation method of the carbon-sulphur composite electrode is simple in operation and low in cost, a conductive agent and a binding agent are not additionally added in the prepared carbon-sulphur composite electrode, the active substance of the carbon-sulphur composite electrode is contacted with an electric conductor in nano scale, contact resistance is low, rate is high, and energy density is high. The invention also discloses a secondary aluminium battery taking the carbon-sulphur composite electrode as a positive electrode.

Description

Technical field [0001] The invention belongs to the field of battery material science, and specifically relates to a carbon-sulfur composite electrode based on a carbon nanotube array, a preparation method and a secondary aluminum battery using the composite electrode. Background technique [0002] With the rapid development of new power sources such as electronic and communication equipment, electric vehicles, wind power generation and photovoltaic power generation, human beings have higher and higher battery performance requirements for supporting power sources, and there is an urgent need to develop power batteries and energy storage batteries. Secondary aluminum-sulfur batteries are one of the ideal battery systems that meet these requirements. [0003] The theoretical volumetric capacity of aluminum is 8050mAh / cm 3 , Is 4 times that of lithium, and has stable chemical activity, making it an ideal anode material; the theoretical volumetric capacity of sulfur is 3467mAh / cm 3 , I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/136H01M4/1397H01M10/054
CPCH01M4/0471H01M4/13H01M4/139H01M4/625H01M10/054Y02E60/10
Inventor 赵宇光钟毓娟
Owner NANJING ZHONGCHU NEW ENERGY
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