Active carbon material with spherical structure and preparation method and applications thereof

A kind of activated carbon and spherical technology, which is applied in the field of activated carbon materials and its preparation, can solve the problems of uneven discharge capacity and cycle efficiency of lithium-sulfur batteries, difficulty in ensuring the high quality of lithium-sulfur batteries, and no activated carbon materials have been found yet. Effects of chemical properties, good application prospects, excellent morphology and performance

Active Publication Date: 2018-03-16
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] After searching the existing technology, the discharge capacity and cycle efficiency of lithium-sulfur batteries prepared by using carbon materials are uneven, and it is difficult to ensure the high quality of lithium-sulfur batteries. many
The prepared activated carb

Method used

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  • Active carbon material with spherical structure and preparation method and applications thereof
  • Active carbon material with spherical structure and preparation method and applications thereof
  • Active carbon material with spherical structure and preparation method and applications thereof

Examples

Experimental program
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preparation example Construction

[0038] There is the preparation method of the activated carbon material of spherical structure, comprises the steps:

[0039] S1. Ultrasonic dispersion: Mix carbohydrates and carbon materials in a deionized aqueous solution at room temperature for 3 to 24 hours, then use an electromagnetic ultrasonic device for ultrasonic dispersion. The power of ultrasonic dispersion is 200 to 750W; the time of ultrasonic dispersion is 0.5 ~10h, to obtain a mixed solution;

[0040] S2. Spray pyrolysis treatment: the mixed solution described in step S1 is placed in a two-necked flask, and after being atomized by an ultrasonic nebulizer, the atomized mixed solution is passed into a vacuum tube furnace with an inert gas in advance to carry out Constant temperature treatment, pre-heating to 350-450°C, after 24 hours; constant temperature until the end of spraying and then continuing for 2 hours, after the reaction furnace is cooled to room temperature, collect the deposited product in the tube; ...

Embodiment 1

[0044] (1) Preparation method of activated carbon material with spherical structure

[0045] There is the preparation method of the activated carbon material of spherical structure, comprises the steps:

[0046] S1. Ultrasonic dispersion: Mix sucrose and graphite in a mass ratio of 4:1 and place them in a deionized aqueous solution, wherein the mass ratio of the total mass of sugars and carbon materials to deionized water is 1:40. At room temperature, use Electromagnetic stirrer, after mixing and stirring for 3 hours, use an electromagnetic ultrasonic device to perform ultrasonic dispersion at a power of 200W; the time of ultrasonic dispersion is 1 hour to obtain a mixed solution;

[0047] S2. Spray pyrolysis treatment: the mixed solution in step S1 is placed in a double-necked flask fixed on an ultrasonic spray device, atomized by an ultrasonic sprayer with a flow rate of 200-300cc / min, and the atomized mixed solution is passed through the pre- In the electromagnetic vacuum ...

Embodiment 2

[0053] (1) Preparation method of activated carbon material with spherical structure

[0054] There is the preparation method of the activated carbon material of spherical structure, comprises the steps:

[0055] S1. Ultrasonic dispersion: Mix sucrose and carbon nanotubes at a mass ratio of 5:1 and place them in a deionized aqueous solution, use an electromagnetic stirrer at room temperature, mix and stir for 6 hours, and use an electromagnetic ultrasonic device at a power of 750W to carry out Ultrasonic dispersion; the time of ultrasonic dispersion is 0.5h, and a mixed solution is obtained;

[0056] S2. Spray pyrolysis treatment: the mixed solution in step S1 is placed in a two-necked flask fixed on an ultrasonic spray device, atomized by an ultrasonic sprayer with a flow rate of 200-300cc / min, and the atomized mixed solution is passed through a pre-pass In an electromagnetic vacuum tube furnace with argon gas, heat up to 400°C at a heating rate of 5°C / min for constant temper...

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Abstract

The invention discloses an active carbon material with a spherical structure. The active carbon material is prepared by subjecting saccharides and a carbon material to ultrasonic dispersion, spray pyrolysis, and carbonization, wherein the mass ratio of saccharides to the carbon material is 1-5:1. Through an ultrasonic spray pyrolysis method, the active carbon material is prepared and is taken as an active substance carrier for the cathode material of a lithium sulfur battery. The prepared active carbon material has a spherical structure, which is formed by the self-supporting effect of the carbon material; cavities exist in the spheres, the specific surface area is large, the dispersibility is good, and the electrochemical properties of the cathode material are improved effectively. Moreover, the operation of the preparation method is simple, the cost is low, and the preparation method is energy saving and environmentally friendly. The pore structure of the prepared active carbon material is abundant. The active carbon material is taken as an active substance carrier for a lithium sulfur battery, which has the advantages of high electrochemical specific capacity, excellent cycle performance, stable structure, and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to an activated carbon material with a spherical structure and its preparation method and application. Background technique [0002] With the increasing demand for energy consumption in the world, the oil resources that can be developed and utilized are increasingly depleted, while the environmental pollution is becoming more and more serious. Therefore, the use of electrochemical energy storage technology to store and reuse clean solar energy and wind energy is undoubtedly the solution to this problem in the 21st century. In addition, mobile electronic devices and electric vehicles that affect people's lives also put forward higher requirements for future electrochemical energy storage technology. All of these require safe, low-cost, high-energy-density and long-life secondary batteries to be realized. Among many energy storage methods, lithium-ion batteries occupy a ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 向楷雄陈晗文晓雨胡伟达陈宪宏
Owner HUNAN UNIV OF TECH
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