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Method for increasing sulfur content of sulfur-carbon composite through vulcanization accelerator

A technology of vulcanization accelerator and sulfur-carbon compound, which is applied in the field of electrochemical power supply, can solve the problem that it is difficult to efficiently increase the sulfur content of the sulfur-carbon compound, and achieves the effects of lowering temperature, simple equipment and increasing sulfur content

Inactive Publication Date: 2016-06-01
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to efficiently increase the sulfur content of sulfur-carbon composites by simply changing the reaction conditions.

Method used

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  • Method for increasing sulfur content of sulfur-carbon composite through vulcanization accelerator
  • Method for increasing sulfur content of sulfur-carbon composite through vulcanization accelerator
  • Method for increasing sulfur content of sulfur-carbon composite through vulcanization accelerator

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Mix polyacrylonitrile, elemental sulfur, and 2-mercaptobenzothiazole in a mass ratio of 1:1:0.1, and put them into a ball mill tank for ball milling at a speed of 400 rpm for 3 hours to obtain Mix the reaction mixture homogeneously;

[0037] (2) Put the reaction mixture into an airtight container, place it in a vacuum tube furnace, pass in argon gas, raise the temperature to 185°C, keep it warm for 1 hour, then continue to raise the temperature to 280°C, and keep it warm for 6 hours. The heating rate is 10°C / hour. After the reaction was completed, it was naturally cooled to room temperature.

Embodiment 2

[0045] (1) Mix polyacrylonitrile, elemental sulfur, and 2-mercaptobenzothiazole in a mass ratio of 1:3:0.1, and put them into a ball mill tank for ball milling at a speed of 400 rpm for 3 hours to obtain Mix the reaction mixture homogeneously;

[0046] (2) Put the reaction mixture into an airtight container, place it in a vacuum tube furnace, pass in argon gas, raise the temperature to 185°C, keep it warm for 1 hour, then continue to raise the temperature to 320°C, and keep it warm for 6 hours. The heating rate is 10°C / hour. After the reaction was completed, it was naturally cooled to room temperature.

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Abstract

The invention discloses a method for increasing a sulfur content of a sulfur-carbon composite through a vulcanization accelerator. The method comprises the steps of enabling a carbon source, a sulfur source and the vulcanization accelerator to be mixed and ball milled to obtain a uniform mixture; and putting the uniform mixture into a sealed container, and pumping protective gas to enable the mixture to be fully reacted at a vulcanizing temperature of 100-700 DEG C to obtain the sulfur-carbon composite. The method provided by the invention is simple and effective, and capable of greatly increasing the sulfur content of the sulfur-carbon composite; therefore, the electrochemical performance of a lithium-sulfur battery taking the sulfur-carbon composite as the positive electrode material can be improved; for example, the discharge capacity and the cycling stability of the battery can be dramatically improved while other impurities affecting the operation of the battery are not introduced either.

Description

technical field [0001] The invention specifically relates to a preparation method of a sulfur-carbon compound that can be applied to a lithium-sulfur battery, and belongs to the field of electrochemical power sources. Background technique [0002] With the increasing shortage of traditional resources and energy and the increasingly serious environmental problems, the development of new energy storage and conversion technologies has become the focus of energy strategies of various countries. Among them, lithium-sulfur batteries are high-energy-density secondary batteries with great development potential and application prospects. It uses sulfur as the main positive electrode active material, has high specific capacity (1675mAh / g) and high energy density (2600Wh / kg), and sulfur is cheap and non-toxic, so lithium-sulfur batteries are attracting increasing attention. [0003] Lithium-sulfur batteries face difficulties such as the insulation of the active material sulfur and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 陈宏伟王长虹陈立桅
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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