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Iron and nickel-doped activated carbon-sulfur material and preparation method and application thereof

A technology of activated carbon and sulfur cathode material, applied in electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of difficult control of the reaction process, high cost of metal alkoxides, low specific capacity, etc., and improve the electrochemical cycle performance. , The effect of inhibiting negative electrode corrosion and high production efficiency

Inactive Publication Date: 2018-01-16
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The material has the following problems: (1) the sulfur load of the positive electrode material is low; (2): and when the sulfur load is greater than 50%, the specific capacity is very low
The disadvantages of this material are (1): the cost of metal alkoxide in the sol-gel method is relatively high; (2): the self-propagating high-temperature synthesis method has the disadvantages that the reaction process is not easy to control, etc.

Method used

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  • Iron and nickel-doped activated carbon-sulfur material and preparation method and application thereof
  • Iron and nickel-doped activated carbon-sulfur material and preparation method and application thereof
  • Iron and nickel-doped activated carbon-sulfur material and preparation method and application thereof

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Embodiment

[0027] A preparation method of iron, nickel doped activated carbon-sulfur cathode material, comprising the steps of:

[0028] Step 1) Prepare iron and nickel doped activated carbon powder by hydrothermal method, and measure 8 mL 0.1 mol L respectively -1 Ni(NO 3 ) 2 , Fe(NO 3 ) 3 Solution and weigh 0.2 g of activated carbon into a beaker, then add 50 mL of N, N-dimethylformamide (DMF), ultrasonically disperse for 30 minutes to obtain a uniformly mixed solution, transfer it to a stainless steel reaction kettle, and heat at 160 °C Under the conditions, react for 20 h, cool to room temperature, wash with distilled water and organic solvent, and then dry to obtain iron and nickel doped activated carbon powder;

[0029] Step 2) The unactivated iron and nickel doped activated carbon-sulfur material was prepared by liquid phase in situ compounding method. 0.6 g of sublimed sulfur was dissolved in 200 mL of sodium sulfide aqueous solution, stirred thoroughly and ultrasonicated to...

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Abstract

The invention discloses an iron and nickel-doped activated carbon-sulfur material. The iron and nickel-doped activated carbon-sulfur material is obtained by activating an inorganic nickel salt, an inorganic iron salt, activated carbon and sulfur as raw materials through a hydrothermal method, a liquid-phase in-situ composite method and a melting method. The preparation method comprises the following steps of (1) preparing iron and nickel-doped activated carbon powder through the hydrothermal method; (2) preparing an unactivated iron and nickel-doped activated carbon-sulfur material through theliquid-phase in-situ composite method; and (3) activating the iron and nickel-doped activated carbon-sulfur material. The iron and nickel-doped activated carbon-sulfur material is used as a positiveelectrode of a lithium-sulfur battery; when the current density is 167.5mA / cm<2>, the initial specific discharge capacity is 1,000-1100mAh / g; and after 100 cycles, the specific capacity is reduced to500-550mAh / g. The iron and nickel-doped activated carbon-sulfur material has the advantages that (1) the sulfur content is greatly improved; (2) dissolution of one part of polysulfide is successfullyinhibited; and (3) component distribution is uniform, negative electrode corrosion and internal resistance increase of the battery caused by the shuttle effect are effectively inhibited, and the effects of providing the specific discharge capacity, reducing the battery capacity attenuation rate and improving the cycle performance are achieved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an iron-nickel doped activated carbon-sulfur material and a preparation method and application thereof. Background technique [0002] With the development of society, human's demand for energy is gradually increasing. However, with the continuous and accelerated exploitation of fossil fuel resources such as coal, oil, and natural gas for nearly 200 years, the resources have gradually become exhausted. Therefore, energy issues and environmental issues have become global concerns and urgently need to be resolved. The development of secondary batteries with high energy, high density, high safety, green environmental protection and low cost is of great significance in the field of new energy. Lithium-sulfur battery is a kind of secondary battery system with higher energy density. It uses elemental sulfur or sulfur-containing materials as the positive electrode active ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 孙立贤程日光徐芬周密吴廷焕张晨晨陆常建
Owner GUILIN UNIV OF ELECTRONIC TECH
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