Preparation method of positive material for cobalt nitride/porous carbon plate/carbon cloth self-supported lithium-sulfur battery

A lithium-sulfur battery and cathode material technology, applied in the manufacture of battery electrodes, lithium batteries, electrolyte batteries, etc., to achieve the effects of dissolution and shuttling inhibition, wide application prospects, and developed pore structure

Active Publication Date: 2018-11-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to effectively prepare such a self-supporting positive electrode with strong cycle stability, efficient i

Method used

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  • Preparation method of positive material for cobalt nitride/porous carbon plate/carbon cloth self-supported lithium-sulfur battery
  • Preparation method of positive material for cobalt nitride/porous carbon plate/carbon cloth self-supported lithium-sulfur battery
  • Preparation method of positive material for cobalt nitride/porous carbon plate/carbon cloth self-supported lithium-sulfur battery

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Embodiment 1

[0029] (1) First, clean the carbon cloth with deionized water, ultrasonically clean it with acetone and ethanol, then put it in a 60°C oven for drying, oxidize it in concentrated nitric acid at 90°C for 6 hours, and wash it with deionized water until pH=7, 60 Drying at ℃; obtain carbon with cobalt-based metal-organic framework growing on the surface; figure 1 are digital photographs and scanning electron microscope (SEM) photographs of the material;

[0030] (2) Dissolve cobalt nitrate hexahydrate and 2-methylimidazole in water respectively, and make the molar ratio of cobalt nitrate and 2-methylimidazole 1:4, the concentration of 2-methylimidazole is 0.4M, and (1 ) was added to the oxidized carbon cloth obtained in cobalt nitrate aqueous solution, and then the above-mentioned 2-methylimidazole solution was added, shaken for 3 minutes, and then left to react for 4 hours. After the reaction, the carbon cloth was alternately rinsed with deionized water and ethanol, and dried at...

Embodiment 2

[0038] (1) First, clean the carbon cloth with deionized water, ultrasonic cleaning with acetone and ethanol, and then dry it in a 60°C oven. Put the dried carbon cloth in concentrated sulfuric acid, oxidize it at 60°C for 3 hours, and deionize it. Wash with water to pH=7, dry at 60°C;

[0039] (2) Prepare methanol solutions of cobalt nitrate hexahydrate and terephthalic acid respectively, so that the molar ratio of cobalt nitrate and terephthalic acid is 1:10, and the concentration of terephthalic acid is 0.5M. Add the oxidized carbon cloth to the cobalt nitrate solution, then add the prepared terephthalic acid solution, shake it for 3 minutes and let it stand for 12 hours to react; wash the carbon cloth alternately with deionized water and ethanol, and dry it in an oven at 60°C to obtain a surface Carbon cloth for growing cobalt-based metal-organic framework materials;

[0040] (3) Heat the material obtained in (2) to 500°C in a nitrogen atmosphere at a heating rate of 4°C / m...

Embodiment 3

[0044] (1) First, clean the carbon cloth with deionized water, ultrasonic cleaning with acetone and ethanol, and then dry it in a 60°C oven; put the dried carbon cloth in nitrous acid, and oxidize it at 120°C for 3 hours; deionized water Wash until pH = 7, and dry in an oven at 60°C;

[0045] (2) Prepare ethanol solutions of cobalt nitrate hexahydrate and 2-methylimidazole respectively, and make the molar ratio of cobalt nitrate and 2-methylimidazole 1:7, and the concentration of 2-methylimidazole is 0.1M, and (1 ) was added to the cobalt nitrate solution, and then the prepared 2-methylimidazole solution was added, shaken for 3 minutes and left to react for 24 hours; after the reaction, the carbon cloth was washed alternately with deionized water and ethanol, Dry in an oven at 60°C;

[0046] (3) Heat the material obtained in (2) to 600°C in a nitrogen atmosphere at a heating rate of 2°C / min and keep it warm for 4 hours; then oxidize the material at 300°C in an air atmosphere ...

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Abstract

The invention discloses a preparation method of positive material for cobalt nitride/porous carbon plate/carbon cloth self-supported lithium-sulfur battery, belongs to the field of electrochemical energy storage of new energy material. The preparation method comprises the following steps: using a metal organic skeleton compound as a precursor, carbon cloth as a carrier, a metal organic skeleton compound vertically and uniformly grow on the flexible carbon cloth, performing treatment such as carbonization and nitridation to obtain cobalt nitride particles embedded nano carbon plate. The porousnano carbon plate is loaded on the fiber surface of the carbon cloth in a vertical growth manner and shows good electrochemical performance as the positive material of the lithium-sulfur battery. Thecompound self-supported lithium-sulfur battery positive material disclosed by the invention has developed pore structure, greatly shortens the diffusion distance of substances such as ions, electronsand electrolyte; the cobalt nitride particles with nano size adsorbs and catalytically converts the polysulfide, so the dissolution and shuttling of the polysulfide are effectively inhabited, the electric conductivity of the material is greatly improved by the carbon cloth and the application prospect is wide.

Description

technical field [0001] The invention relates to a method for preparing a cobalt nitride / porous carbon sheet / carbon cloth self-supporting lithium-sulfur battery cathode material, belonging to the field of electrochemical energy storage of new energy materials. Background technique [0002] With the popularity of portable electronic products and the rapid development of electric vehicles, the requirements for energy storage technology are getting higher and higher. The energy density and power density of traditional lithium-ion batteries are difficult to meet the energy storage requirements of new devices and equipment. The new battery lithium-sulfur battery has a high specific capacity (1675 mAh / g) and high energy density (2675Wh / kg), and the cathode active material sulfur is very abundant, cheap and environmentally friendly. Therefore, compared with lithium-ion batteries, lithium-sulfur batteries have great development potential and application prospects. [0003] Carbon-b...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/139H01M10/058H01M10/052
CPCH01M4/139H01M4/362H01M4/38H01M4/62H01M4/625H01M4/628H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 赵宗彬张涵张治超王旭珍邱介山
Owner DALIAN UNIV OF TECH
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