A method for preparing a lithium-sulfur battery positive electrode material

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low battery capacity retention, battery capacity reduction, complex synthesis process, etc., to achieve good cycle stability, The effect of increased discharge capacity and simple synthesis method

Inactive Publication Date: 2018-05-15
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the poor conductivity of sulfur, the cathode material of lithium-sulfur batteries, seriously affects the electrochemical performance of the battery, resulting in a decrease in battery capacity, while the existence of the shuttle effect leads to low battery capacity retention, poor cycle perform

Method used

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  • A method for preparing a lithium-sulfur battery positive electrode material

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preparation example Construction

[0021] The preparation method of a kind of lithium-sulfur battery cathode material of the present invention comprises the following steps:

[0022] Step 1, sequentially add resorcinol, furfural and urotropine to the solvent for mixing, and stir for 1-3 hours;

[0023] Solvent described in step 1 is a kind of in methanol, ethanol or Virahol;

[0024] In step 1, every 100ml of solvent contains 9g-15g of resorcinol, 14ml-24ml of furfural and 0.25-1.5g of urotropine;

[0025] Step 2, sealing and heat-treating the solution obtained in step 1 at 80°C-120°C for 3 days-7 days to obtain a gel;

[0026] Step 3: heat-treat the gel obtained in step 2 at 60°C-100°C for 1 hour-5 hours, and let it stand at 25°C-50°C for 24 hours-48 hours to obtain a dry gel;

[0027] Step 4, pulverizing the xerogel obtained in step 3, and heat-treating the obtained powder under nitrogen gas at 900°C-1200°C for 2 hours-6 hours to obtain nitrogen-doped carbon airgel;

[0028] Step 5, sequentially adding hyd...

Embodiment 1

[0036] Step 1, add resorcinol, furfural and urotropine in turn to methanol and mix, stir for 1 hour, wherein every 100ml of methanol contains 9g of resorcinol, 14ml of furfural and 0.25g of urotropine Taste;

[0037] Step 2, sealing and heat-treating the solution obtained in Step 1 at 80°C for 7 days;

[0038] Step 3, heat-treating the gel obtained in step 2 at 60°C for 5 hours, and standing at 25°C for 48 hours;

[0039] Step 4, pulverizing the xerogel obtained in step 3, and heat-treating the obtained powder at 900° C. for 6 hours under nitrogen;

[0040] Step 5, sequentially add hydrochloric acid with a mass fraction of 37%, sodium thiosulfate pentahydrate, polyethylene glycol-200, and the carbon airgel obtained in step 4 to distilled water, and stir for 24 hours, wherein each 100ml of distilled water contains The mass fraction of 1.98g is 37% hydrochloric acid, 2.41g sodium thiosulfate pentahydrate, 0.2g carbon aerogel, 1ml polyethylene glycol-200;

[0041] Step 6: Soni...

Embodiment 2

[0045] Step 1, add resorcinol, furfural and urotropine to ethanol in turn and mix, stir for 3 hours, wherein every 100ml of ethanol contains 15g of resorcinol, 24ml of furfural and 1.5g of urotropine Taste;

[0046] Step 2, sealing and heat-treating the solution obtained in Step 1 at 120° C. for 3 days;

[0047] Step 3, heat-treating the gel obtained in step 2 at 100°C for 1 hour, and standing at 50°C for 24 hours;

[0048] Step 4, pulverizing the xerogel obtained in step 3, and heat-treating the obtained powder under nitrogen at 1200° C. for one hour;

[0049] Step 5, sequentially add hydrochloric acid with a mass fraction of 37%, sodium thiosulfate pentahydrate, polyethylene glycol-400, and the carbon airgel obtained in step 4 to distilled water, and stir for 48 hours, wherein each 100ml of distilled water contains The mass fraction of 11.83g is 37% hydrochloric acid, 14.47g sodium thiosulfate pentahydrate, 0.2g carbon aerogel, 5ml polyethylene glycol-400;

[0050] Step 6...

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Abstract

A method for preparing a lithium-sulfur battery positive electrode material is disclosed. The method includes 1) adding resorcinol, furfural and hexamethylenetetramine in order into a solvent and mixing the mixture; 2) subjecting the solution obtained in the step 1) to sealed thermal treatment to obtain gel; 3) subjecting the obtained gel to thermal treatment to obtain xerogel; 4) crushing the xerogel obtained in the step 3), feeding nitrogen, and performing thermal treatment to obtain nitrogen doped carbon aerogel; 5) adding hydrochloric acid, sodium thiosulfate pentahydrate, a dispersing agent and the carbon aerogel obtained in the step 4) into distilled water in order and stirring the mixture; 6) subjecting the suspension obtained in the step 5) to ultrasonic treatment for 20 min; 7) subjecting the solution obtained in the step 6) to suction filtration to obtain black powder; and 8) subjecting the black powder obtained in the step 7) to thermal treatment at 155 DEG C for 24 h to obtain the nitrogen doped carbon aerogel adsorbed material as the lithium-sulfur battery positive electrode material. The method is simple, high in cost performance ratio, good in reproducibility and suitable for commercial production.

Description

technical field [0001] The invention relates to the technical field of preparation methods of battery cathode materials, in particular to a preparation method of lithium-sulfur battery cathode materials. Background technique [0002] Lithium-sulfur battery is considered as a new type of energy storage device due to its high cost performance, high specific energy density, and environmental friendliness. It is used in mobile equipment, large electrical equipment, aerospace and electric / hybrid vehicles, etc. in the field. This secondary lithium-sulfur battery uses sulfur as the positive electrode and metal lithium as the negative electrode, and provides energy through the chemical reaction between lithium and sulfur. When sulfur and lithium completely react, its theoretical specific energy is as high as 1680mAh / g, which is 3 to 5 times that of traditional lithium batteries, and can fully meet the needs of high-capacity fast-charging power devices. However, the poor conductivi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M10/052
CPCH01M4/362H01M4/587H01M10/052Y02E60/10
Inventor 李峰于海洋
Owner XIAN UNIV OF TECH
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