Lithium-sulfur battery composite cathode material, preparation method thereof and application of lithium-sulfur battery
A composite positive electrode material and lithium-sulfur battery technology, which is applied in the field of electrochemical energy, can solve the problems of poor cycle performance, low capacity, and high production cost, and achieve high rate performance, high lithium ion conductivity, and stable product quality.
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[0049] Example 1
[0050] Put 1.2 g of washed lotus leaf stems, 1.2 g of nickel acetate and 5 g of potassium hydroxide into a mixed solution of 100 mL of deionized water and 10 mL of alcohol and stir evenly at 500 r / min. Then put it in a vacuum drying box to dry at 60 °C for 5 hours, and finally put it in a tube furnace. In an argon atmosphere, the temperature is raised to 850 °C at a rate of 5 °C / min for 4 hours. After the reaction is completed, the temperature is lowered to room temperature. The solution and deionized water were repeatedly washed until neutral, and the nickel-doped conductive graphitized carbon material was obtained after freeze-drying at -120 °C for 24 h.
[0051] 0.2g of nickel-doped conductive graphitized carbon material was put into CS dissolved with 0.8g of elemental sulfur 2 After the organic solution is stirred and mixed, use a syringe to drop the mixed solution into a 2025 battery case or put it into a porcelain boat, heat at 50 °C to evaporate all ...
Example Embodiment
[0054] Example 2
[0055] Put 1.2g of washed lotus leaf stalks, 1.74g of nickel nitrate, 0.06g of urea, and 3.58g of potassium hydroxide into a mixed solution of 100mL of deionized water and 10mL of alcohol, and stir evenly at 500r / min. Then put it into a vacuum drying box to dry at 60 °C for 5 hours, and finally put it in a tube furnace. In an argon atmosphere, the temperature is raised to 500 °C at a rate of 1 °C / min for 1 hour. After the reaction is completed, the temperature is lowered to room temperature. The solution and deionized water were repeatedly washed until neutral, and then freeze-dried at -120 °C for 24 h to obtain a nickel-nitrogen co-doped conductive graphitized carbon material.
[0056] 0.18g of nickel-nitrogen co-doped conductive graphitized carbon material and 0.02g of PEO (with a molecular weight of 4,000,000) were placed in CS dissolved with 0.8g of elemental sulfur 2 After the organic solution is stirred and mixed, use a syringe to drop the mixed solut...
Example Embodiment
[0059] Example 3
[0060] Put 1.2 g of washed cotton stalks, 18.3 g of cobalt acetate, 4.2 g of sodium fluoride, and 16.8 g of sodium hydroxide into a mixed solution of 200 mL of deionized water and 50 mL of alcohol and stir evenly at 1000 r / min. Then put it into a vacuum drying box to dry at 60°C for 5 hours, and finally put it in a tube furnace, and heat it up to 1000°C at a rate of 10°C / min under an argon atmosphere for 12 hours. After the reaction is completed, it is cooled to room temperature. The solution and deionized water were repeatedly washed to neutrality, and the cobalt-fluorine co-doped conductive graphitized carbon material was obtained after freeze-drying at -120 °C for 36 h. figure 1 As shown in the XRD pattern, the carbon material without the addition of the metal precursor is amorphous carbon.
[0061] 0.4g cobalt-fluorine co-doped conductive graphitized carbon material and 0.2g PEO (molecular weight 2000) were put into CS dissolved with 0.4g elemental sulf...
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