Method for preparing lithium-sulfur battery positive electrode material from three-dimensional mesoporous biochar
A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, active material electrodes, etc., can solve the problems of storing sulfur substances, unable to provide large pore volume, etc., to improve electrical conductivity, good electrochemical advantages, The effect of avoiding harm
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[0021] Embodiment 1: A method for preparing a lithium-sulfur battery cathode material made of three-dimensional mesoporous bio-carbon, the specific steps are as follows:
[0022] Step 1: Add 25 grams of glucose, 7.5 grams of yeast powder, 10 grams of peptone, and 10 grams of disodium hydrogen phosphate into a large beaker containing ultrapure water. Stir the solution until it is clear and then add glacial acetic acid to pH=4- 5. Obtain bacterial growth liquid;
[0023] Step 2: Pour the bacterial growth solution into an Erlenmeyer flask, sterilize it in a high-temperature sterilization box at 155°C for 30 minutes, cool the sterilized growth solution to room temperature in air, and then transfer the Acetobacter xylinum strains. Incubate in an incubator at 30°C for 7 days to make a light yellow BC liquid gel;
[0024] Step 3: Soak the light yellow BC liquid gel in deionized water at 80°C for 5 hours, and then purify it in a 0.5 mol / L NaOH solution until the color becomes milky white. ...
Example Embodiment
[0032] Example 2: Preparation of three-dimensional mesoporous biochar to produce S@CoS 2 / N-CNFs (40%) lithium-sulfur battery cathode material method, in Example 2, except that Step 4 is different from that in Example 1, other steps are the same. In step four, add 0.2 grams of CoCl 2 ·6H 2 O, 0.4 g Na 2 S 2 O 3 ·5H 2 O and 0.067 g of melamine were dissolved in 30 mL of deionized water containing 0.1 g of bacterial cellulose aerogel, and subjected to hydrothermal synthesis at 130°C for 12 hours to obtain 50% CoS 2 The nitrogen doping amount is 40% hydrothermal product, denoted as CoS 2 / 40% N-BC to prepare the cathode material S@CoS for lithium-sulfur batteries 2 / N-CNFs (40%), and prepared a coin cell corresponding to the cathode material.
[0033] Figure 4 with Figure 5 Respectively the CoS prepared in Example 2 2 / N-CNFs (40%) X-ray diffraction pattern and scanning electron microscope topography, Figure 4 Shows that 40% N doping in Example 2 did not affect CoS 2 Generated from...
Example Embodiment
[0034] Example 3: Preparation of three-dimensional mesoporous biochar to produce S@CoS 2 / N-CNFs (60%) lithium-sulfur battery cathode material method, in Example 3, except that Step 4 is different from that in Example 1, other steps are the same. In step four, add 0.2 grams of CoCl 2 ·6H 2 O, 0.4 g Na 2 S 2 O 3 ·5H 2 O and 0.15 g of melamine were dissolved in 30 ml of deionized water containing 0.1 g of bacterial cellulose aerogel and hydrothermally synthesized at 130°C for 12 hours to obtain 50% CoS 2 The amount of nitrogen doped under is 60% hydrothermal product, denoted as CoS 2 / 60% N-BC to prepare the cathode material S@CoS for lithium-sulfur batteries 2 / N-CNFs (60%), and prepare a button battery corresponding to the cathode material.
[0035] Figure 7 with Figure 8 Respectively the CoS prepared in Example 3 2 / N-CNFs (60%) X-ray diffraction pattern and scanning electron microscope topography, Figure 7 It shows that the 60% N doping in Example 3 does not affect CoS 2 Gener...
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