A battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, lithium-sulfur battery and preparation method thereof
A technology of bacterial cellulose and bacterial cellulose membrane, which is applied in the battery positive electrode based on N-doped carbonized bacterial cellulose, lithium-sulfur battery and its preparation, to achieve the effects of controlling the shuttle effect, increasing the load capacity, and high specific capacity
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Embodiment 1
[0027] A method for preparing a positive electrode of a battery based on N-doped carbonized bacterial cellulose, the specific steps are as follows:
[0028] In step 1, the BC membrane with a thickness of 3.0 mm was taken out of the culture medium, and the excess fermentation liquid on the surface of the membrane was washed with deionized water, and then freeze-dried to obtain BC aerogels containing N source.
[0029] Step 2: Flatten the BC airgel containing N source (0.2Mpa positive pressure), and then keep it warm at 800°C for 2h under the protection of an inert atmosphere to obtain NCBC airgel.
[0030] Step 3, infiltrating NCBC airgel into S / CS 2 In the solution, let it stand at room temperature for 2 hours, take it out, put it in a closed container, and keep it at a temperature of 130°C for 6 hours, so that the elemental S is in a molten state and diffuses evenly into the inside of the NCBC mesh, and the S / NCBC positive electrode is obtained after cooling , the S content ...
Embodiment 2
[0037] A method for preparing a positive electrode of a battery based on N-doped carbonized bacterial cellulose, the specific steps are as follows:
[0038] In step 1, the BC membrane with a thickness of 2.0 mm was taken out from the culture medium, and the excess fermentation liquid on the surface of the membrane was washed with deionized water, and then freeze-dried to obtain BC aerogels containing N source.
[0039] Step 2: Flatten the BC airgel containing N source (0.2Mpa positive pressure), and then keep it at 900°C for 1 hour under the protection of an inert atmosphere to obtain NCBC airgel.
[0040] Step 3, infiltrating NCBC airgel into S / CS 2 In the solution, let it stand at room temperature for 4 hours, take it out, put it in a closed container, and keep it at 200°C for 10 hours, so that the elemental S is in a molten state and diffuses evenly into the inside of the NCBC mesh, and the S / NCBC positive electrode is obtained after cooling , the S content of the prepared...
Embodiment 3
[0047] A method for preparing a positive electrode of a battery based on N-doped carbonized bacterial cellulose, the specific steps are as follows:
[0048] In step 1, the BC membrane with a thickness of 2.0 mm was taken out from the culture medium, and the excess fermentation liquid on the surface of the membrane was washed with deionized water, and then freeze-dried to obtain BC aerogels containing N source.
[0049] Step 2: Flatten the BC airgel containing N source (0.2Mpa positive pressure), and then keep it at 1000°C for 1 hour under the protection of an inert atmosphere to obtain NCBC airgel.
[0050] Step 3, infiltrating NCBC airgel into S / CS 2 In the solution, let it stand at room temperature for 6 hours, take it out, put it in a closed container, and keep it at a temperature of 160 ° C for 12 hours, so that the elemental S is in a molten state and diffuses evenly into the inside of the NCBC mesh, and the S / NCBC positive electrode is obtained after cooling , the S con...
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