Open cage-like hierarchical-pore carbon-based positive electrode material of lithium-sulfur battery and preparation method thereof
A technology for lithium-sulfur batteries and cathode materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems affecting the specific capacity and stability of batteries, destroying the structural stability of cathode materials, and reducing the cycle stability of batteries, etc. , to achieve the effects of shortening the electron transport path, high repetition rate, and simple preparation method
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Embodiment 1
[0042] An open cage-like hierarchical porous carbon as a high-performance lithium-sulfur battery positive electrode material, comprising the following steps:
[0043] 1) Weigh 3g of dopamine hydrochloride and add it to a 20ml beaker, add 50mL of deionized water, stir and dissolve, add 7.5g of silica sol (40wt%), 3g of dilute sulfuric acid (10wt%), and add 0.15g of dopamine Sodium alkyl sulfate (SDS), after stirring and dissolving, ultrasonically disperse for 30 minutes to fully mix the silica sol and dopamine solution;
[0044] 2) Transfer the beaker containing the mixed raw materials in step 1) to an oven at 60°C, and dry the water to obtain a solid mixture;
[0045] 3) Collect and transfer the solid mixture to a crucible, place in a tube furnace, carbonize for 5 hours under an argon atmosphere at 700°C, and heat up at a rate of 3°C / min to obtain a black solid; then add 20wt% HF solution and stir After 12 hours, remove the silicon dioxide, filter through an organic filter memb...
Embodiment 2
[0051] An open cage-like hierarchical porous carbon as a high-performance lithium-sulfur battery positive electrode material, comprising the following steps:
[0052] 1) Weigh 4g of dopamine hydrochloride, 7.5g of silica sol, 5g of dilute sulfuric acid (10wt%), and 0.08g of sodium dodecyl sulfate (SDS) into a beaker with 80mL of deionized water. After dissolving, ultrasonically Disperse for 60 minutes;
[0053] 2) Transfer the beaker containing the mixed raw materials in step 1) to an oven at 60°C, and dry the water to obtain a solid mixture;
[0054] 3) Collect and transfer the solid mixture to a crucible, place in a tube furnace, carbonize for 4 hours under an argon atmosphere at 900°C, and heat up at a rate of 5°C / min to obtain a black solid; then add 20wt% HF solution and stir After 24 hours, remove the silicon dioxide, filter through an organic membrane with a pore size of 0.22 μm, and dry to obtain a black solid powder, which is an open cage-like hierarchical porous car...
Embodiment 3
[0062] An open cage-like hierarchical porous carbon as a high-performance lithium-sulfur battery positive electrode material, comprising the following steps:
[0063] 1) Weigh 3.6g of dopamine hydrochloride, 7.5g of silica sol, 4g of dilute sulfuric acid (10wt%), and 0.12g of sodium dodecyl sulfate (SDS) into a 100mL beaker. After dissolving, ultrasonically disperse for 60min ;
[0064] 2) Transfer the beaker containing the mixed raw materials in step 1) to an oven at 60°C, and dry the water to obtain a solid mixture;
[0065] 3) Collect and transfer the solid mixture to a crucible, place in a tube furnace, carbonize for 6 hours at 900°C under an argon atmosphere, and heat up at a rate of 5°C / min to obtain a black solid; then add 30wt% HF solution and stir After 24 hours, remove the silicon dioxide, filter through an organic membrane with a pore size of 0.45 μm, and dry to obtain a black solid powder, which is an open cage-like hierarchical porous carbon material;
[0066] 4...
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