Three-dimensional self-supporting sulfur/graphene positive electrode material preparation method and lithium sulfur battery positive electrode
A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems that are not conducive to improving the energy density performance of lithium-sulfur batteries, so as to improve electronic conductivity and prolong cycle life , to alleviate the effect of the shuttle effect
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Embodiment 1
[0035] (1) A method for preparing a three-dimensional self-supporting sulfur / graphene cathode material, comprising the following steps:
[0036] Prepare graphene oxide solution:
[0037] Graphite and NaNO 3 Solid mixture, wherein the proportion of graphite in the solid is 65%, NaNO 3 The proportion in the solid is 35%, and slowly add concentrated sulfuric acid with a mixed solid amount of 1000%, and then add a stirring magnet, let the whole mixed system stir under the magnetic stirrer; after 24h, slowly add mixed solid amount of 150% Potassium permanganate; after stirring for 0.5h, transfer the beaker to a water bath at 80°C, continue to stir until the magnetic stirring fails, then take out the beaker and let it stand for 6h; slowly add 200 mL of deionized water to the mixture, and at the same time The system was manually stirred continuously to prevent danger caused by untimely heat dissipation of the system; after 2 hours of manual stirring, 30% H2O was then added 2 , whe...
Embodiment 2
[0045] (1) A method for preparing a three-dimensional self-supporting sulfur / graphene cathode material, comprising the following steps:
[0046] Prepare graphene oxide solution:
[0047] Graphite and NaNO 3 Solid mixture, wherein the proportion of graphite in the solid is 60%, NaNO 3 The proportion in the solid is 40%, and slowly add concentrated sulfuric acid with a mixed solid amount of 2000%, and then add a stirring magnet, let the whole mixed system stir under the magnetic stirrer; after 30h, slowly add mixed solid amount of 180% Potassium permanganate; after stirring for 1 hour, transfer the beaker to a water bath at 90°C, continue to stir until the magnetic stirring fails, take out the beaker, and let it stand for 7 hours; slowly add 250 mL of deionized water to the mixture, and simultaneously Constantly carry out manual stirring to prevent the danger caused by the untimely heat dissipation of the system; after 2.5 hours of manual stirring, then add 30% H 2 o 2 , whe...
Embodiment 3
[0054] (1) A method for preparing a three-dimensional self-supporting sulfur / graphene cathode material, comprising the following steps:
[0055] Prepare graphene oxide solution:
[0056] Graphite and NaNO 3 Solid mixture, wherein the proportion of graphite in the solid is 50%, NaNO 3 The proportion in the solid is 50%; and slowly add concentrated sulfuric acid with a mixed solid amount of 3000%, and then add a stirring magnet to allow the entire mixed system to stir under a magnetic stirrer; after 36h, slowly add a mixed solid amount of 200% Potassium permanganate; after stirring for 1.5h, transfer the beaker to a water bath at 100°C, continue to stir until the magnetic stirring fails, take out the beaker, and let it stand for 8h; slowly add 300 mL of deionized water to the mixture, and at the same time The system was manually stirred continuously to prevent the danger caused by the untimely heat dissipation of the system; after 3 hours of manual stirring, 30% H 2 o 2 , wh...
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