A kind of porous carbon/sulfur composite material, preparation method and application thereof
A technology of porous carbon materials and composite materials, applied in the field of new energy materials, can solve the problem of poor cycle stability and rate performance of carbon-sulfur composite positive electrodes, difficulty in effectively preventing the diffusion and shuttle effect of polysulfides, difficulty in controlling the uniformity of pore formation, etc. problem, to achieve the effect of simple and feasible preparation method, good conductivity and low cost
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Embodiment 1
[0042] A preparation method of porous carbon / sulfur composite material, comprising the steps of:
[0043] 1) Take 5g of rice and grind it into rice flour, add water and boil to form a rice paste gel;
[0044] 2) The rice paste gel was then frozen at -60°C for 4 hours, and freeze-dried at -62°C for 2 days to obtain the precursor rice paste.
[0045] 3) The precursor rice paste was crushed in a crusher at 100r / min for 20min to obtain granular rice paste powder.
[0046] 4) Disperse the rice flour in 20 ml of concentrated sulfuric acid, then transfer it to an oven at 100° C., and react at a constant temperature for 12 hours to obtain porous carbon containing concentrated sulfuric acid.
[0047] 5) Disperse the porous carbon containing concentrated sulfuric acid into 100ml of deionized water, soak for 0.5h, filter and wash 12 times to remove sulfuric acid, and then oven dry the product at 50°C for 10h;
[0048] 6) Calcining the product of step 5) at 1000° C. for 1 hour under an ...
Embodiment 2
[0052] A preparation method of porous carbon / sulfur composite material, comprising the steps of:
[0053] 1) Take 10g of rice and grind it into rice flour, add water and boil it to form a rice paste gel;
[0054] 2) The rice paste gel was then frozen at -50°C for 6h and freeze-dried at -62°C for 2 days to obtain the precursor rice paste.
[0055] 3) The precursor rice paste was crushed in a crusher at 300r / min for 15 minutes to obtain granular rice paste powder.
[0056] 4) Disperse the rice flour in 25ml of concentrated sulfuric acid, then transfer it to an oven at 120°C, and react at a constant temperature for 10 hours to obtain porous carbon containing concentrated sulfuric acid.
[0057] 5) Disperse the porous carbon containing concentrated sulfuric acid into 150ml of deionized water, soak for 1 hour, filter and wash 10 times to remove the sulfuric acid, and then dry the product in an oven at 60°C for 10 hours;
[0058] 6) Calcining the product of step 5) at 900° C. for ...
Embodiment 3
[0062] A preparation method of porous carbon / sulfur composite material, comprising the steps of:
[0063] 1) Take 15g of rice and grind it into rice flour, add water and boil it to form a rice paste gel;
[0064] 2) The rice paste gel was then frozen at -40°C for 10 h, and then freeze-dried at -62°C to obtain the precursor rice paste.
[0065] 3) The precursor rice paste was crushed in a crusher at 500r / min for 10 minutes to obtain granular rice paste powder.
[0066] 4) Disperse the rice flour in 30 ml of concentrated sulfuric acid, then transfer it to an oven at 150° C., and react at a constant temperature for 5 hours to obtain porous carbon containing concentrated sulfuric acid.
[0067] 5) Disperse the porous carbon containing concentrated sulfuric acid into 300ml of deionized water, soak for 2 hours, filter and wash 8 times to remove sulfuric acid; finally dry in an oven at 60°C for 8 hours;
[0068] 6) Then, the product of step 5) is calcined at 800°C for 3h under an i...
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