Preparation method of brown alga egg-box structure-based nitrogen-doping porous carbon positive electrode material for lithium storage
A cathode material and porous carbon technology, applied in the field of preparation of nitrogen-doped porous carbon cathode materials for lithium storage, can solve the problems of limiting the energy density of lithium-ion hybrid capacitors, uncontrollable microporous structure, limited capacity, etc., and achieve rich pore channels , good application prospects, simple steps
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Embodiment 1
[0038] This embodiment relates to a method for preparing a nitrogen-doped porous carbon material for a lithium-ion hybrid capacitor based on a brown algae egg-box structure, comprising the following steps:
[0039] (1) Get a certain amount of natural kelp harvested in seawater and dry it in the sun. Dissolve 40g of urea in 360mL of deionized water to prepare a urea solution. Take 20g of dried kelp and immerse in the prepared urea solution, and soak for 24 hours under vacuum condition, so that the urea can be fully immersed in the kelp. Then the kelp soaked in urea is air-dried.
[0040] (2) Put the dried urea-containing kelp in a tube furnace, under the protection of nitrogen, calcinate at a temperature of 1000° C. for 2 hours, take it out after cooling.
[0041] (3) The carbonized sample was placed in 500 mL of hydrochloric acid solution (5 mol / L), magnetically stirred for 12 hours, filtered with suction, and washed repeatedly with deionized water until the pH value was 7. ...
Embodiment 2
[0046] This embodiment relates to a method for preparing a nitrogen-doped porous carbon material for a lithium-ion hybrid capacitor based on a brown algae egg-box structure, comprising the following steps:
[0047] (1) Dissolve 25g of calcium chloride in 500mL of deionized water and stir evenly to form a solution. Take 20g of dried sea fungus (a kind of brown algae) and soak it in the calcium chloride solution to make it fully cross-linked and dry. Get 100g urea and dissolve in 180mL deionized water to make urea solution. Immerse the pre-crosslinked sea fungus in the above urea solution for 24 hours under a vacuum condition to fully infiltrate the urea, and then dry the sample.
[0048] (2) Put the dried sea fungus containing urea in a tube furnace, under the protection of nitrogen, calcinate at 800° C. for 2 hours and take it out after cooling.
[0049] (3) The carbonized sample was placed in 500 mL of hydrochloric acid solution (5 mol / L), heated to 60° C., magnetically sti...
Embodiment 3
[0054] This embodiment relates to a method for preparing a nitrogen-doped porous carbon material for a lithium-ion hybrid capacitor based on a brown algae egg-box structure, comprising the following steps:
[0055] (1) Select a certain amount of undaria pinnatae grown in seawater, weigh 50g after drying. Dissolve 10 g of urea in 300 mL of deionized water to prepare a urea solution. Immerse 50 g of dried wakame in the above urea solution, vacuumize for 24 hours to fully penetrate the urea, and then dry the sample.
[0056] (2) Put the dried urea-containing wakame in a tube furnace, under the protection of nitrogen, calcinate at 600° C. for 2 hours, take it out after cooling.
[0057] (3) The carbonized sample was placed in 500 mL of hydrochloric acid solution (5 mol / L), magnetically stirred for 12 hours, filtered with suction, and washed repeatedly with deionized water until the pH value was 7. The pickled samples were air-dried.
[0058] (4) Take 10 g of pickled and dried w...
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