Preparation method and product of red blood cell-shaped hollow carbon

Abstract

The invention belongs to the field of carbon materials, and discloses a preparation method and product of red blood cell-shaped hollow carbon. The preparation method comprises the following steps: (a)adding an initiator to a solvent, stirring evenly, then adding acetylacetonate to be stirred and dissolved to form a uniform solution; (b) adding a pyrrole monomer to the obtained solution, cleaningand drying a solid polypyrrole generated in the reaction; (c) heating and keeping the temperature of the dried polypyrrole in the presence of one or a combination of nitrogen, argon, argon-hydrogen, ammonia, H2S, or PH3 to obtain the desired red blood cell-shaped hollow carbon after cooling. The invention also provides an electrode sheet and a secondary battery prepared from the red blood cell-shaped hollow carbon prepared by the preparation method. Through the invention, the obtained carbon material can be prepared in a large scale and is low in price, the secondary battery has high specificcapacity, good cyclic stability, and very broad application prospects.

Description

technical field

[0001] The invention belongs to the field of carbon materials, and more specifically relates to a preparation method and product of red blood cell-shaped hollow carbon. Background technique

[0002] Due to its special structure and shape, carbon materials have broad application prospects in many fields, so they have received extensive attention. Compared with other shapes of carbon materials, hollow carbon has the advantages of high strength, low density, large specific surface area, high temperature resistance, acid and alkali resistance, high electrical and thermal conductivity, rich internal void space, etc. There is a huge potential for development in the field of energy and other fields. Especially in the direction of secondary battery electrode materials, although traditional graphite materials are cheap and commercially practicable, their theoretical specific capacity is low and can no longer meet the needs of future high-capacity secondary battery de...

Examples

preparation example Construction

[0032] figure 1 It is a flow chart of the preparation method of the red blood cell-shaped hollow carbon constructed according to the preferred embodiment of the present invention, such as figure 1 Shown, a kind of preparation method of red blood cell shape hollow carbon comprises the steps:

[0033] Step 1: disperse the initiator in a solvent, the solvent is deionized water or a mixture of ethanol and deionized water, and stir evenly to obtain the first mixture A;

[0034] Wherein, the molar ratio of initiator to solvent is 0.001~20:1, and when the molar ratio is 0.1~5:1, the effect is better; the initiator can be an azo initiator (such as azobisisobutyronitrile), h 2 o 2 , benzoyl, nitric acid, persulfate (such as ammonium persulfate), FeCl 3 one or more of these;

[0035] Step 2: adding a certain amount of acetylacetonate into the first mixture A and stirring evenly to obtain the second mixture B;

[0036] Among them, the concentration of acetylacetonate relative to the ...

preparation Embodiment 1

[0049] In the first step, disperse 15ml of concentrated nitric acid in 30ml of deionized water, and stir evenly to obtain solution A; in the second step, add 0.3g of molybdenum acetylacetonate to solution A, stir in a magnetic stirrer until dissolved, and obtain solution B; in the third step, add 100ul pyrrole monomer to the solution B, let it stand at 20°C for 24h, centrifuge the obtained solid product, and dry it to obtain solid C; in the fourth step, put the product C in the tube Carry out carbonization treatment in the furnace, raise the temperature to 800°C at a rate of 1.5°C / min in an argon atmosphere, keep it warm for 2 hours, and then naturally cool to room temperature, and finally obtain a nitrogen-doped red blood cell-shaped hollow carbon material.

[0050] figure 2 It is a scanning electron microscope (SEM) figure of the polypyrrole ball precursor prepared in the preferred embodiment 1 constructed according to the present invention, as figure 2 Shown is the scann...

preparation Embodiment 2

[0052] In the first step, 10ml of H 2 o 2 Disperse in 200ml of deionized water, stir evenly to obtain solution A; in the second step, add 0.3g iron acetylacetonate and 0.3g molybdenum acetylacetonate to solution A, stir in a magnetic stirrer until dissolved, and obtain solution B; Step 3: Add 200uL of pyrrole monomer to solution B, let it stand at 30°C for 0.5h, centrifuge the obtained solid product, and dry it to obtain solid C; step 4, put product C in a tube furnace Carry out carbonization treatment, raise the temperature to 1400°C at a rate of 1°C / min in a nitrogen atmosphere, keep it warm for 1min, and then naturally cool to room temperature, and finally obtain a red blood cell-shaped hollow carbon material.

technical field

[0001] The invention belongs to the field of carbon materials, and more specifically relates to a preparation method and product of red blood cell-shaped hollow carbon. Background technique

[0002] Due to its special structure and shape, carbon materials have broad application prospects in many fields, so they have received extensive attention. Compared with other shapes of carbon materials, hollow carbon has the advantages of high strength, low density, large specific surface area, high temperature resistance, acid and alkali resistance, high electrical and thermal conductivity, rich internal void space, etc. There is a huge potential for development in the field of energy and other fields. Especially in the direction of secondary battery electrode materials, although traditional graphite materials are cheap and commercially practicable, their theoretical specific capacity is low and can no longer meet the needs of future high-capacity secondary battery de...

Examples

preparation example Construction

[0032] figure 1 It is a flow chart of the preparation method of the red blood cell-shaped hollow carbon constructed according to the preferred embodiment of the present invention, such as figure 1 Shown, a kind of preparation method of red blood cell shape hollow carbon comprises the steps:

[0033] Step 1: disperse the initiator in a solvent, the solvent is deionized water or a mixture of ethanol and deionized water, and stir evenly to obtain the first mixture A;

[0034] Wherein, the molar ratio of initiator to solvent is 0.001~20:1, and when the molar ratio is 0.1~5:1, the effect is better; the initiator can be an azo initiator (such as azobisisobutyronitrile), h 2 o 2 , benzoyl, nitric acid, persulfate (such as ammonium persulfate), FeCl 3 one or more of these;

[0035] Step 2: adding a certain amount of acetylacetonate into the first mixture A and stirring evenly to obtain the second mixture B;

[0036] Among them, the concentration of acetylacetonate relative to the ...

preparation Embodiment 1

[0049] In the first step, disperse 15ml of concentrated nitric acid in 30ml of deionized water, and stir evenly to obtain solution A; in the second step, add 0.3g of molybdenum acetylacetonate to solution A, stir in a magnetic stirrer until dissolved, and obtain solution B; in the third step, add 100ul pyrrole monomer to the solution B, let it stand at 20°C for 24h, centrifuge the obtained solid product, and dry it to obtain solid C; in the fourth step, put the product C in the tube Carry out carbonization treatment in the furnace, raise the temperature to 800°C at a rate of 1.5°C / min in an argon atmosphere, keep it warm for 2 hours, and then naturally cool to room temperature, and finally obtain a nitrogen-doped red blood cell-shaped hollow carbon material.

[0050] figure 2 It is a scanning electron microscope (SEM) figure of the polypyrrole ball precursor prepared in the preferred embodiment 1 constructed according to the present invention, as figure 2 Shown is the scann...

preparation Embodiment 2

[0052] In the first step, 10ml of H 2 o 2 Disperse in 200ml of deionized water, stir evenly to obtain solution A; in the second step, add 0.3g iron acetylacetonate and 0.3g molybdenum acetylacetonate to solution A, stir in a magnetic stirrer until dissolved, and obtain solution B; Step 3: Add 200uL of pyrrole monomer to solution B, let it stand at 30°C for 0.5h, centrifuge the obtained solid product, and dry it to obtain solid C; step 4, put product C in a tube furnace Carry out carbonization treatment, raise the temperature to 1400°C at a rate of 1°C / min in a nitrogen atmosphere, keep it warm for 1min, and then naturally cool to room temperature, and finally obtain a red blood cell-shaped hollow carbon material.

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