Mesoporous carbon material, elemental sulfur and preparation method for mesoporous carbon composite material

Abstract

Provided is a preparation method for a mesoporous carbon material. The preparation method comprises the following steps: pore forming agents and carbon precursors are mixed uniformly and a mixture is obtained, the mixture is processed for 2-3h at the temperature of 120-160 DEG C, and mesoporous carbon precursors are obtained, and the mass ratio of the pore forming agents to the carbon precursors is 4:6-6:4; the mesoporous carbon precursors are subjected to heat treatment at the temperature of 600-900 DEG C and under protection gases, and the mesoporous carbon material is obtained after separation and purification. In the preparation method, a hard template method is employed for preparation of the mesoporous carbon material, the operation is simple, good pore size distribution is achieved, and the mesoporous carbon material facilitates high dispersion of sulfur. In addition, the strong adsorptivity of the material can inhibit dissolution and loss of polysulfides effectively, and the mesoporous carbon material is helpful to raise the utilization rate of active sulfur.

Description

technical field

[0001] The invention relates to the field of electrode materials, in particular to a preparation method of mesoporous carbon material, elemental sulfur and mesoporous carbon composite material. Background technique

[0002] With the continuous development of human social productivity, people's demand for energy in daily production and life has increased dramatically. To cope with the growing global energy shortage, traditional primary batteries are gradually being replaced by reusable secondary batteries. At the same time, the rapid development of current communications, portable electronic devices, electric vehicles and space technology has put forward higher and higher requirements for battery performance. Traditional secondary batteries have low capacity, poor safety performance and bulky volume. It is not conducive to carrying and is gradually replaced by new lithium secondary batteries. It is of great significance to develop new lithium secondary batte...

Examples

preparation example Construction

[0039] see figure 1 , the preparation method of the mesoporous carbon material of an embodiment, comprises the following steps:

[0040] Step S101: Mix the pore-forming agent and the carbon precursor to obtain a mixture, and treat the mixture at 120-160° C. for 2-3 hours to obtain a mesoporous carbon precursor, wherein the mass ratio of the pore-forming agent to the carbon precursor is 4:6~6:4.

[0041]The operation of mixing the pore-forming agent and the carbon precursor to obtain the mixture is: dissolving the pore-forming agent in the first solvent to prepare a pore-forming agent solution, dissolving the carbon precursor in the second solvent to prepare a carbon precursor solution , mixing the pore-forming agent solution and the carbon precursor solution to obtain a mixed solution, drying the mixed solution and removing excess water to obtain a mixture. For example, the mixed solution was heated and evaporated at 80° C. for 6 h under magnetic stirring to remove excess wa...

Embodiment 1

[0067] Preparation of Mesoporous Carbon Materials

[0068] In this example, the hard template method was used to prepare the mesoporous carbon material, and the nano-calcium carbonate used was nano-calcium carbonate (American Special Minerals Corporation). Specifically include the following steps:

[0069] Mix the nano-calcium carbonate and carbon precursor sucrose at a mass ratio of 4:6. Specifically, dissolve 8 g of nano-calcium carbonate in 20 ml of ethanol, and then mix with 0.2 L of 0.175 mol / L sucrose solution. The mixture was heated and evaporated at 80°C for 6h under magnetic stirring to remove the moisture inside, and then dried at 160°C for 2h pre-carbonization.

[0070] Finally, carbonization was carried out at 800 °C for 2 h in a tube furnace under a nitrogen atmosphere. The high-temperature carbonized product was placed in dilute hydrochloric acid to remove nano-calcium carbonate, and after drying, 3 g of mesoporous carbon material was obtained, with a yield of ...

Embodiment 2

[0072] Preparation of Mesoporous Carbon Materials

[0073] In this example, the hard template method was used to prepare the mesoporous carbon material, and the nano-alumina used was nano-alumina (American Special Minerals Corporation). Specifically include the following steps:

[0074] Mix nano-alumina and carbon precursor glucose at a mass ratio of 6:4. Specifically, dissolve 12g of nano-alumina in 20ml of ethanol, and then mix with 0.2L of 0.12mol / L glucose solution. The mixture was heated and evaporated at 80°C for 6h under magnetic stirring to remove the moisture inside, and then dried at 120°C for 2.5h pre-carbonization.

[0075] Finally, it was carbonized at 600°C for 2.5h in a tube furnace under a nitrogen atmosphere. The high-temperature carbonized product was placed in dilute hydrochloric acid to remove nano-alumina, and 2 g of mesoporous carbon material was obtained after drying, with a yield of about 25%.

technical field

[0001] The invention relates to the field of electrode materials, in particular to a preparation method of mesoporous carbon material, elemental sulfur and mesoporous carbon composite material. Background technique

[0002] With the continuous development of human social productivity, people's demand for energy in daily production and life has increased dramatically. To cope with the growing global energy shortage, traditional primary batteries are gradually being replaced by reusable secondary batteries. At the same time, the rapid development of current communications, portable electronic devices, electric vehicles and space technology has put forward higher and higher requirements for battery performance. Traditional secondary batteries have low capacity, poor safety performance and bulky volume. It is not conducive to carrying and is gradually replaced by new lithium secondary batteries. It is of great significance to develop new lithium secondary batte...

Examples

preparation example Construction

[0039] see figure 1 , the preparation method of the mesoporous carbon material of an embodiment, comprises the following steps:

[0040] Step S101: Mix the pore-forming agent and the carbon precursor to obtain a mixture, and treat the mixture at 120-160° C. for 2-3 hours to obtain a mesoporous carbon precursor, wherein the mass ratio of the pore-forming agent to the carbon precursor is 4:6~6:4.

[0041]The operation of mixing the pore-forming agent and the carbon precursor to obtain the mixture is: dissolving the pore-forming agent in the first solvent to prepare a pore-forming agent solution, dissolving the carbon precursor in the second solvent to prepare a carbon precursor solution , mixing the pore-forming agent solution and the carbon precursor solution to obtain a mixed solution, drying the mixed solution and removing excess water to obtain a mixture. For example, the mixed solution was heated and evaporated at 80° C. for 6 h under magnetic stirring to remove excess wa...

Embodiment 1

[0067] Preparation of Mesoporous Carbon Materials

[0068] In this example, the hard template method was used to prepare the mesoporous carbon material, and the nano-calcium carbonate used was nano-calcium carbonate (American Special Minerals Corporation). Specifically include the following steps:

[0069] Mix the nano-calcium carbonate and carbon precursor sucrose at a mass ratio of 4:6. Specifically, dissolve 8 g of nano-calcium carbonate in 20 ml of ethanol, and then mix with 0.2 L of 0.175 mol / L sucrose solution. The mixture was heated and evaporated at 80°C for 6h under magnetic stirring to remove the moisture inside, and then dried at 160°C for 2h pre-carbonization.

[0070] Finally, carbonization was carried out at 800 °C for 2 h in a tube furnace under a nitrogen atmosphere. The high-temperature carbonized product was placed in dilute hydrochloric acid to remove nano-calcium carbonate, and after drying, 3 g of mesoporous carbon material was obtained, with a yield of ...

Embodiment 2

[0072] Preparation of Mesoporous Carbon Materials

[0073] In this example, the hard template method was used to prepare the mesoporous carbon material, and the nano-alumina used was nano-alumina (American Special Minerals Corporation). Specifically include the following steps:

[0074] Mix nano-alumina and carbon precursor glucose at a mass ratio of 6:4. Specifically, dissolve 12g of nano-alumina in 20ml of ethanol, and then mix with 0.2L of 0.12mol / L glucose solution. The mixture was heated and evaporated at 80°C for 6h under magnetic stirring to remove the moisture inside, and then dried at 120°C for 2.5h pre-carbonization.

[0075] Finally, it was carbonized at 600°C for 2.5h in a tube furnace under a nitrogen atmosphere. The high-temperature carbonized product was placed in dilute hydrochloric acid to remove nano-alumina, and 2 g of mesoporous carbon material was obtained after drying, with a yield of about 25%.

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