Tremella-shaped nanosphere material assembled by inlaying molybdenum dioxide nanoparticles into carbon nanosheet, preparation of tremella-shaped nanosphere material and application of tremella-shaped nanosphere material in sodium ion battery

Abstract

The invention discloses a tremella-shaped nanosphere material assembled by inlaying molybdenum dioxide nanoparticles into carbon nanosheets, preparation of the tremella-shaped nanosphere material andapplication of the tremella-shaped nanosphere material in a sodium ion battery. In the material, MoO2 nanoparticles are inlaid in amorphous carbon nanosheets, the carbon nanosheets are interwoven andassembled into tremella-shaped nanospheres, and a large number of mesopores and other pores exist between the carbon nanosheets. The preparation method comprises the following steps of polymerizing ammonium molybdate and dopamine hydrochloride to form a precursor, and calcining to decompose and carbonize, thereby obtaining the final product. The electrochemical activity, the structural stability and the cycling stability of MoO2 can be improved, so that MoO2 has higher specific capacity and more stable cycling performance. The tremella-shaped nanosphere assembled by inlaying MoO2 nanoparticlesinto carbon nanosheets has a remarkable application value when being used as an electrode material of a sodium-ion battery.

Description

technical field

[0001] The invention relates to the technical field of sodium ion batteries, in particular to molybdenum dioxide nanoparticles embedded carbon nanosheets assembled tremella-like nanosphere materials and their preparation and application. Background technique

[0002] Although lithium-ion batteries have many advantages, there are disadvantages such as shortage of lithium resources and high cost. Compared with lithium-ion batteries, sodium-ion batteries are ideal large-scale energy storage power sources due to their rich sodium resources, relatively low cost, and high safety. Among the electrode materials for sodium-ion batteries, transition metal oxides have attracted extensive attention because of their high theoretical specific capacity, wide range of material sources, and environmental friendliness. Among them, MoO 2 The theoretical specific capacity is as high as 838mAh g -1 , and has an 8.8 x 10 -5 The low resistivity of Ω cm makes it an excellent can...

Examples

Embodiment 1

[0029] Add 30 mg of ammonium molybdate tetrahydrate into a mixed solution consisting of 15.5 mL of absolute ethanol and 8.5 mL of deionized water, and stir ultrasonically for 5 h; then add 30 mg of dopamine hydrochloride and continue stirring for 10 min; then add 0.1 mL of NH 3 Commercially available ammonia water with a concentration marked as 25 wt% was stirred and reacted at 25°C for 6 hours; the reaction product was centrifuged, washed 3 times with absolute ethanol, and dried at 60°C. Put the dried product in a quartz tube furnace, under the protection of argon, heat it to 450°C for 1h, then raise the temperature to 750°C for 1.5h, and then cool it to room temperature to obtain MoO 2 Nanoparticles inlaid with carbon nanosheets to assemble tremella-shaped nanospheres.

[0030] figure 1 is the synthetic MoO 2 The SEM photo of tremella-shaped nanospheres assembled with nanoparticle-embedded carbon nanosheets, it can be seen that the product is a uniform nanosphere with a di...

Embodiment 2

[0036] Add 30 mg of ammonium molybdate tetrahydrate into a mixed solution consisting of 15.5 mL of absolute ethanol and 8.5 mL of deionized water, and stir ultrasonically for 5 h; then add 30 mg of dopamine hydrochloride and continue stirring for 10 min; then add 0.2 mL of NH 3 Commercially available ammonia water with a concentration marked as 25 wt% was stirred and reacted at 25°C for 6 hours; the reaction product was centrifuged, washed 3 times with absolute ethanol, and dried at 60°C. Put the dried product in a quartz tube furnace, under the protection of argon, heat it to 450°C for 1h, then raise the temperature to 750°C for 1.5h, and then cool it to room temperature to obtain MoO 2 Nanoparticles inlaid with carbon nanosheets to assemble tremella-shaped nanospheres.

[0037] Product MoO 2 The microstructure of tremella-shaped nanospheres assembled with nanoparticle-embedded carbon nanosheets is the same as in Example 1, the main difference being that the carbon nanosheet...

Embodiment 3

[0040] Add 30 mg of ammonium molybdate tetrahydrate into a mixed solution consisting of 15.5 mL of absolute ethanol and 8.5 mL of deionized water, and stir ultrasonically for 5 h; then add 30 mg of dopamine hydrochloride and continue stirring for 10 min; then add 0.1 mL of NH 3 Commercially available ammonia water with a concentration of 25 wt% was stirred and reacted at 45°C for 6 hours; the reaction product was centrifuged, washed 3 times with absolute ethanol, and dried at 60°C. Put the dried product in a quartz tube furnace, under the protection of argon, heat it to 450°C for 1h, then raise the temperature to 750°C for 1.5h, and then cool it to room temperature to obtain MoO 2 Nanoparticles inlaid with carbon nanosheets to assemble tremella-shaped nanospheres.

[0041] Product MoO 2 The microstructure of tremella-shaped nanospheres assembled with nanoparticle-embedded carbon nanosheets is the same as that of Example 1, the main difference being that the tremella-shaped na...

technical field

[0001] The invention relates to the technical field of sodium ion batteries, in particular to molybdenum dioxide nanoparticles embedded carbon nanosheets assembled tremella-like nanosphere materials and their preparation and application. Background technique

[0002] Although lithium-ion batteries have many advantages, there are disadvantages such as shortage of lithium resources and high cost. Compared with lithium-ion batteries, sodium-ion batteries are ideal large-scale energy storage power sources due to their rich sodium resources, relatively low cost, and high safety. Among the electrode materials for sodium-ion batteries, transition metal oxides have attracted extensive attention because of their high theoretical specific capacity, wide range of material sources, and environmental friendliness. Among them, MoO 2 The theoretical specific capacity is as high as 838mAh g -1 , and has an 8.8 x 10 -5 The low resistivity of Ω cm makes it an excellent can...

Examples

Embodiment 1

[0029] Add 30 mg of ammonium molybdate tetrahydrate into a mixed solution consisting of 15.5 mL of absolute ethanol and 8.5 mL of deionized water, and stir ultrasonically for 5 h; then add 30 mg of dopamine hydrochloride and continue stirring for 10 min; then add 0.1 mL of NH 3 Commercially available ammonia water with a concentration marked as 25 wt% was stirred and reacted at 25°C for 6 hours; the reaction product was centrifuged, washed 3 times with absolute ethanol, and dried at 60°C. Put the dried product in a quartz tube furnace, under the protection of argon, heat it to 450°C for 1h, then raise the temperature to 750°C for 1.5h, and then cool it to room temperature to obtain MoO 2 Nanoparticles inlaid with carbon nanosheets to assemble tremella-shaped nanospheres.

[0030] figure 1 is the synthetic MoO 2 The SEM photo of tremella-shaped nanospheres assembled with nanoparticle-embedded carbon nanosheets, it can be seen that the product is a uniform nanosphere with a di...

Embodiment 2

[0036] Add 30 mg of ammonium molybdate tetrahydrate into a mixed solution consisting of 15.5 mL of absolute ethanol and 8.5 mL of deionized water, and stir ultrasonically for 5 h; then add 30 mg of dopamine hydrochloride and continue stirring for 10 min; then add 0.2 mL of NH 3 Commercially available ammonia water with a concentration marked as 25 wt% was stirred and reacted at 25°C for 6 hours; the reaction product was centrifuged, washed 3 times with absolute ethanol, and dried at 60°C. Put the dried product in a quartz tube furnace, under the protection of argon, heat it to 450°C for 1h, then raise the temperature to 750°C for 1.5h, and then cool it to room temperature to obtain MoO 2 Nanoparticles inlaid with carbon nanosheets to assemble tremella-shaped nanospheres.

[0037] Product MoO 2 The microstructure of tremella-shaped nanospheres assembled with nanoparticle-embedded carbon nanosheets is the same as in Example 1, the main difference being that the carbon nanosheet...

Embodiment 3

[0040] Add 30 mg of ammonium molybdate tetrahydrate into a mixed solution consisting of 15.5 mL of absolute ethanol and 8.5 mL of deionized water, and stir ultrasonically for 5 h; then add 30 mg of dopamine hydrochloride and continue stirring for 10 min; then add 0.1 mL of NH 3 Commercially available ammonia water with a concentration of 25 wt% was stirred and reacted at 45°C for 6 hours; the reaction product was centrifuged, washed 3 times with absolute ethanol, and dried at 60°C. Put the dried product in a quartz tube furnace, under the protection of argon, heat it to 450°C for 1h, then raise the temperature to 750°C for 1.5h, and then cool it to room temperature to obtain MoO 2 Nanoparticles inlaid with carbon nanosheets to assemble tremella-shaped nanospheres.

[0041] Product MoO 2 The microstructure of tremella-shaped nanospheres assembled with nanoparticle-embedded carbon nanosheets is the same as that of Example 1, the main difference being that the tremella-shaped na...

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