Preparation and application of biomass carbon nanosphere cluster material

A biomass carbon and nanosphere technology, which can be applied to fuel cell-type half-cells and secondary battery-type half cells, electrical components, battery electrodes, etc. Effects of stable cycling performance, mild reaction conditions, and excellent charge-discharge reversibility

Inactive Publication Date: 2020-06-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has a large specific surface area and pore volume, the effective utilization of the reaction interface is low

Method used

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  • Preparation and application of biomass carbon nanosphere cluster material
  • Preparation and application of biomass carbon nanosphere cluster material
  • Preparation and application of biomass carbon nanosphere cluster material

Examples

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preparation example Construction

[0056] Preparation of lithium-air battery positive electrode: the biomass carbon nanosphere cluster material prepared in the examples and the binder (polyvinylidene fluoride, PVDF) are mixed and then added with a diluent (N-methylpyrrolidone, NMP) Slurry, then the slurry is coated on the current collector (carbon paper), then placed in 80 ℃ vacuum drying oven to dry, after cutting into pieces, to obtain the positive electrode sheet of lithium-air battery; wherein, carbon material: binder The mass ratio is 4:1.

[0057] Lithium-air battery assembly: the positive electrode sheet of the lithium-air battery prepared in the example is used as the positive electrode, metal lithium is used as the negative electrode, commercial (GF / D, Whatman) glass fiber membrane is used as the diaphragm, tetraethylene glycol dimethyl ether / bistrifluoro Lithium methanesulfonylimide is used as the electrolyte, and a Swagelok structure battery is assembled in an argon-filled glove phase; then the assem...

Embodiment 1

[0059] Step 1. Mix medical absorbent cotton (cellulose content close to 100%) and phosphoric acid solution (mass fraction 85%) according to the ratio of 1g:10mL, and let it stand for soaking and hydrolysis for 12 hours;

[0060] Step 2. Pre-carbonize the soaked and hydrolyzed mixture in an air atmosphere at 250°C for 5 hours;

[0061] Step 3. Put the pre-carbonized mixture into a tube furnace, heat up to 600°C at a heating rate of 10°C / min under an atmosphere of high-purity nitrogen (99.999%), and cool down naturally after carbonizing at 600°C for 1 hour;

[0062] Step 4. The carbonized material was washed and filtered with deionized water several times until the pH value of the filtrate was neutral, and the washed material was heated and dried in an oven at 80° C. for 24 hours to obtain a biomass carbon nanosphere cluster material.

[0063] Depend on figure 1 with figure 2 It can be seen that the prepared biomass carbon nanosphere cluster material is a cluster structure fo...

Embodiment 2

[0068] Step 1. Dry and pulverize the white spongy part of pomelo peel and mix it with phosphoric acid solution (mass fraction 85%) according to the ratio of 1g:10mL, let it stand and soak for 24h to hydrolyze;

[0069] Step 2. Pre-carbonize the soaked and hydrolyzed mixture in an air atmosphere at 250°C for 4 hours;

[0070] Step 3. Put the pre-carbonized mixture into a tube furnace, heat up to 600°C at a heating rate of 10°C / min under a high-purity nitrogen atmosphere (99.999%), and cool down naturally after carbonizing at 600°C for 1 hour;

[0071] Step 4. The carbonized material was washed and filtered with deionized water several times until the pH value of the filtrate was neutral, and the washed material was heated and dried in an oven at 80° C. for 24 hours to obtain a biomass carbon nanosphere cluster material.

[0072] Depend on Figure 8 It can be seen that the biomass carbon nanosphere cluster material prepared in this example is a cluster structure formed by stack...

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Abstract

The invention relates to preparation and application of a biomass carbon nanosphere cluster material, and belongs to the technical field of biomass carbon materials / metal-air batteries. Renewable biomass is used as a raw material, the biomass carbon nanosphere cluster material with the open crack type pore structure is obtained by optimizing biomass carbonization steps and conditions, the raw materials are wide in variety, cheap and renewable, the preparation process is simple, the conditions are mild, and the preparation is suitable for industrial production; the biomass carbon nanosphere cluster material prepared by the invention has rich open crack type mesoporous and macroporous structures, can contain a large number of discharge products without being blocked, is beneficial to rapid conduction of oxygen and metal ions in the material, and has a wide application prospect in various metal-air batteries and fuel batteries.

Description

technical field [0001] The invention relates to a method for preparing a carbon nanosphere cluster material from biomass and the application of the material in a lithium-air battery, belonging to the technical field of biomass carbon material / metal-air battery. Background technique [0002] Biomass carbon materials are obtained through carbonization of renewable biomass raw materials, and have unique nanostructures, good conductivity and stability. In many high specific energy battery systems, biomass carbon materials have shown excellent electrochemical performance as electrode materials. In particular, some biomass-based carbon materials with special nanostructures exhibit better performance than traditional carbon materials or inorganic electrode materials when used as electrode materials. This design idea of ​​preparing renewable biomass into high-performance electrode materials provides the possibility for the development of high specific energy and environmentally fri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96H01M12/08
CPCH01M4/88H01M4/96H01M12/08Y02E60/10
Inventor 姚莹吴锋赵托
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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