Method for preparing three-dimensional carbon nanomaterial by activating shaddock peel with strong base

A carbon nanomaterial and grapefruit peel technology is applied in the field of preparation of negative electrode materials for sodium ion batteries, which can solve the problems of increasing the contact area between the electrode material and the electrolyte, the proportion of interface atoms is high, and the van der Waals force is large and easy to bond. The effect of shortening the preparation cycle, good development prospects, and improving rate performance

Inactive Publication Date: 2016-12-14
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the specific surface area of ​​graphene can reach about 2000m2 g-1, compared with lithium, the radius of sodium (0.37nm) is much larger. High, van der Waals force, easy to bond
At present, three-dimensional carbon nanomaterials are more researched. Three-dimensional carbon nanomaterials are an important class of carbon nanomaterials. The system formed under the conditions has a high proportion of interface atoms and a large specific surface area, which increases the contact area between the electrode material and the electrolyte and promotes the deintercalation of sodium ions. Graphene and carbon nanotubes are commonly used for synthesis, but the cost Therefore, the synthesis of high-performance three-dimensional carbon nano-anode materials has become a research hotspot.

Method used

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  • Method for preparing three-dimensional carbon nanomaterial by activating shaddock peel with strong base
  • Method for preparing three-dimensional carbon nanomaterial by activating shaddock peel with strong base
  • Method for preparing three-dimensional carbon nanomaterial by activating shaddock peel with strong base

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Experimental program
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Effect test

Embodiment 1

[0039] (1) Wash the pomelo peel of the biomass prefabricated body to remove surface impurities, and shred it to obtain a uniform block A with a diameter of 5 mm;

[0040] (2) Freeze-dry the uniform block A at 0°C for 36 hours to obtain block B;

[0041] (3) Add 40 mL of 1 mol / L sulfuric acid solution to 1 g block B, and magnetically stir for 1.5 h to form a mixed liquid C;

[0042] (4) Transfer the mixed solution C to a homogeneous hydrothermal reaction kettle, seal it and put it into a homogeneous reactor, heat up to 180°C at a heating rate of 15°C / min for hydrothermal reaction for 24 hours, then cool naturally to room temperature to obtain water Thermal product D, wherein the lining of the reactor is polytetrafluoroethylene, and the filling ratio of the reactor is 40%;

[0043] (5) After the precursor D is washed and filtered, the precursor D: strong base is mixed evenly at a mass ratio of 1:3 and moved into a tube-type atmosphere furnace for carbonization. Under an argon atm...

Embodiment 2

[0046] (1) The pomelo peel of the biomass prefabricated body is cleaned and removed to remove surface impurities, and shredded to obtain a uniform block A with a diameter of 3 mm;

[0047] (2) Freeze-dry the uniform block A at -20°C for 12 hours to obtain block B;

[0048] (3) Add 50mL of 2mol / L sulfuric acid solution to 2g block B, and magnetically stir for 0.5h to form mixed solution C;

[0049] (4) Transfer the mixed liquid C to a homogeneous hydrothermal reaction kettle, seal it and put it into a homogeneous reactor, heat up to 150°C at a heating rate of 15°C / min for hydrothermal reaction for 12 hours, then cool naturally to room temperature to obtain water Thermal product D, wherein the lining of the reactor is polytetrafluoroethylene, and the filling ratio of the reactor is 50%;

[0050] (5) After washing and filtering the precursor D, mix the precursor D:strong base according to the mass ratio of 1:0.5 and move it into the tube atmosphere furnace for carbonization. Und...

Embodiment 3

[0053] (1) Wash the pomelo peel of the biomass prefabricated body to remove surface impurities, and shred it to obtain a uniform block A with a diameter of 3 mm;

[0054] (2) Freeze-drying uniform block A at 0°C for 24 hours to obtain block B;

[0055] (3) Add 60mL of 3mol / L sulfuric acid solution to 3g block B, and magnetically stir for 1h to form mixed solution C;

[0056] (4) Transfer the mixed solution C to a homogeneous hydrothermal reaction kettle, seal it and put it into a homogeneous reactor, heat up to 160°C at a heating rate of 15°C / min for hydrothermal reaction for 24 hours, then cool naturally to room temperature to obtain water Thermal product D, wherein the lining of the reactor is polytetrafluoroethylene, and the filling ratio of the reactor is 60%;

[0057] (5) After the precursor D was washed and filtered, the precursor D: strong base was mixed evenly in a mass ratio of 1:1 and moved into a tubular atmosphere furnace for carbonization. Under an argon atmosphe...

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Abstract

The invention discloses a method for preparing a three-dimensional carbon nanomaterial by activating shaddock peel with a strong base. The method comprises the steps that the shaddock peel is washed to be clean and then subjected to freeze drying, a sulfuric acid solution is added for a hydrothermal reaction, and a biomass precursor is obtained; the biomass precursor is subjected to washing, suction filtration and drying and then mixed with the strong base to be subjected to carbonization in a tubular atmosphere furnace, and a carbonization product is obtained; the carbonization product is subjected to washing and suction filtration and then dried, and the three-dimensional carbon nanomaterial, namely, a carbon negative electrode material used for sodium-ion batteries is obtained. The strong base activated shaddock peel negative electrode material prepared through the method has a three-dimensional porous connected nantostructure, the specific surface area is large, more attachment sites are provided for sodium ions, micropores can be beneficial for entering of electrolyte to increase the contact area with the electrode material, a condition is provided for rapid transmission of the sodium ions, and the capacity of the material is increased.

Description

technical field [0001] The invention belongs to the field of preparation of negative electrode materials for sodium ion batteries, and in particular relates to a method for preparing three-dimensional carbon nanomaterials by activating pomelo peels with strong alkali. Background technique [0002] Lithium-ion batteries are widely used in the portable electronics market due to their high energy density, long cycle life, and no memory effect. However, as industries such as vehicles and large-scale power systems rely more heavily on lithium-ion batteries, global lithium resources will not be able to effectively meet the huge demand for power lithium-ion batteries, which will further push up the prices of lithium-related materials and increase the battery capacity. cost, which ultimately hinders the development of the new energy industry. Therefore, it is critical to develop other related energy storage technologies that are inexpensive alternatives to lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/583H01M4/587H01M10/054
CPCC01P2004/03C01P2006/40H01M4/583H01M4/587H01M10/054Y02E60/10
Inventor 黄剑锋李瑞梓王瑞谊李文斌许占位曹丽云李嘉胤何元元
Owner SHAANXI UNIV OF SCI & TECH
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