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Cellulose-based SiO2-C composite material as well as preparation and application thereof

A composite material, cellulose-based technology, applied in the field of supercapacitor electrode material preparation, can solve the problems of difficulty in controlling the morphology and structure of biomass-based carbon materials, poor conductivity of supercapacitors, hindering electron transfer efficiency, etc., so as to reduce electron transport. Impedance, increased capacitance, cost saving effect

Inactive Publication Date: 2021-04-30
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complex packing rules in carbon materials and the non-oriented structure of anisotropic hexagonal carbon layers often hinder the efficiency of electron transfer, which leads to poor conductivity of supercapacitors made of carbon materials, so it is necessary to conduct research on carbon materials. Improved doping
Considering the complexity of biomass, it is difficult to control the morphology and structure of biomass-based carbon materials by traditional technologies. Therefore, if a SiO2 suitable for supercapacitors can be explored 2 -C composite material method will have great practical significance

Method used

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  • Cellulose-based SiO2-C composite material as well as preparation and application thereof
  • Cellulose-based SiO2-C composite material as well as preparation and application thereof
  • Cellulose-based SiO2-C composite material as well as preparation and application thereof

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preparation example Construction

[0037] A cellulose-based SiO 2 -The preparation method of composite material, described preparation method specifically comprises the following steps:

[0038] (1) Get cellulose and phenol to join in the acid solution and carry out liquefaction, obtain liquefaction liquid;

[0039] (2) After adjusting the ph of the liquefied liquid obtained in step (1) to alkaline, add SiO 2 , heated in a water bath to obtain a precursor;

[0040] (3) The precursor obtained in step (2) is suction-filtered and washed, dried, and then pre-carbonized to obtain a crude product;

[0041] (4) Mix the crude product obtained in step (3) with lye evenly, continue to calcine after drying, and then obtain the target product SiO 2 -C composites.

[0042] In step (1), the acid solution is composed of sulfuric acid and phosphoric acid, the volume ratio of sulfuric acid and phosphoric acid is 1:2, the mass volume ratio of cellulose powder and phenol is 10g:30ml, the liquefaction process uses oil bath mag...

Embodiment 1

[0049] A cellulose-based SiO 2 -The preparation method of composite material, comprises the following steps:

[0050] 1) Take 10g of cellulose powder and 30ml of phenol, add 1ml of sulfuric acid and 2ml of phosphoric acid, and then liquefy under acidic conditions. The liquefaction process is heated by magnetic stirring in an oil bath at a temperature of 150°C for 3 hours;

[0051] 2) Adjust the ph of the liquefied liquid in step (1) to 9-14 with sodium hydroxide solution, and then add SiO 2 Perform a heating reaction in a water bath to obtain the precursor, the temperature is 70°C, and the reaction time is 3h;

[0052] 3) Wash the precursor obtained in step (2) with acetone and deionized water, and then place it in a vacuum drying oven to dry after suction filtration. The temperature of the drying process is 80 ° C, and the time is 10 h. The product is carried out under nitrogen atmosphere, the heating rate is 5°C / min, the pre-carbon temperature is 500°C, and the time is 2h;...

Embodiment 2

[0058] A cellulose-based SiO 2 -The preparation method of composite material, comprises the following steps:

[0059] 1) Take 10g of cellulose powder and 30ml of phenol, add 1ml of sulfuric acid and 2ml of phosphoric acid, and then liquefy under acidic conditions. The liquefaction process is heated by magnetic stirring in an oil bath at a temperature of 170°C for 2 hours;

[0060] 2) Adjust the ph of the liquefied liquid in step (1) to 9-14 with sodium hydroxide solution, and then add SiO 2 Perform a heating reaction in a water bath to obtain the precursor, the temperature is 70°C, and the reaction time is 3h;

[0061] 3) Wash the precursor obtained in step (2) with acetone and deionized water, and then place it in a vacuum drying oven to dry after suction filtration. The temperature of the drying process is 80 ° C, and the time is 10 h. The product is carried out under nitrogen atmosphere, the heating rate is 5°C / min, the pre-carbon temperature is 500°C, and the time is 2h;...

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Abstract

The invention relates to a cellulose-based SiO2-C composite material and preparation and application thereof, and the preparation method specifically comprises the following steps: (1) taking cellulose and phenol, adding into an acid solution, and liquefying to obtain a liquefied solution; (2) adjusting the pH value of the liquefied liquid obtained in the step (1) to be alkaline, adding SiO2, and carrying out a heating reaction in a water bath to obtain a precursor; (3) carrying out suction filtration and washing on the precursor obtained in the step (2), drying, and carrying out pre-carbonization treatment to obtain a crude product; and (4) uniformly mixing the crude product obtained in the step (3) with alkali liquor, drying, continuously calcining, and carrying out post-treatment to obtain the target product SiO2-C composite material. Compared with the prior art, the prepared composite material has a pore structure with excellent morphology and a Si active group, the capacitance, the cycling stability and the conductivity of the composite material are improved, the capacitance of the cellulose-based SiO2-C composite material is further improved, and the electricity storage capacity of the composite material is greatly enhanced.

Description

technical field [0001] The invention belongs to the field of supercapacitor electrode material preparation, in particular to a cellulose-based SiO 2 -C composite materials and their preparation and application. Background technique [0002] The increasing energy crisis has prompted the research and application of new energy. As a new type of energy storage device, supercapacitors have been widely used in portable devices to solve energy and environmental problems due to their high energy density and high capacitance capability. Therefore, carbon materials and metal nanomaterials that can be used to prepare supercapacitor electrode materials have received extensive attention. How to efficiently and controllably prepare carbon materials and metal nanomaterials with regular morphology and pore structure has become a research hotspot. Carbon materials with controllable morphology and pore structure can be used specifically and effectively for water treatment, gas adsorption an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B33/12H01G11/24H01G11/30H01G11/34H01G11/44
CPCC01B32/05C01B33/12H01G11/24H01G11/30H01G11/34H01G11/44C01P2004/80Y02E60/13
Inventor 蔺华林李梦琰王云云王爱民李欣袁铭霞陈哲严春阳
Owner SHANGHAI INST OF TECH
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