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Preparation method of nanometer vanadium dioxide/reticulated graphite matrix composite electrode material

A technology of vanadium dioxide and composite electrodes, which is applied in vanadium oxide, chemical instruments and methods, hybrid capacitor electrodes, etc. simple craftsmanship

Active Publication Date: 2022-07-29
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although composite electrode materials for supercapacitors with carbon materials as the matrix and metal oxides as the active material can obtain a larger specific capacity, the price of some carbon materials such as carbon fibers, carbon nanotubes, and graphene used is not cheap. will seriously limit its application in the field of energy storage

Method used

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preparation example Construction

[0029] The preparation method of nanometer vanadium dioxide / reticulated graphite-based composite electrode material comprises the following steps:

[0030] a. Expansion and activation of graphite;

[0031] b. Compounding of expanded graphite and nano-vanadium dioxide: the graphite treated in step a is evenly mixed with anhydrous ethanol and nano-vanadium dioxide; ultrasonically treated at an ultrasonic frequency of 15-35khz, then filtered, washed with anhydrous ethanol, Dry, grind into powder to obtain composite graphite;

[0032] c. Preparation of porous composite material: Mix nickel foam and composite graphite evenly, then add polymer material and mix evenly, then extrude and granulate, press into the desired shape, soak in sulfuric acid with a concentration of 15-30%, wash and dry .

[0033] In order to make the expanded graphite and the nanometer vanadium dioxide better composite, and save raw materials and energy, in step b, the volume ratio of graphite and absolute et...

Embodiment 1

[0044] According to the method of the present invention, the prepared graphite and dehydrated alcohol are mixed in a ratio of 1:1 according to the volume ratio, and the nanometer vanadium dioxide and the treated graphite are mixed uniformly according to the mass ratio of 5%, and the ultrasonic frequency is 15khz ultrasonic treatment for 20 minutes. , then suction filtered, washed with anhydrous ethanol for 3 times, dried, ground into powder with a pore size of 0.5mm, a porosity of 80%, and a porosity of 90%. Foamed nickel with a size of 0.2mm is 3:1 by mass. After mixing evenly with PP in a mass ratio of 1:3, extrude and granulate on a twin-screw, press on a press to produce a product with a thickness of 1mm, and grind both surfaces on a grinding wheel. After soaking in dilute sulfuric acid with a concentration of 15% for 72 hours, after washing and drying, the assembled supercapacitor electrode has a specific capacitance of 0.201 F cm-2 , at a charge-discharge current density ...

Embodiment 2

[0046] According to the method of the present invention, the prepared graphite and dehydrated alcohol are in a ratio of 1:2 by volume, and the nanometer vanadium dioxide and the treated graphite are mixed uniformly by mass ratio of 10%, and the ultrasonic frequency is 20khz ultrasonic treatment for 20 minutes. , then suction filtered, washed with anhydrous ethanol for 3 times, dried, ground into powder with a pore size of 5mm, a porosity of 90%, and a porosity of 92%. After mixing evenly, it is mixed with PP according to the mass ratio of 1:2, extruded and granulated on a twin-screw, and pressed into a product with a thickness of 1.5mm on a press, and the two surfaces are ground on the grinding wheel. After soaking in dilute sulfuric acid with a concentration of 20% for 48 hours, after washing and drying, the assembled supercapacitor electrode has a specific capacitance of 0.214 F cm -2 , at a charge-discharge current density of 20 mA cm -2 After 2000 cycles of charging and d...

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Abstract

The invention discloses a method for preparing a nanometer vanadium dioxide / reticular graphite-based composite electrode material. The method comprises the following steps: a. expansion and activation of graphite; b. compounding of expanded graphite and nanometer vanadium dioxide: combining the steps a. The treated graphite is evenly mixed with anhydrous ethanol and nano-vanadium dioxide; ultrasonically treated at an ultrasonic frequency of 15-35khz, then filtered, washed with anhydrous ethanol, dried, and ground into powder to obtain composite graphite; c, foamed nickel and composite graphite The graphite is mixed evenly, then polymer materials are added to mix evenly, then extruded and granulated, pressed into a desired shape, soaked in sulfuric acid with a concentration of 15-30%, washed and dried. The invention uses graphite with good electrical conductivity but low price as the matrix material, and the porous electrode material is prepared by expanding it, introducing active groups and combining with nanometer vanadium dioxide, and then compounding with the polymer material. The method of the invention is not only novel, but also short, low in cost and easy to control.

Description

technical field [0001] The invention belongs to the field of electrode material preparation, and particularly relates to a preparation method of a nanometer vanadium dioxide / reticular graphite-based composite electrode material. Background technique [0002] Supercapacitors are efficient, practical, and environmentally friendly energy storage devices, which have the advantages of higher power density, convenient control, high conversion efficiency, wide operating temperature range, and no pollution. With the improvement of its technology, the production cost is gradually reduced, and more and more applications are in the field of energy storage. It is very likely to replace the battery for energy storage in many occasions in the future. At present, the price of supercapacitors is relatively expensive and cannot be used for large-scale power storage. Therefore, reducing its production cost is an essential step for supercapacitors to further develop and replace batteries in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/46C01G31/02C01B32/21C01B32/225H01G11/24H01G11/30H01G11/32
CPCC01G31/02C01B32/21C01B32/225H01G11/30H01G11/32H01G11/46H01G11/24C01P2006/40
Inventor 李道玉陈勇彭穗姚洁
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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