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A kind of preparation method of graphene with high volume specific capacitance

A graphene and specific capacitance technology, applied in the direction of graphene, hybrid capacitor electrodes, nano-carbon, etc., can solve the problems of low volume specific capacitance and low packing density, and achieve large volume specific capacitance, high packing density and high packing density. Effect

Active Publication Date: 2022-03-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention solves the technical problems of low bulk density and low volume specific capacitance of existing graphene materials, and provides a simple, easy and pollution-free preparation method of graphene

Method used

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  • A kind of preparation method of graphene with high volume specific capacitance
  • A kind of preparation method of graphene with high volume specific capacitance
  • A kind of preparation method of graphene with high volume specific capacitance

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Experimental program
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Embodiment 1

[0031] Embodiment 1: The preparation method of the reduced graphene oxide with high volume specific capacitance in this embodiment is realized through the following steps:

[0032] Step 1. Evenly disperse the graphene oxide in the deionized water according to the weight ratio of graphene oxide and deionized water as 1:500, and add the mass concentration according to the weight ratio of graphene oxide and phosphoric acid as 1:800 It is 85% phosphoric acid solution, mix well;

[0033] Step 2: Microwave heating at 250°C for 40 minutes, solid-liquid separation, and freeze-drying at -50°C for 24 hours to obtain reduced graphene oxide with high volume specific capacitance;

[0034] From figure 1 It can be seen that the prepared graphene has a tight composite stack, and there are many wrinkles and large holes on the surface. From figure 2 It can be seen that the prepared sample only contains two elements, carbon and oxygen, and the atomic ratio C / O of carbon and oxygen content is...

Embodiment 2

[0036]Embodiment 2: the preparation method of the graphene with high volume specific capacitance in the present embodiment is realized through the following steps:

[0037] Step 1. Evenly disperse graphene oxide in deionized water at a weight ratio of graphene oxide to deionized water of 1:1000, and add mass concentration according to a weight ratio of graphene oxide to phosphoric acid of 1:800 It is 85% phosphoric acid solution, mix well;

[0038] Step 2: Microwave heating at 350° C. for 50 minutes, solid-liquid separation, and freeze-drying at -50° C. for 24 hours to obtain reduced graphene oxide with high volume specific capacitance.

[0039] The graphene bulk density of the present embodiment is 1.1g cm -3 , the volume specific capacitance is 250F cm -3 .

Embodiment 3

[0040] Embodiment 3: the preparation method of the reduced graphene oxide with high volume specific capacitance in the present embodiment is realized through the following steps:

[0041] Step 1. Evenly disperse graphene oxide in deionized water at a weight ratio of graphene oxide to deionized water of 1:500, and add mass concentration according to a weight ratio of graphene oxide to phosphoric acid of 1:400. It is 85% phosphoric acid solution, mix well;

[0042] Step 2: Microwave heating at 250° C. for 40 minutes, the temperature reaches 250° C., and freeze-drying at -50° C. for 24 hours to obtain graphene with high volume specific capacitance.

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Abstract

The invention discloses a preparation method of graphene with high volume specific capacitance, belonging to the technical field of energy storage materials. The invention aims to solve the technical problems of low packing density and low volume specific capacitance of existing graphene materials. The method of the present invention: 1. uniformly disperse the carbon source in the phosphoric acid aqueous solution; 2. heat treatment at 200°C-550°C for 5min-90min, separate solid-liquid, and dry to obtain graphene with high volume specific capacitance. The graphene material prepared by the invention has the advantages of good wettability, high bulk density, large volume specific capacitance, excellent rate performance, stable cycle and the like. Graphene packing density of the present invention is 1.1-1.7g cm ‑3 , the volume specific capacitance is 170‑500F cm ‑3 .

Description

technical field [0001] The invention belongs to the technical field of energy storage materials; in particular, it relates to a preparation method of graphene with high volume ratio capacitance. Background technique [0002] As a new type of energy storage device, supercapacitor has the advantages of high power density, long cycle life, low maintenance cost and environmental protection. It is a research hotspot in the field of new energy. Carbon materials are widely used as electrode materials due to their stable structure, high electrical conductivity, and low production cost. Among many carbon materials, graphene has attracted widespread attention due to its excellent physical, chemical and mechanical properties, such as high specific surface area and good electron mobility. Theoretical calculations show that the specific surface area of ​​single-layer graphene can reach 2675m 2 g -1 , with a quantum capacitance of ~21 μF cm -2 , if the specific surface area can be uti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/182C01B32/184H01G11/32
CPCC01B32/182C01B32/184H01G11/32Y02E60/13
Inventor 王黎东费维栋刘兆远李杰
Owner HARBIN INST OF TECH