Method for preparing high-volumetric-specific-capacitance graphene by using metal cation assisted heat treatment technology

A technology of metal cations and metal ion salts, applied in the field of preparing graphene with high volume specific capacitance, can solve the problems of low bulk density and low volume specific capacitance, and achieve high bulk density, large volume specific capacitance and high volume specific capacitance. Effect

Active Publication Date: 2021-12-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention will solve the technical problems of low bulk density and low volumetric capacitance of existing graphene materials, and provide a green and environmentally friendly method for preparing graphene with high volumetric capacitance

Method used

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  • Method for preparing high-volumetric-specific-capacitance graphene by using metal cation assisted heat treatment technology
  • Method for preparing high-volumetric-specific-capacitance graphene by using metal cation assisted heat treatment technology
  • Method for preparing high-volumetric-specific-capacitance graphene by using metal cation assisted heat treatment technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: This implementation mode is realized through the following steps:

[0035] Step 1, graphene oxide is evenly dispersed in deionized water in a ratio of 1:500 by weight ratio of graphene oxide and deionized water;

[0036] Step 2, then add anhydrous LiCl according to the weight ratio of graphene oxide and LiCl is 1:75, mix well, and then rotate at 11000r min -1Centrifuge for solid-liquid separation, and vacuum dry at 100°C for 12 hours;

[0037] Step 3, then put it into a tube furnace, heat treatment at 400°C for 60 minutes, wash with water 4 times, the ion concentration of the supernatant is less than 10 -3 mol L -1 , and then dried in vacuum at 80° C. for 4 h to obtain graphene powder.

[0038] The graphene powder prepared by the method of this embodiment is observed under a scanning electron microscope as figure 1 shown, from figure 1 It can be seen that the prepared graphene sheets in this embodiment 1 are well stacked and assembled together, and th...

Embodiment 2

[0046] Embodiment 2: This implementation mode is realized through the following steps:

[0047] Step 1, graphene oxide is evenly dispersed in deionized water in a ratio of 1:500 by weight ratio of graphene oxide and deionized water;

[0048] Step 2, then add anhydrous LiCl according to the weight ratio of graphene oxide and LiCl is 1:75, mix well, and then rotate at 11000r min -1 Centrifuge for solid-liquid separation, and vacuum dry at 100°C for 12 hours;

[0049] Step 3, then put it into a tube furnace, heat treatment at 400°C for 60 minutes, wash with water 4 times, the ion concentration of the supernatant is less than 10 -3 mol L -1 , and then dried in vacuum at 80° C. for 4 h to obtain graphene powder.

Embodiment 3

[0050] Embodiment 3: This implementation mode is realized through the following steps:

[0051] Step 1, graphene oxide is evenly dispersed in deionized water in a ratio of 1:500 by weight ratio of graphene oxide and deionized water;

[0052] Step 2, then add anhydrous LiCl according to the weight ratio of graphene oxide and LiCl is 1:400, mix well, and then rotate at 11000r min -1 Centrifuge for solid-liquid separation, and vacuum dry at 100°C for 12 hours;

[0053] Step 3, then put it into a tube furnace, heat treatment at 400°C for 60 minutes, wash with water 4 times, the ion concentration of the supernatant is less than 10 -3 mol L -1 , and then dried in vacuum at 80° C. for 4 h to obtain graphene powder.

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Abstract

The invention discloses a method for preparing high-volumetric-specific-capacitance graphene by using a metal cation assisted heat treatment technology, belongs to the technical field of supercapacitors, and aims to solve the technical problems of low bulk density and low volume specific capacitance of the existing graphene material. The method comprises the following steps: uniformly dispersing graphene oxide in deionized water; adding a metal ion salt, uniformly mixing, carrying out solid-liquid separation, and drying; and carrying out heat treatment, washing with water until the ion concentration of the supernatant is less than 10<-3> mol L<-1>, and drying to obtain the high-volumetric-specific-capacitance graphene. According to the invention, the stacking density of the graphene material prepared by the method is 0.9-1.7 gcm <-3>, and the volume specific capacitance is 200-520 Fcm <-3>; and the high-volumetric-specific-capacitance graphene is suitable for preparing a supercapacitor with high volumetric specific capacitance.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors; be specifically related to a kind of method that utilizes metal cation auxiliary heat treatment technology to prepare high volume ratio capacitance graphene. 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, and 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 and chemical 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 2630m 2 g -1 , the theoretical specific capacitance can rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184H01G11/32H01G11/86
CPCC01B32/184H01G11/32H01G11/86C01B2204/20C01B2204/22C01B2204/32Y02E60/13
Inventor 王黎东刘兆远费维栋
Owner HARBIN INST OF TECH
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