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Conductive carbon substrate loaded graphene aerogel composite electrode and preparation method thereof

A graphene airgel and substrate-loaded technology, applied in the field of electrodes, can solve the problems of inhibiting the electrochemical performance of active materials, destroying the 3D continuous conductive network, and reducing the performance of electrodes, so as to achieve less preparation process and improve electrochemical stability , the effect of improving the conductivity

Active Publication Date: 2021-03-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Currently, graphene airgel is used to prepare electrodes. In the second stage, after graphene airgel is ground, the original 3D continuous conductive network of graphene nanosheets in graphene airgel is destroyed; and the added When inactive materials such as conductive carbon black and binder are filled into the 3D conductive mesh, the electrochemical performance of the active material is inhibited, which reduces the performance of the electrode.
In addition, there is only a two-dimensional planar contact between the graphene airgel and the current collector, and it is easy to fall off from the current collector after a long period of electrochemical reaction.

Method used

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  • Conductive carbon substrate loaded graphene aerogel composite electrode and preparation method thereof
  • Conductive carbon substrate loaded graphene aerogel composite electrode and preparation method thereof
  • Conductive carbon substrate loaded graphene aerogel composite electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Preparation with Molybdenum Salt: Carbon Fiber Paper Supported MoS 2 The preparation method of graphene airgel composite electrode, concrete steps are as follows:

[0056] Step 1. At room temperature, 75 mg (NH 4 ) 2 MoS 4 (Ammonium tetrathiomolybdate) was added to 10 mL of graphene oxide dispersion with a concentration of 3 mg / mL (water / ethanol volume ratio 3:1, 10 mL in total), and then the mixed solution was ultrasonically oscillated to obtain a uniform Precursor solution A;

[0057] Step 2. Cut 9×3.5cm carbon fiber paper with a microtome, ultrasonically treat it with ethanol and deionized water for 10 minutes, and then dry it at 60°C for 30 minutes;

[0058] Use a pipette gun to pipette a certain volume of precursor solution A and drop it on carbon fiber paper, then put the composite into liquid nitrogen for rapid cooling, and then freeze-dry it in a freeze dryer to obtain a carbon fiber paper-loaded precursor Aerogel;

[0059] Step 3. Put the carbon fiber pap...

Embodiment 2

[0068] Preparation with Iron Salt: Carbon Cloth Supported Fe 2 o 3 The preparation method of graphene airgel composite electrode, concrete steps are as follows:

[0069] Step 1, under room temperature conditions, 120mg FeCl 3 (Ferric chloride) was added to 6mL graphene oxide dispersion solution with a concentration of 5mg / mL (water / acetone volume ratio 1:2, 6mL in total), and then the mixed solution was ultrasonically oscillated to obtain a uniform precursor solution A;

[0070] Step 2. Use a microtome to cut the carbon cloth into discs with a diameter of 14mm, ultrasonically treat with ethanol and deionized water for 10 minutes, and then dry at 60°C for 30 minutes;

[0071] Use a pipette gun to pipette a certain volume of precursor solution A and drop it on the carbon cloth, then put the composite into liquid nitrogen for rapid cooling, and then freeze-dry it in a freeze dryer to obtain a carbon cloth-loaded precursor Aerogel;

[0072] Step 3. Put the carbon cloth-loaded...

Embodiment 3

[0079] Preparation with Molybdenum Salt: Carbon Fiber Paper Supported MoS 2 The preparation method of graphene airgel composite electrode, concrete steps are as follows:

[0080] Step 1, under room temperature conditions, 180mg (NH 4 ) 6 Mo 7 o 24 ∙4H 2 O (ammonium heptamolybdate) and 22 mg of thiourea were added to 15 mL of graphene oxide dispersion with a concentration of 2 mg / mL (volume ratio of water / ethanol was 1:1, 15 mL in total), and then the mixed solution was ultrasonically oscillated. Obtain a uniform precursor solution A;

[0081] Step 2. Use a microtome to cut into discs of carbon fiber paper with a diameter of 14mm, ultrasonically treat with ethanol and deionized water for 10 minutes, and then dry at 60°C for 30 minutes;

[0082] Use a pipette gun to pipette a certain volume of precursor solution A and drop it on carbon fiber paper, then put the composite into liquid nitrogen for rapid cooling, and then freeze-dry it in a freeze dryer to obtain a carbon fib...

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Abstract

The invention discloses a conductive carbon substrate loaded graphene aerogel composite electrode and a preparation method thereof. One part of graphene aerogel of the composite electrode permeates into pores of a conductive carbon substrate, and the rest part of graphene aerogel is loaded on the surface of the conductive carbon substrate. The preparation method comprises the steps of 1, adding transition metal salt or active substance powder into a graphene oxide dispersion liquid; 2, dropwise adding a mixed solution A prepared in the step 1 onto a conductive carbon substrate, and carrying out freeze drying; and 3, putting the precursor aerogel loaded on the conductive carbon substrate into a heating furnace, and carrying out heat treatment under protective gas. The graphene aerogel composite electrode has the technical effects that grinding of the graphene aerogel is avoided, a conductive agent and a binder are not used, meshes of a graphene aerogel conductive network are not blocked, the electrical performance of the composite electrode is improved, and the composite electrode is compact in structure and does not fall off.

Description

technical field [0001] The invention belongs to the technical field of electrodes, and in particular relates to a graphene airgel composite electrode and a preparation method of the electrode. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density and long cycle life, and play an important role in portable electronic devices, electric vehicles and grid energy storage. However, currently commercial lithium-ion batteries mainly use graphite-like carbon anode materials, which have a low theoretical specific capacity (372 mAh g -1 ), and the potential platform of lithium intercalation is close to metal lithium, and fast charging is prone to "lithium separation" phenomenon, causing potential safety hazards. Sodium-ion batteries have a similar electrochemical mechanism to lithium-ion batteries, and at the same time, the abundance of sodium ions is higher, which is conducive to the reduction of battery costs. However, the sodium ion ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/366H01M4/583H01M4/133H01M4/1393H01M10/0525Y02E60/10
Inventor 王荣华袁靖徐朝和李新禄
Owner CHONGQING UNIV
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