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Preparation method of macro graphene modified electrode material

A technology of graphene modification and electrode materials, applied in battery electrodes, circuits, fuel cells, etc., can solve the problems of poor electrical conductivity of carbon felt, high cost of VRB, low chemical activity, etc., and achieve improved electrical conductivity and high power density , the effect of large specific surface area

Active Publication Date: 2020-08-07
山东奥德储能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing a macro-graphene modified electrode material suitable for vanadium batteries, which solves the problems of poor electrical conductivity, low chemical activity, and specific carbon felt existing in the prior art. Low surface area, poor stability, poor performance in VRB, and high cost of VRB

Method used

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  • Preparation method of macro graphene modified electrode material
  • Preparation method of macro graphene modified electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] In the present embodiment, the preparation method of graphene modified carbon felt, the steps are as follows:

[0041] (1) if figure 1 As shown in (a), put a 20cm×20cm×5.5mm carbon felt on the graphite homogeneous sample stage at the bottom of the preparation chamber, and align the sample with the direction of the gas outlet at the top of the preparation chamber.

[0042] (2) Turn on the H on the preparation chamber 2 valve, clean for 2min, close H 2 Valve; further, repeat cleaning 4 times;

[0043](3) Turn on the CH on the preparation chamber 4 Valve, clean for 2min, close CH 4 Valve; further, repeat cleaning 4 times;

[0044] (4) Open the high vacuum valve on the preparation chamber, manually open the high vacuum unit, and vacuumize for 5 minutes, so that the vacuum degree in the preparation chamber is 2.5×10 -2 ~3×10 -3 Pa; close the high vacuum valve and manually close the high vacuum unit;

[0045] (5) Turn on H 2 Valve, adjust the gas flow rate to 150-200...

Embodiment 2

[0054] The difference from Example 1 is:

[0055] 1. In step (7), the time for preparing graphene-modified carbon felt by chemical vapor deposition is 10 minutes.

[0056] 2. The remaining same steps of Example 1 were used to prepare graphene-modified carbon felt, and the graphene loading on the graphene-modified carbon felt was 0.6wt%.

[0057] Due to the increase of the graphene deposition time, under the same conditions, the graphene load on the modified electrode increases, so the conductivity of the composite electrode is improved, which is higher than that of Example 1. Therefore, the internal resistance of the modified electrode in the all-vanadium redox flow battery is measured at room temperature to be 0.55Ω·cm 2 , the surface resistance of the composite electrode prepared at this ratio is lower than that of the original carbon felt (0.72Ω·cm 2 ), the battery energy efficiency in VRB is higher than that of pristine carbon felt, see figure 2 . Such as figure 1 As...

Embodiment 3

[0059] The difference from Example 1 is:

[0060] 1. In step (7), the time for preparing graphene-modified carbon felt by chemical vapor deposition is 15 minutes.

[0061] 2. The remaining same steps of Example 1 were used to prepare graphene-modified carbon felt, and the graphene loading on the graphene-modified carbon felt was 0.8wt%.

[0062] Due to the increase of the graphene deposition time, under the same conditions, the graphene load on the modified electrode increases, so the conductivity of the composite electrode is improved, which is higher than that of Examples 1 and 2. However, due to the increase of graphene loading, agglomeration occurs on the carbon fiber surface of the carbon felt, which affects the performance of the modified carbon felt in the vanadium battery. At the same time, due to the long deposition time, the cost of carbon felt preparation is increased, which is not conducive to the industrialization of vanadium batteries.

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Abstract

The invention provides a preparation method of a macro graphene modified electrode material, relates to the field of electrode materials for all-vanadium redox flow batteries (VRB), particularly to apreparation method of a graphene modified carbon felt suitable for high-performance and macroscopic production of an all-vanadium redox flow battery, and aims to solve the problems of poor conductivity, low specific surface area, low electrochemical activity, poor vanadium ion couple catalytic performance, low single battery performance, high cost and the like of a commercial carbon felt electrodefor a vanadium battery at the present stage. According to the invention, commercial carbon felt is used as a raw material, and a chemical vapor deposition (CVD) method is used for preparing the graphene modified carbon felt; the composite carbon felt prepared by the invention has the advantages of good conductivity, high specific surface area, good electrochemical catalytic performance, excellentchemical stability, good VRB battery performance, low cost and the like; and the preparation method disclosed by the invention has the advantages of simplicity and feasibility in operation, low product cost, easiness in industrial production, environmental friendliness and the like, and can be widely applied to the field of all-vanadium redox flow batteries.

Description

Technical field: [0001] The invention relates to the field of electrode materials for all-vanadium redox flow batteries (VRB), in particular to a method for preparing a high-performance macro-graphene modified electrode material suitable for all-vanadium redox flow batteries. Background technique: [0002] With the rapid growth of global population and rapid economic development, the energy crisis is becoming more and more serious. The development of new energy is an effective way to solve the energy crisis. Renewable clean energy is currently a hot spot in scientific research and industrial development because of its environmental friendliness and sustainability. Renewable energy generation processes such as wind and solar exhibit the disadvantages of discontinuity and instability. Therefore, it is urgent to develop efficient, environmentally friendly, low-cost, safe and reliable large-scale energy storage technology. All-vanadium redox flow battery (VRB) is widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96H01M8/18
CPCH01M4/88H01M4/8867H01M4/96H01M8/188Y02E60/50
Inventor 丁美龙婷孙其君张怡琼贾传坤
Owner 山东奥德储能科技有限公司
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