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Method for efficiently preparing integrated electrode of flow battery

A flow battery and electrode technology, applied in battery electrodes, fuel cell components, fuel cells, etc., can solve the problems of hard, brittle and easy to fall off of conductive adhesive, long curing time and low efficiency, and easy falling off of graphite felt, etc. The effect of short time, energy saving and environmental protection preparation method, and simple method

Active Publication Date: 2021-12-17
杭州德海艾科能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for efficiently preparing an integrated electrode of a flow battery, which solves the problem of poor thermal conductivity of the integrated electrode prepared by hot pressing or conductive adhesive bonding in the prior art, and requires a large High energy consumption and long time, the graphite felt is easy to fall off during use, and the conductive adhesive has the problems of being hard and brittle and easy to fall off, long curing time and low efficiency

Method used

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  • Method for efficiently preparing integrated electrode of flow battery
  • Method for efficiently preparing integrated electrode of flow battery

Examples

Experimental program
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Embodiment 1

[0031] A method for efficiently preparing an integrated electrode for a flow battery comprises the following steps:

[0032] S1: Made of 40wt% polyethylene, 20wt% conductive graphite, 20wt% artificial graphite, 15wt% carbon nanotubes, 4wt% dust-free carbon black, 0.5wt% tris[2.4-di-tert-butylphenyl] phosphite and 0.5 The mixture of wt% ethylene-vinyl acetate copolymer is uniformly mixed, and processed into a plate shape with a thickness of 0.6mm to obtain a bipolar plate;

[0033] S2: heat the graphite felt under an air atmosphere at 400°C for 10 hours to obtain a pretreated graphite felt;

[0034] S3: Soak the bipolar plate in S1 in ethanol for 5 minutes, make the surface of the bipolar plate adhere to a layer of ethanol, and take it out;

[0035] S4: stick the two pretreated graphite felts in S2 to both sides of the bipolar plate with ethanol attached to the surface in S3 to form a graphite felt / bipolar plate / graphite felt "sandwich" structure;

[0036] S5: The graphite fe...

Embodiment 2

[0038] A method for efficiently preparing an integrated electrode for a flow battery comprises the following steps:

[0039] S1: A mixture of 45wt% polyethylene, 30wt% natural graphite, 20wt% conductive graphite, 3wt% carbon nanotubes and 2wt% tris[2.4-di-tert-butylphenyl] phosphite is mixed evenly, and processed into a thickness Obtain bipolar plates for 1.4mm plate shape;

[0040] S2: Soak the graphite felt in 98% concentrated sulfuric acid at room temperature for 6 hours, take it out, wash it with deionized water, and dry it to obtain a pretreated graphite felt;

[0041] S3: Soak the bipolar plate in S1 in n-hexane for 6 minutes, attach a layer of n-hexane to the surface of the bipolar plate and take it out;

[0042] S4: stick the two pretreated graphite felts in S2 to both sides of the bipolar plate with n-hexane attached to the surface in S3 to form a graphite felt / bipolar plate / graphite felt "sandwich" structure;

[0043] S5: Superimpose 5 layers of the graphite felt / b...

Embodiment 3

[0045] A method for efficiently preparing an integrated electrode for a flow battery comprises the following steps:

[0046] S1: Composed of 42wt% polypropylene, 30wt% artificial graphite, 20wt% conductive graphite, 5wt% carbon nanotubes, 2wt% tris[2.4-di-tert-butylphenyl] phosphite and 1wt% ethylene-vinyl acetate copolymer Mix the mixture evenly, and process it into a plate shape with a thickness of 0.9mm to obtain a bipolar plate;

[0047] S2: Insulate the graphite felt under an air atmosphere at 450°C for 8 hours to obtain a pretreated graphite felt;

[0048] S3: Soak the bipolar plate in S1 in methanol for 8 minutes, make the surface of the bipolar plate adhere to a layer of methanol, and take it out;

[0049] S4: The two pretreated graphite felts in S2 are closely attached to both sides of the bipolar plate with methanol attached to the surface in S3 to form a graphite felt / bipolar plate / graphite felt "sandwich" structure;

[0050] S5: Superimpose 15 layers of graphite fe...

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Abstract

The invention discloses a method for efficiently preparing an integrated electrode of a flow battery, which comprises the following steps of: S1, well mixing plastic, a conductive auxiliary agent and an auxiliary agent, and processing a bipolar plate from the mixture; S2, pretreating graphite felts; S3, attaching a layer of volatile solvent to the surface of the bipolar plate; S4, tightly attaching the two pretreated graphite felts to the two sides of the bipolar plate with the volatile solvent attached to the surface to form a graphite felt / bipolar plate / graphite felt sandwich structure; and S5, stacking multiple layers of the graphite felt / bipolar plate / graphite felt sandwich structure, tightly laminating the multiple layers through a tablet press, introducing a direct current or an alternating current, and embedding graphite felt carbon fibers into the bipolar plate to form an integrated electrode. The flow battery integrated electrode is prepared in a current mode, the internal resistance in the finished integrated electrode can be remarkably reduced, and the efficiency of the flow battery is improved. The preparation method is simple, multiple integrated electrodes can be produced at a time, the production time is short, the efficiency is high, energy is saved, environment friendliness is achieved, and mass production is facilitated.

Description

technical field [0001] The invention relates to the technical field of a redox flow battery, in particular to a method for efficiently preparing an integrated electrode of a flow battery. Background technique [0002] Liquid flow battery is a kind of energy storage battery that realizes the mutual conversion of chemical energy and electric energy through the redox reaction of positive and negative reactive materials. It is mainly used in renewable energy (such as wind energy, solar energy, tidal energy, etc.) power generation, "Peak shaving and valley filling" of the power system, backup power stations for important facilities, etc. The flow battery stack is mainly composed of diaphragm, electrodes, bipolar plates, end plates and other parts. Among them, the electrode is the place where the electrochemical reaction occurs, and it needs to have a certain catalytic activity. Most of them use graphite felt or carbon felt with good electrochemical activity and reversibility as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96H01M8/0202H01M8/0297H01M8/18
CPCH01M4/88H01M4/96H01M8/0297H01M8/0202H01M8/188Y02E60/50
Inventor 熊仁海王宇陈广新郭勇
Owner 杭州德海艾科能源科技有限公司
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