Preparation method for all-vanadium redox flow battery electrode material

A technology of all-vanadium redox flow battery and electrode material, which is applied in the direction of battery electrode, textile material processing, nanotechnology for materials and surface science, etc., can solve the difficulty of carbon fiber surface crystallization growth, carbon fiber axial misorientation, fiber Low degree of graphitization and other problems, to achieve the effect of easy to meet the experimental conditions, improve hydrophilicity, and simple equipment

Inactive Publication Date: 2017-08-11
SHENYANG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex three-dimensional structure of the aromatic single ring in the molecular structure of lignin and strong cross-linking bonds, the carbon fibers prepared by it have poor axial orientation and low fiber strength. The low degree of graphitization and poor electrical conductivity of the post-fiber make it difficult to become an electrode material with excellent performance

Method used

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  • Preparation method for all-vanadium redox flow battery electrode material

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Experimental program
Comparison scheme
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Embodiment 1

[0033] In this embodiment, the preparation method of the electrode material of the all-vanadium redox flow battery is as follows:

[0034]1) Dissolve the alkaline lignin into NaOH aqueous solution with a concentration of 0.5mol / L, add formaldehyde, the molar ratio of alkaline lignin + resorcinol to formaldehyde is 1:2, stir evenly, and the stirring time is 1h, The hydroxymethylation reaction was carried out, and the pH value was adjusted to 9 with NaOH aqueous solution. Add resorcinol to the above solution, and the molar ratio of alkaline lignin to resorcinol is 2:1. Then slowly add iron acetylacetonate solution, adjust the molar ratio of alkaline lignin + resorcinol to metal salt catalyst to 20:1, keep stirring until it is completely dissolved, stir vigorously until the reaction forms a gel, and the stirring time is 1h. The gel was transferred to a vacuum drying oven to dry at 80°C, and after sealing and aging, the sample was taken out and cooled to room temperature to obtai...

Embodiment 2

[0041] The difference from Example 1 is that the preparation method of the all-vanadium redox flow battery electrode material in this example is as follows:

[0042] 1) Dissolve the alkaline lignin in NaOH aqueous solution with a concentration of 0.4mol / L, add formaldehyde, the molar ratio of alkaline lignin + resorcinol to formaldehyde is 1:3, stir evenly, and the stirring time is 2h, The hydroxymethylation reaction was carried out, and the pH value was adjusted to 9 with NaOH aqueous solution. Add resorcinol to the above solution, and the molar ratio of alkaline lignin to resorcinol is 1:5. Then slowly add cobalt nitrate solution, adjust the molar ratio of alkaline lignin + resorcinol to metal salt catalyst to 30:1, keep stirring until it is completely dissolved, stir vigorously until the reaction forms a gel, and the stirring time is 3h. The gel was transferred to a vacuum drying oven to dry at 85°C, and after sealing and aging, the sample was taken out and cooled to room ...

Embodiment 3

[0049] The difference from Example 1 is that the preparation method of the all-vanadium redox flow battery electrode material in this example is as follows:

[0050] 1) Dissolve the alkaline lignin into an ammonia solution with a concentration of 0.4mol / L, add formaldehyde, the molar ratio of alkaline lignin + resorcinol to formaldehyde is 1:4, stir evenly, and the stirring time is 3h, The hydroxymethylation reaction was carried out, and the pH value was adjusted to 9 with ammonia solution. Add resorcinol to the above solution, and the molar ratio of alkaline lignin to resorcinol is 1:4. Then slowly add cobalt nitrate solution, adjust the molar ratio of alkaline lignin + resorcinol to metal salt catalyst to 40:1, keep stirring until it is completely dissolved, stir vigorously until the reaction forms a gel, and the stirring time is 4h. The gel was transferred to a vacuum drying oven to dry at 85°C, and after sealing and aging, the sample was taken out and cooled to room tempe...

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Abstract

The invention relates to the field of battery manufacturing and energy storage, in particular to a preparation method for an all-vanadium redox flow battery electrode material. The preparation method comprises the steps of taking alkaline lignin as a test material, partially substituting the hydroxymethylation alkaline lignin by a phenolic hydroxyl active functional group in an alkaline lignin structure, synthesizing organic gel from resorcinol and formaldehyde under the effect of a catalyst, preparing a precursor spinning liquid required for an experiment by taking the gel as a precursor, preparing a fiber precursor electrode material by an electrostatic spinning method, pre-oxidizing the electrode material precursor by a vacuum/atmosphere furnace, and performing carbonization in an inertia atmosphere to obtain the carbon fiber electrode material. In the vanadium battery carbon fiber electrode material prepared by the method, the fiber diameter is in nanoscale, and the specific area is greatly expanded compared with a traditional carbon felt electrode material; and due to pre-oxidization processing in post period, the oxygen content of the fiber surface is also greatly improved, and the method can be used for preparing the vanadium battery carbon fiber electrode material.

Description

technical field [0001] The invention relates to the field of battery manufacturing and energy storage, in particular to a preparation method of an all-vanadium redox flow battery electrode material. Background technique [0002] As a new type of electrochemical energy storage system, all-vanadium redox flow battery (vanadium battery) has the advantages of high efficiency, safety and environmental protection. Come to the hot spot of battery research. The electrode is one of the key materials that affect the performance of vanadium batteries. The selection of active materials and the method of modification and optimization are still under further research, which is also the main factor restricting the further industrial development and application of vanadium batteries. [0003] Carbon materials represented by graphite felt have large specific surface area, good flexibility, easy processing and assembly, and are suitable for use as electrode materials for vanadium batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88D01D5/00D04H1/43D04H1/728D06B15/00D06C7/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00D01D5/0046D01D5/0061D01D5/0069D01D5/0092D04H1/43D04H1/728D06B15/00D06C7/04H01M4/8853Y02E60/50
Inventor 陈富于马庆帮刘庆玉金虹
Owner SHENYANG AGRI UNIV
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