Surface modification treatment method for increasing activity of vanadium battery electrode materials

An electrode material and surface modification technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as complicated steps, reduced battery life, and decreased electrode material stability, and achieve mild processing methods, improved energy efficiency, and stable performance. Effect

Inactive Publication Date: 2012-05-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention proposes a surface modification treatment method for improving the activity of vanadium battery electrode materials, which overcomes the disadvantages of decreased stability of electrode materials and reduced battery life due to overoxidation of materials caused by heat treatment and acid treatment, and overcomes the shortcomings of The complicated steps of noble metal modification and the influence of high temperature sintering

Method used

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  • Surface modification treatment method for increasing activity of vanadium battery electrode materials
  • Surface modification treatment method for increasing activity of vanadium battery electrode materials
  • Surface modification treatment method for increasing activity of vanadium battery electrode materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Put the polyacrylonitrile-based graphite felt or carbon felt material with a thickness of 4 mm into deionized water for ultrasonic cleaning for 20 minutes, put it in an oven for 3 hours at 75° C., and store it in a desiccator for use.

[0035] (2) The carboxy multi-walled carbon nanotubes with a substitution rate of 2.31wt% were ultrasonically dispersed in a mixed solvent of dimethylformamide and acetone (the two were mixed in any ratio) to prepare a dispersion liquid. Wherein, the ultrasonic dispersion time is 20 minutes, and the content of carboxyl multi-walled carbon nanotubes in the dispersion liquid is 1 g / L.

[0036] (3) Put the ultrasonically cleaned graphite felt or carbon felt into the dispersion, soak for 24 hours, take it out and dry it in an oven at 100°C for 3 hours, then it can be used as the electrode material of the vanadium battery, and the battery can be assembled.

[0037] Such as figure 1 As shown, the polyacrylonitrile-based graphite felt modif...

Embodiment 2

[0039] (1) Put the viscose-based graphite felt or carbon felt material with a thickness of 5 mm into deionized water for ultrasonic cleaning for 30 minutes, put it in an oven for 4 hours at 100° C., and store it in a desiccator for later use.

[0040] (2) The hydroxyl multi-walled carbon nanotubes with a substitution rate of 2.97wt% were ultrasonically dispersed in a mixed solvent of dimethylformamide and ethanol (the ratio of the two is arbitrary) to prepare a dispersion liquid. Wherein, the ultrasonic dispersion time is 30 minutes, and the content of carboxyl multi-walled carbon nanotubes in the dispersion liquid is 2 g / L.

[0041] (3) Put the graphite felt or carbon felt material after ultrasonic cleaning into the dispersion liquid, soak for 36 hours, take it out and dry it in an oven at 90°C for 4 hours, then it can be used as the electrode material of the vanadium battery, and the battery can be assembled.

[0042] Such as figure 2 As shown, the viscose-based graphite f...

Embodiment 3

[0044] (1) The cellulose-based graphite felt or carbon felt material with a thickness of 10mm was ultrasonically cleaned in deionized water for 10 minutes, dried in an oven at 80°C for 5 hours, and stored in a desiccator for later use.

[0045] (2) The hydroxyl multi-walled carbon nanotubes with a substitution rate of 1.5% were ultrasonically dispersed in a mixed solvent of dimethylformamide and acetone (the ratio of the two is arbitrary) to prepare a dispersion liquid. Wherein, the ultrasonic dispersion time is 20 min, and the content of carboxyl multi-walled carbon nanotubes in the dispersion liquid is 4 g / L.

[0046](3) Put the ultrasonically cleaned graphite felt or carbon felt into the dispersion, soak for 20 hours, take it out and dry it in an oven at 80°C for 5 hours, then it can be used as the electrode material of the vanadium battery, and the battery can be assembled.

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Abstract

The invention, relating to the field of battery production and energy storage, discloses a surface modification treatment method for increasing the activity of vanadium battery electrode materials, comprising the following steps: immersing a graphite-felt or carbon-felt material in a dispersion liquid of multi-walled carbon nanotubes for soaking, then cleaning, drying to obtain a modified graphite-felt or carbon-felt electrode material. According to the invention, mild and controllable surface modification treatment on the electrodes is carried out by using the multi-walled carbon nanotubes, the disadvantages of stability reduction of electrode materials and battery life shortening caused by peroxidation of the materials due to heat treatment and acid treatment are overcome, the technology is simple, and the cost is low. According to the invent, the graphite-felt or carbon-felt treated by the method as electrodes, a cation-exchange membrane as a separator, and positive and negative electrolytes which both consist of 1.5 M vanadyl sulfate and 2 M sulfuric acid form a battery, and the current efficiency, voltage efficiency, and energy efficiency of the battery are all obviously improved.

Description

technical field [0001] The invention relates to the fields of battery manufacturing and energy storage, in particular to an electrochemical surface modification treatment method for improving the activity of vanadium battery electrode materials. Background technique [0002] All-vanadium redox flow battery (vanadium battery) is a secondary energy system that uses redox reactions between vanadium ions in different valence states to store and convert energy. Its characteristics are: no emission pollution, adjustable capacity, long cycle life, deep high current density discharge, fast charging, and high energy conversion rate. As an energy storage power source, vanadium batteries are mainly used in power station peak regulation, large-scale photoelectric conversion, energy storage power for wind power generation, and as energy storage systems in remote areas, uninterruptible power supplies or emergency power systems. [0003] At present, the electrode materials used in vanadiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 刘建国李文跃严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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