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Electrochemical treatment method for improving vanadium cell electrode material activity

An electrode material and processing method technology, applied in the field of electrochemical treatment for improving the activity of vanadium battery electrode materials, can solve the problems of decreased stability of electrode materials, decreased battery life, etc. active effect

Active Publication Date: 2009-06-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention proposes an electrochemical 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 due to heat treatment and acid treatment

Method used

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  • Electrochemical treatment method for improving vanadium cell electrode material activity
  • Electrochemical treatment method for improving vanadium cell electrode material activity
  • Electrochemical treatment method for improving vanadium cell electrode material activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Soak a polyacrylonitrile-based graphite felt or carbon felt material with a thickness of 4mm in distilled water for 24 hours, put it in a vacuum oven at 75°C for 3 hours, and store it in a desiccator filled with color-changing silica gel for later use .

[0022] (2) Put the pretreated graphite felt or carbon felt into the electrolytic cell filled with the following electrolyte (the rest is water):

[0023]

[0024] Using graphite felt or carbon felt as anode and graphite plate as cathode, electrochemical activation treatment is carried out under ultrasonic vibration, and the current density is 1.5mA / cm 2 , the treatment time is 3min, and the treatment temperature is 30°C.

[0025] (3) Soak the electrochemically activated graphite felt or carbon felt material in distilled water, ultrasonically vibrate for 10 minutes, then soak for 48 hours, then dry it in an oven at 80°C for 3 hours, and use it as an electrode material for a vanadium battery. The cation exchange...

Embodiment 2

[0029] (1) Put the viscose-based graphite felt or carbon felt material with a thickness of 5mm into distilled water for 48 hours, put it into a vacuum oven and dry it at 60°C for 5 hours, and store it in a desiccator filled with color-changing silica gel for later use.

[0030] (2) Put the pretreated graphite felt or carbon felt into the electrolytic cell filled with the following electrolyte (the rest is water):

[0031]

[0032] Using graphite felt or carbon felt as anode and DSA electrode as cathode, electrochemical activation treatment is carried out under ultrasonic vibration, and the current density is 2.0mA / cm 2 , the treatment time is 15min, and the treatment temperature is 40°C.

[0033] (3) Soak the electrochemically activated graphite felt or carbon felt material in distilled water, ultrasonically vibrate for 30 minutes, then soak for 24 hours, then dry it in an oven at 90°C for 5 hours, and use it as an electrode material for a vanadium battery. The cation exch...

Embodiment 3

[0035] (1) Soak cellulose-based graphite felt or carbon felt material with a thickness of 10mm in distilled water for 20 hours, put it in a vacuum oven at 120°C for 6 hours, and store it in a desiccator filled with color-changing silica gel for later use.

[0036] (2) Put the pretreated graphite felt or carbon felt into the electrolytic cell filled with the following electrolyte (the rest is water):

[0037]

[0038] With graphite felt or carbon felt as anode and platinum electrode as cathode, electrochemical activation treatment is carried out under ultrasonic vibration, and the current density is 3.0mA / cm 2 , the treatment time is 45min, and the treatment temperature is 25°C.

[0039] (3) Soak the electrochemically activated graphite felt or carbon felt material in distilled water, ultrasonically vibrate for 10 minutes, then soak for 30 hours, then dry it in an oven at 120°C for 3 hours, and use it as an electrode material for a vanadium battery. The cation exchange memb...

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Abstract

The invention relates to the field of battery manufacturing and energy storage, in particular to an electrochemical treatment method for improving the activity of vanadium cell electrode materials. Graphite felt or carbon felt which is used as anode is immerged in active electrolyte and carries out electrochemical active treatment in an electrobath with a certain current density and time, then the graphite felt or carbon felt is washed and dried for obtaining activated graphite felt or carbon felt electrode material. The method carries out moderate and controllable electrochemical anode activation treatment by choosing suitable activated electrolyte and current density, and overcomes the disadvantages that the stability of the electrode material is deceased owning to overoxidation of the material caused by heat and acid treatment and the service life of the battery is reduced; the method has simple process and low cost. The graphite felt or carbon felt treated by the method is used as electrode and takes a cation-exchange membrane as a diaphragm, and the anode and cathode electrolytes are 1.5M of vanadyl sulfate and 2M of sulphuric acid; after the battery is combined, the ohm internal resistance is greatly reduced, and the current efficiency, voltage efficiency and energy efficiency of the battery are obviously improved.

Description

technical field [0001] The invention relates to the fields of battery manufacturing and energy storage, in particular to an electrochemical 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 vanadium batteries are mainl...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/88H01M8/18H01M10/36
CPCY02E60/528Y02E60/12Y02E60/10Y02E60/50
Inventor 刘建国门阅陈富于严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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