Difunctional negative electrode and its application as all-vanadium redox energy storage battery negative electrode

An all-vanadium flow, energy storage battery technology, applied in battery electrodes, fuel cells, circuits, etc., can solve problems such as being unsuitable for large-scale application, high electrode cost, reducing hydrogen evolution, etc., to improve electrocatalytic activity and electrochemical performance. Reversibility, simple preparation method, and the effect of inhibiting hydrogen evolution

Active Publication Date: 2014-12-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] (2) Metallize electrode materials such as graphite felt, carbon paper, etc., that is, modify metal ions on the surface of carbon fibers, such as Sun et al. (Sun, B.T.; Skyllas-Kazacos, M. Chemical Modification and Electrochemical Behavior of Graphite Fiber in Acidic Vanadium Solution.Electrochim.Acta1991,36,513-517.) Modified Mn on the carbon fiber surface 2+ 、 Te 4+ 、In 3+ and Ir 3+ etc., found Ir 3+ It is most effective in improving the electrocatalytic activity of electrode materials, but due to the high cost of electrodes due to the use of noble metals, it is not suitable for large-scale applications
However, even if no overcharge occurs, the hydrogen evolution reaction will be accompanied by V 2+ / V 3+ The reactions are carried out simultaneously, so this method does not reduce hydrogen evolution

Method used

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  • Difunctional negative electrode and its application as all-vanadium redox energy storage battery negative electrode
  • Difunctional negative electrode and its application as all-vanadium redox energy storage battery negative electrode
  • Difunctional negative electrode and its application as all-vanadium redox energy storage battery negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0053] A certain size of carbon felt was impregnated in 0.01M Bi(NO 3 ) 3 HNO 3 solution, after ultrasonic dispersion for 30 min, take it out, put it in a drying oven at 105 ° C for 10 h, and then place the loaded Bi(NO 3 ) 3 The carbon felt was heated to 600°C in a nitrogen atmosphere, and H 2 Constant temperature reaction 1h, the Bi 3+ It was reduced to Bi, then cooled to room temperature under a nitrogen atmosphere, and weighed using an electronic balance to determine that the mass ratio of Bi loading was 1%.

[0054] In order to test the electrochemical activity of vanadium ion redox couple on the surface of Bi-modified carbon felt, the Bi-modified carbon felt prepared in Example 1 was tested by cyclic voltammetry. Bi-modified carbon felt was used as the working electrode, a non-porous graphite plate was used as the counter electrode, and a saturated calomel electrode was used as the reference electrode. The electrochemical testing instrument used was the CHI612 elect...

Embodiment 2

[0065] The electrodeposition solution consists of 12g / L BiCl 3 , 55g / L tartaric acid, 100g / L glycerin and 45g / L sodium chloride solution, the pH value of the solution is adjusted to about 1.0 with dilute hydrochloric acid. A carbon felt of a certain size is used as the working electrode, and the counter electrode is a graphite plate. Direct current electrochemical deposition is adopted, and the current density is 10mA / cm 2 , the deposition time is 10s. The mass ratio of Bi loading was determined to be 1% by weighing with an electronic balance.

[0066] The single cell assembly evaluation conditions are the same as in Example 1, and the difference from Example 1 is that the all-vanadium redox flow battery using the Bi-modified carbon felt in this example as the negative electrode has a current density of 80mA / cm 2 , the voltage efficiency and energy efficiency were 89.3% and 84.2% respectively; the current density increased to 120mA / cm 2 , the voltage efficiency and energy e...

Embodiment 3

[0068] A certain size of graphite felt was impregnated in 0.02M Bi(NO 3 ) 3 in the ethylene glycol solution, ultrasonically dispersed for 30min, took it out, put it in a drying oven at 200°C for 10h, and then loaded the Bi(NO 3 ) 3 The graphite felt is heated up to 500°C in a nitrogen atmosphere, and H 2 Constant temperature reaction 2h, Bi 3+ It was reduced to Bi, then cooled to room temperature under a nitrogen atmosphere, and weighed using an electronic balance to determine that the mass ratio of Bi loading was 2%.

[0069] The single cell assembly evaluation conditions are the same as in Example 1, except that the difference from Example 1 is that the current density of the all-vanadium redox flow battery using Bi-modified graphite felt as the negative electrode in this example is 80mA / cm 2 , the voltage efficiency and energy efficiency were 88.9% and 84.2% respectively; the current density increased to 120mA / cm 2 , the voltage efficiency and energy efficiency remaine...

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Abstract

A difunctional negative electrode for an all-vanadium redox energy storage battery negative electrode includes a carbon matrix material and a Bi-containing electro-catalyst modifying the surface of the carbon matrix material. The negative electrode is suitable for being used as the negative electrode of the all-vanadium redox energy storage battery, can greatly improve the electrocatalytic activity and electrochemical reversibility of an electrode material on a V<2+>/V<3+> redox reaction, and decreases the charge transfer resistance; and the negative electrode has high hydrogen evolution overpotential, can inhibit a hydrogen evolution reaction, and prolongs the work life of the battery. The difunctional negative electrode improves the voltage efficiency and energy efficiency of the all-vanadium redox energy storage battery, so the working current density of the battery is improved, and the weight, the size and the cost of the battery with same output power are greatly reduced.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technology, in particular to an electrode of an all-vanadium flow energy storage battery. Background technique [0002] All-vanadium redox flow energy storage battery has independent output power and capacity, flexible system design; high energy efficiency, long life, high operation stability and reliability, low self-discharge; large degree of freedom in site selection, no pollution, easy maintenance It has the advantages of simplicity, low operating cost, and high safety. It has broad development prospects in large-scale energy storage. It is considered to be an effective method to solve the random and intermittent unsteady characteristics of renewable energy generation systems such as solar energy and wind energy. There are significant demands in renewable energy power generation and smart grid construction. [0003] Different from the function of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/92
CPCH01M4/9083H01M8/188Y02E60/50
Inventor 刘涛张华民李先锋杨晓飞
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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