Air/vanadium redox flow battery

A vanadium redox flow battery and air technology, applied in fuel cells, regenerative fuel cells, fuel cell components, etc., can solve problems affecting battery cycle life, large electrolyte volume, electrolyte performance changes, etc., and achieve simple structure , The manufacturing process is simple, the effect of improving the specific capacity and energy density

Inactive Publication Date: 2012-09-26
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the dissolution of battery active substances in the solution and the limitation of the solubility of active substances, the electrolyte is usually bulky and generally low in energy density, which limits its wide application (Journal of The Electrochemical Society, 2011, 158 (8) R55-R79 )
Due to the use of deposition-type electrodes in single-flow batteries, the amount of electrolyte used is reduced and the energy density of flow batteries is increased. However, there is a solid-phase reaction in the deposition-type electrodes during battery charging / discharging, and the active material of the battery is between the liquid phase and the solid phase. Conversion, there are ion migration and metal dendrite formation on the electrode, which significantly affects the battery cycle life (ZL200610109424.7)
Potassium hydroxide alkaline electrolyte is usually used to dissolve active substances, and it is difficult to prevent carbon dioxide in the air from entering the electrolyte during long-term use, causing changes and deterioration in the performance of the electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add free sulfuric acid to the battery negative electrode electrolyte liquid storage tank and the concentration is 2.0mol L -1 , with a total vanadium concentration of 1.5mol L -1 of electrolyte. The gas diffusion electrode is used as the positive electrode, the graphite felt is used as the negative electrode material, and the graphite plate is used as the current collector, and the constant current charge and discharge test is carried out on the battery. Among them, the charge and discharge current density is 1mA cm -2 , The charge cut-off voltage is 1.6V, and the discharge cut-off voltage is 0.3V. The battery charge and discharge cycle test shows that the battery has good stability during multiple charge and discharge cycles, and the electrochemical performance has obvious cycle repetition characteristics, such as image 3 shown.

Embodiment 2

[0039] Add free sulfuric acid to the battery negative electrode electrolyte liquid storage tank and the concentration is 2.0mol L -1 , with a total vanadium concentration of 1.5mol L -1 of electrolyte. The gas diffusion electrode is used as the positive electrode, the graphite felt is used as the negative electrode material, and the graphite plate is used as the current collector, and the constant current charge and discharge test is carried out on the battery. Among them, the charge current density is 2mA cm -2 , discharge current density 2mA cm -2 , The charge cut-off voltage is 1.3V, and the discharge cut-off voltage is 0.3V. After many charge and discharge tests, the battery has an obvious charge and discharge process, such as Figure 4 , Figure 5 As shown, the battery has good stability, with an average current efficiency of 54.7%, a voltage efficiency of 43.1%, and an average energy efficiency of 23.6%, see Figure 6 。

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Abstract

The invention discloses an air/vanadium redox flow battery, belonging to the technical field of power and energy storage. The cell of the air/vanadium redox flow battery is mainly composed of a positive pole, a negative pole and a negative pole liquid storage tank, wherein the positive pole and the negative pole are separated by a proton transfer film; the positive pole is a gas diffusion electrode and uses oxygen and water in air as active substances; the active substance of the negative pole is a vanadium-containing electrolyte, and is arranged in the negative pole liquid storage tank; the negative pole liquid storage tank, a liquid pump and the negative pole are connected through pipelines to form an electrolyte circulation loop; and a conductive buffer layer is arranged between the positive pole and a positive pole current collector. The air/vanadium redox flow battery has the advantages of easy scale-up implementation, long circulation life, simple structure, lower material price, high energy density, high power intensity and the like, does not generate any pollutant in the whole charging/discharging process, is suitable to be used as large-scale electric energy storage equipment in a wind or solar power generation system, and can be widely used in electric power, transportations and other industries.

Description

technical field [0001] The invention belongs to the technical field of electrical storage and energy storage, and in particular relates to an air / vanadium redox flow battery. Background technique [0002] With the development of the global economy and the depletion of fossil fuels, the contradiction between energy supply and consumption has become increasingly prominent. The issue of energy security has gradually become the focus of national life and even the whole society. It has increasingly become a hidden danger of national strategic security and a bottleneck restricting the sustainable development of economy and society. . [0003] The development of new energy and renewable energy is the basic national policy of my country's energy sustainable development. The use of new energy and renewable energy can not only reduce the environmental pollution caused by the use of fossil fuels, but also optimize the energy structure, enhance energy supply capacity, and ease the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M8/02H01M8/18H01M8/04089H01M8/04186
CPCY02E60/12Y02E60/528Y02E60/10Y02E60/50
Inventor 王保国贾志军宋士强范永生
Owner TSINGHUA UNIV
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