CN104882624A - Anthraquinone flow battery - Google Patents

Abstract

The invention relates to an anthraquinone flow battery. Active substances in the anthraquinone flow battery are anthraquinone and derivates thereof; anthraquinone, an acid additive and water form an electrolyte; the anthraquinone flow battery comprises a positive electrode, a negative electrode, a first electrolyte storage tank, a second electrolyte storage tank, a first pump and a second pump; an ion-selective film is arranged between the positive electrode and the negative electrode; a space between the positive electrode and the negative electrode is divided into a positive half battery cavity filled with an anthraquinone electrolyte and a negative half battery cavity filled with an anthraquinone electrolyte by virtue of the ion-selective film. A redox reaction is performed by virtue of charging and discharging, so that a charge-discharge flow battery is formed. The active substance (anthraquinone) of the anthraquinone flow battery is a pure organic substance, and the active substances of other liquid batteries are inorganic substances, so that the specific energy of the anthraquinone flow battery is greatly improved, the price advantage of the anthraquinone flow battery is obvious; the open-circuit voltage of a single anthraquinone flow battery is not less than 2.5V. The invention provides a concept of utilizing an organic substance as a flow battery for the first time, so that batteries are transited from inorganic substances to organic substances.

Description

Anthraquinone flow battery

technical field

The invention relates to a battery, in particular to an anthraquinone flow battery.

Background technique

According to different active materials, there are three common types of flow batteries: zinc-bromine flow battery, sodium polysulfide/bromine flow battery and all-vanadium flow battery.

The development of new flow batteries is a hot spot in battery research in recent years. The difference between them and lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, solar cells, fuel cells, and lithium batteries is that the active materials of flow batteries exist in the electrolyte In the battery rather than on the plates, this allows it to have higher energy without the fear of the entire battery failing due to plate damage. From this perspective, the life of the flow battery is almost infinite. In addition, the materials used for zinc-bromine flow batteries are also relatively cheap. Therefore, the battery cost is low, which is conducive to large-scale promotion and use, and is suitable for buses, minibuses, sightseeing cars, and large-scale storage of electricity.

In the prior art, the main technical problems of flow batteries are: all-vanadium batteries are expensive, and the aqueous solution of bromine and bromine salts in zinc-bromine flow batteries and sodium polysulfide/bromine flow batteries is corrosive to battery materials. Therefore These types of batteries are difficult to commercialize.

Contents of the invention

The purpose of the present invention is to provide a liquid flow battery with simple structure, reliable performance and low cost.

In order to solve the above technical problems, the present invention provides an anthraquinone flow battery, and the active material of the anthraquinone flow battery is anthraquinone and its derivatives. The electrolyte solution composed of anthraquinone, acidic additives and water undergoes redox reactions through charge and discharge to form a charge-discharge flow battery. Enquinone, the active material of anthraquinone flow batteries, is a pure organic substance, while the active substances of other flow batteries are inorganic substances. This greatly increases the specific energy of the battery, and the price advantage is also very obvious. The open circuit voltage of a single cell of an anthraquinone flow battery is as high as 2.5 volts or more. The present invention is the first time to propose the concept of pure organic matter as a liquid flow battery. Make the battery transition from the world of inorganic matter to the world of organic matter.

Technical solution of the present invention: an anthraquinone flow battery includes a positive electrode, a negative electrode, a first electrolyte liquid storage tank, a second electrolyte liquid storage tank, a first pump and a second pump, and the positive electrode and the negative electrode The ion-selective membrane is arranged in between, and the ion-selective membrane separates the positive electrode and the negative electrode to form a positive half-cell cavity filled with anthraquinone electrolyte and a negative half-cell cavity filled with anthraquinone electrolyte; the positive half-cell The inlet of the chamber communicates with the outlet of the first electrolyte liquid storage cylinder through the first pump, the outlet of the positive half-cell chamber communicates with the inlet of the first electrolyte liquid storage cylinder; the inlet of the negative half-cell chamber passes through the second pump It communicates with the outlet of the second electrolyte storage cylinder, and the outlet of the negative half-cell cavity communicates with the inlet of the second electrolyte storage cylinder.

The electrolyte of the anthraquinone liquid flow battery is composed of anthraquinone, an acidic additive and water, so that the anthraquinone forms a solution or an emulsion for better dispersion.

The active substance in the electrolyte of the anthraquinone flow battery is anthraquinone and its derivatives, including one or a mixture of two or more of anthraquinone, hydroxyanthraquinone, naphthoquinone, phenanthrenequinone, and dianthrone.

Described acid auxiliary agent is the strong acid such as sulfuric acid, phosphoric acid or nitric acid.

The positive electrode and the negative electrode are graphite-based conductive materials.

The anthraquinone liquid flow battery in the present invention stores energy in the anthraquinone electrolyte, and under the action of the power of the first pump and the second pump, the electrolyte is respectively stored in the first and second liquid storage tanks and stack nodes. The closed circuit formed circulates and flows, and the potential difference between the redox reaction electrode pair is used as the driving force for the reaction. It has the characteristics of simple structure, reliable performance and low cost.

Description of drawings

The accompanying drawing is a schematic diagram of the connection of the anthraquinone liquid flow battery of the present invention.

In the figure: 1 positive electrode; 2 negative electrode; 3 first electrolyte storage tank; 4 second electrolyte storage tank; 5 first pump; 6 second pump; 7 ion selective membrane; 8 user; 9 positive Half-cell cavity; 10 Negative half-cell cavity.

Detailed ways

The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

The attached drawing shows the structural principle diagram of the anthraquinone liquid flow battery in the present invention. As shown in the drawings, the zinc-bromine flow battery includes a positive electrode 1, a negative electrode 2, a first electrolyte storage tank 3, a second electrolyte storage tank 4, a first pump 5 and a second pump 6, An ion-selective membrane 7 is arranged between the positive electrode 1 and the negative electrode 2, and the ion-selective membrane 7 separates the positive electrode 1 and the negative electrode 2 to form a positive half-cell cavity filled with electrolyte 9 and a negative half-cell cavity 10 filled with electrolyte. The inlet of the positive half-cell cavity 9 communicates with the outlet of the first electrolyte storage cylinder 3 through the first pump 5, and the outlet of the positive half-cell cavity 9 communicates with the first electrolyte storage cylinder 3. The inlet of the liquid cylinder 3 is connected; the inlet of the negative half-cell cavity 10 is connected with the outlet of the second electrolyte liquid storage cylinder 4 through the second pump 6, and the outlet of the negative half-cell cavity 10 is connected with the The inlet of the second electrolyte storage cylinder 4 is connected. When working, the energy is stored in the electrolyte composed of anthraquinone, acid additives and water. Under the power of the first pump and the second pump, the electrolyte is respectively stored in the above-mentioned first and second liquid storage tanks and batteries. Circulating flow in a closed loop, the potential difference between the redox reaction electrode pair is the driving force for the reaction to occur. The electrolyte is an electrolyte composed of anthraquinone, an acidic additive and water.

Claims (2)

1. An anthraquinone flow battery, comprising a positive electrode, a negative electrode, a first electrolyte liquid storage tank, a second electrolyte liquid storage tank, a first pump and a second pump, arranged between the positive electrode and the negative electrode In the ion-selective membrane, the ion-selective membrane separates the positive electrode and the negative electrode to form a positive half-cell cavity filled with anthraquinone electrolyte and a negative half-cell cavity filled with anthraquinone electrolyte; The inlet communicates with the outlet of the first electrolyte storage cylinder through the first pump, and the outlet of the positive half-cell cavity communicates with the inlet of the first electrolyte storage cylinder; the inlet of the negative half-cell cavity communicates with the second pump through the second pump. The outlet of the electrolyte liquid storage cylinder is connected, and the outlet of the negative half-cell cavity is connected with the inlet of the second electrolyte liquid storage cylinder; it is characterized in that, The active substances in the electrolyte of the anthraquinone flow battery are anthraquinone and its derivatives; The electrolyte of the anthraquinone flow battery includes anthraquinone, an acidic additive and water, so that the anthraquinone forms a solution or an emulsion; Described acid auxiliary agent is sulfuric acid, phosphoric acid or nitric acid; The positive electrode and the negative electrode are graphite conductive materials. 2. The anthraquinone flow battery according to claim 1, characterized in that, said anthraquinone and its derivatives comprise one or Mix two or more.