KR-20260064539-A - Ion permeable membrane for aluminum-air batteries, method for manufacturing the same, and aluminum-air battery including the same

KR20260064539AKR 20260064539 AKR20260064539 AKR 20260064539AKR-20260064539-A

Abstract

A method for manufacturing an ion-permeable membrane for an aluminum-air battery is provided, comprising the steps of: preparing a polymer in which an imidazolium functional group is bonded to a styrene chain-based polymer backbone as an ion-permeable membrane material; dispersing the ion-permeable membrane material in a solvent to produce an ion-permeable membrane source; and coating the ion-permeable membrane source onto an aluminum negative electrode to form an ion-permeable membrane.

Inventors

양우석
서종환
윤진수

Assignees

성균관대학교산학협력단

Dates

Publication Date: 20260507
Application Date: 20251021
Priority Date: 20241031

Claims (14)

A step of preparing a polymer in which an imidazolium functional group is bonded to a styrene chain-based polymer backbone as an ion-permeable membrane material; A step of preparing an ion-permeable membrane source by dispersing the ion-permeable membrane material in a solvent; and A method for manufacturing an ion-permeable membrane for an aluminum-air battery, comprising the step of forming an ion-permeable membrane by coating the ion-permeable membrane source on an aluminum negative electrode.
In Article 1, A method for manufacturing an ion-permeable membrane for an aluminum-air battery, comprising providing the above ion-permeable membrane material in an amount greater than 3 wt% and less than 15 wt%.
In Article 1, The above ion-permeable membrane material is, A method for manufacturing an ion-permeable membrane for an aluminum-air battery, comprising an ionomer having an imidazolium functional group bonded to a polymer backbone comprising a polystyrene chain composed of styrene monomers.
In Article 1, A method for manufacturing an ion-permeable membrane for an aluminum-air battery, comprising drop-casting and heat-treating the ion-permeable membrane source onto the aluminum cathode.
In Article 1, A method for manufacturing an ion-permeable membrane for an aluminum-air battery, wherein the solvent comprises a mixed solvent in which a polar solvent and a non-polar solvent are mixed in equal volume ratios.
In Article 5, The above polar solvent includes distilled water, and A method for manufacturing an ion-permeable membrane for an aluminum-air battery, wherein the above-mentioned nonpolar solvent comprises ethyl alcohol.
An ion-permeable membrane for an aluminum-air battery that selectively permeates hydroxide ions on an aluminum cathode.
In Article 7, An ion-permeable membrane for an aluminum-air battery, comprising increasing the hydroxide ion concentration on the surface of the aluminum cathode and blocking the access of water molecules.
In Article 7, An ion-permeable membrane for an aluminum-air battery, comprising reducing a parasitic reaction in which hydrogen and heat are generated at the aluminum cathode, and reducing the electron consumption used in the parasitic reaction, thereby increasing the discharge capacity of the aluminum-air battery including the aluminum cathode.
In Article 7, An ion-permeable membrane for an aluminum-air battery comprising an ionomer with an imidazolium functional group bonded to a polymer backbone comprising a polystyrene chain composed of styrene monomers.
Air anode providing hydroxide ions through an oxygen reduction reaction; An aluminum cathode facing the air anode, oxidized through the hydroxide ions, and providing electrons; and An aluminum-air battery comprising an ion-permeable membrane that selectively transmits hydroxide ions on the aluminum negative electrode.
In Article 11, The above ion-permeable membrane is, By increasing the hydroxide ion concentration on the surface of the aluminum cathode and blocking the access of water molecules, An aluminum-air battery comprising reducing parasitic reactions occurring during the oxidation process of the aluminum cathode.
In Article 12, The electrolyte further comprises providing ion conductivity between the air anode and the aluminum cathode, and An aluminum-air battery comprising water molecules contained in the above electrolyte generating hydrogen and heat during the oxidation process and parasitic reaction.
In Article 13, By the above ion-permeable membrane, the parasitic reaction is reduced, and the discharge capacity of the aluminum-air battery is increased, and An aluminum air battery comprising, by means of the above ion-permeable membrane, the hydrogen and the heat are reduced and the stability of the aluminum air battery is increased.

Description

Ion permeable membrane for aluminum-air batteries, method for manufacturing the same, and aluminum-air battery including the same The present application relates to an ion-permeable membrane for an aluminum-air battery, a method for manufacturing the same, and an aluminum-air battery comprising the same. More specifically, it relates to an ion-permeable membrane for an aluminum-air battery, a method for manufacturing the same, and an aluminum-air battery comprising the same, which improves the discharge capacity and stability of the aluminum-air battery by reducing parasitic reactions occurring during the oxidation process of an aluminum negative electrode. Aluminum-air batteries are batteries that generate electricity through the oxidation of an aluminum anode and the oxygen reduction of an air cathode, and they may have the advantage of providing a high energy density of ~8,100 Wh/kg, which is 5 to 10 times that of lithium-ion batteries. In addition, aluminum-air batteries may have the advantage of cost reduction because they utilize aluminum, which is inexpensive and highly recyclable, as a raw material. Furthermore, aluminum-air batteries may have the advantage of being environmentally friendly because they are non-toxic, have a low risk of fire due to the use of an aqueous electrolyte, and aluminum byproducts (Al(OH) ₃ ) can be recycled. Accordingly, various technologies regarding aluminum air batteries have been developed in the past. For example, Korean Registered Patent Publication No. 10-2247974 discloses an aluminum air battery comprising a housing having an internal space, an air passage disposed inside the housing, an air electrode disposed to contact the air passage, an electrolyte layer disposed below the air electrode, an aluminum metal electrode in contact with the electrolyte layer, a circulation unit for circulating the aluminum metal electrode above the housing, and a precipitate removal unit disposed in the internal space of the housing to remove an oxidation precipitate of the aluminum metal electrode, wherein the aluminum metal electrode is formed by a plurality of aluminum plates rotatably connected to circulate the electrolyte inside and the outside of the housing, and both ends of the aluminum metal electrode are provided with transfer rails, and a guide groove is formed in the housing to guide the movement of the transfer rails, wherein the guide groove is wider than the thickness of the transfer rails in the rotational region of the aluminum metal electrode. As another example, Korean Registered Patent Publication No. 10-2246948 discloses a method for manufacturing an aluminum-air battery with improved energy efficiency, comprising the steps of: preparing an oxidation electrode made of aluminum; preparing an electrolyte by mixing a corrosion inhibitor, a gelling agent, and an ionic polymer in an aqueous KOH solution; preparing an electrolyte absorption membrane and preparing a separator by applying the electrolyte to the electrolyte absorption membrane; preparing a nickel foam and compressing the nickel foam; preparing a carbon-supported transition metal oxide by supporting a transition metal oxide on a carbon support and preparing a catalyst by mixing the carbon-supported transition metal oxide, iron phthalocyanine, the carbon support, a binder, and distilled water; applying the catalyst to the nickel foam and drying the nickel foam for 30 to 90 minutes to complete a reduction electrode; and stacking the oxidation electrode, the separator, and the reduction electrode in that order to complete an aluminum-air battery. However, in conventional aluminum-air batteries, theoretical electricity production can be hindered because water in the electrolyte generates hydrogen and heat during the oxidation process of the aluminum anode. As a result, not only is the discharge capacity of the aluminum-air battery reduced, but the stability of the battery itself may also be compromised due to the hydrogen and heat. Therefore, there is a need for a method to resolve existing problems. FIG. 1 is a drawing for explaining a method for manufacturing an ion-permeable membrane for an aluminum-air battery according to an embodiment of the present application. FIG. 2 is a drawing for explaining an ion-permeable membrane for an aluminum-air battery according to an embodiment of the present application. FIG. 3 is a drawing for explaining an aluminum-air battery according to an embodiment of the present application. FIG. 4 is a drawing for explaining a method for manufacturing an ion-permeable membrane for an aluminum-air battery according to an experimental example of the present application. FIG. 5 is a photograph showing the chemical reaction of 1 M potassium hydroxide (KOH) electrolyte on the surface of an aluminum cathode with an ion-permeable membrane formed according to Experimental Examples 1-1 to 1-4 of the present application. Figure 6 is a photograph showing the chemical reaction of 1 M potassi