CN110676471A - Aluminum-air battery air cathode material based on Co-MOF structure and preparation method thereof - Google Patents
Aluminum-air battery air cathode material based on Co-MOF structure and preparation method thereof Download PDFInfo
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Abstract
Compared with the traditional aluminum-air battery cathode material, the Co-MOF structure-based air-aluminum battery cathode material has the advantages of high porosity, easiness in oxygen transportation, simple process, no need of a binder, high catalyst stability based on the MOF structure, high catalytic efficiency due to the inclusion of a manganese oxide and Co material composite catalyst, high specific capacity of the prepared electrode, and capability of meeting the requirements of the aluminum-air battery on flexibility and ultrathin thickness.
Description
Technical Field
The invention specifically relates to the technical field of battery materials, and particularly relates to an aluminum-air battery air cathode material based on a Co-MOF structure and a preparation method thereof.
Background
With the rapid development of electronic devices, metal-air batteries have attracted much attention due to their advantages of high specific energy, environmental friendliness, safety in fuel transportation, convenience in maintenance, and the like, such as lithium-air batteries, zinc-air batteries, aluminum-air batteries, and the like. The aluminum-air battery is mainly composed of an aluminum anode, an air cathode, an electrolyte and a current collector. The reaction substance of the air cathode is oxygen in the air, whereinA catalyst is included to promote the redox and oxygen evolution reactions. The catalyst mainly comprises cheap catalyst (such as MnO)2) Noble metal catalysts (e.g. Pt), perovskites (e.g. ABO)3) And metal organic macrocyclic chelate catalysts (such as MTAA), wherein the cheap catalyst MnO is widely applied2. But the power density of the metal-air battery using the cheap catalyst is only 50-70mW/cm2The power density of the battery using the noble metal catalyst can reach 100 mW/cm2The above. However, the noble metal catalyst is expensive and has poor stability, and thus the requirement of commercial application is difficult to meet. Therefore, there is a need for an air cathode catalyst with low cost, high stability and high catalytic efficiency.
The MOF (metal Organic framework) is a porous material with a periodic network structure formed by self-assembling transition metal ions and Organic ligands, and has the advantages of high porosity, large specific surface area, adjustable pore diameter and the like. The ZIF is a zeolite imidazolate framework material, and organic imidazolate is connected to a transition metal in a crosslinking mode to form a tetrahedral framework. ZIF-67 contains cobalt ions and 2-methylimidazole and has been used in the preparation of air cathode catalyst materials, such as "Lijiarong, Zhoujian, Douqibo", et al3O4The preparation method of @ CoP composite electrode is described in CN 105977467A [ P]. 2016". Preparation method of zinc-air battery catalyst and its application in catalyzing ORR, OER and HER reactions, CN 109037710A [ P ]]2018) and Wang Xiao Dong (Wang Xiao Dong, a preparation method of a zinc-air battery catalyst material, CN 107994236A [ P]2018) and the like, are used for preparing the catalyst suitable for the zinc-air battery based on the Co-MOF material, but the catalyst material is single, and the catalytic strength is low.
At present, the preparation process of the air cathode of the aluminum air battery is generally a template method, a columnar template, a brush coating method, a blade coating method, a spray coating method or a rolling method. The method for preparing the electrode has low specific surface area and inevitably needs a binder. The electrostatic spinning is a novel non-woven forming technology, can prepare electrode materials based on a three-dimensional microstructure, and articles for preparing electrodes by applying the technology are introduced, such as Sunku, Luhai latitude, Lida and the like. The three-dimensional electrode of the mesoporous material prepared by the electrostatic spinning method can effectively shorten the diffusion distance of ions and can provide higher energy density and circulation capacity under smaller size. And the preparation process is simple, and the spinning can be directly finished on the collector without a binder.
Disclosure of Invention
In order to solve the technical defects in the prior art, the invention provides an aluminum air battery air cathode material based on a Co-MOF structure and a preparation method thereof.
The technical solution adopted by the invention is as follows: an aluminum air battery air cathode material based on a Co-MOF structure, wherein a catalyst material in the air cathode is MnO based on an MOF (ZIF-67) structure, and the air cathode is prepared by an electrostatic spinning method.
A preparation method of the Co-MOF structure-based air cathode material of the aluminum-air battery comprises the following steps:
(1) preparation of ZIF-67 based cathode catalyst:
first, alpha-MnO is prepared2The nano-wire is prepared by dissolving 0.1 ~ 1.5g of potassium permanganate in 10 ~ 80ml of deionized water, adding hydrochloric acid into the solution, uniformly stirring the solution, ultrasonically oscillating the solution for 2 ~ 30 minutes, placing the uniformly mixed solution in a reaction kettle, reacting the solution at 120 ~ 200 ℃ for 10 ~ 20 hours, cooling the solution to room temperature after the reaction is finished, centrifugally separating the solution, washing the solution for 1 ~ 5 times by using the deionized water and ethanol solution, and drying the obtained precipitate for 5 ~ 20 hours at 40 ~ 70 ℃ to obtain alpha-MnO, wherein the precipitate is dried for 5 ~ hours at 40 ~ ℃ to obtain alpha-MnO2Adding 0.1 ~ 2.5.5 g 2-methylimidazole into 5 ~ 70ml methanol solvent, stirring uniformly to obtain solution a, adding 0.1 ~ 1.5.5 g alpha-MnO2Nanowires and 1 ~ 8gCo (NO)3)2·6H2Adding O into 10 ~ 80ml of methanol solvent, uniformly stirring to obtain a solution b, mixing the solution a and the solution b, uniformly stirring at room temperature, ultrasonically oscillating for 2 ~ 30 minutes, centrifugally separating, washing for 2-5 times by using the methanol solution, drying for 5 ~ 20 hours at 40 ~ 80 ℃ and 80 ℃, heating the obtained powdery substance to 500-900 ℃ for 2 ~ 8 hours under the protection of inert gas, wherein the temperature change rate is 5 ~ 10 ℃ per minute, and thus obtaining a cathode catalyst based on ZIF-67;
(2) preparation of air cathode of aluminum air battery
The prepared 30 ~ 60 ZIF-67 carbon-mg cathode catalyst, 30 ~ 60 ZIF-67 carbon and 3 ~ 010 carbon black are dissolved in 100 ~ 400N-methyl pyrrolidone solution, the mixture is uniformly stirred and ultrasonically oscillated for 20 ~ 60 minutes to form uniform and stable solution, the solution is filled into an injector, the injector is filled into an injection pump, the needle is connected with a high-voltage power supply, the distance between the needle and a substrate 15 ~ 30 cm, the flow rate is controlled to be 0.1 ~ 0.9.9 ml/h, a nano-fiber mesh structure can be obtained on the surface of the substrate, the nano-fiber mesh structure is heated to 150 ~ 400 ℃, kept for 15 ~ 60 minutes, cooled to room temperature, then heated to 450 ~ 700 ℃ under the protection of inert gas, the temperature change rate is 3 ~ 8 ℃ per minute, and cooled to the room temperature, and the MOF Co-based air cathode material is obtained.
The injector in the step (2) is a stainless steel needle.
And (3) selecting a current collector, a nickel net or a compact stainless steel net as the substrate in the step (2).
The high-voltage regulation range of the high-voltage power supply in the step (2) is 12 ~ 30 kV.
The invention has the beneficial effects that: compared with the traditional aluminum-air battery cathode material, the air-aluminum battery cathode material based on the Co-MOF structure has high porosity, is easy for oxygen transportation, has simple process, does not need a binder, has high catalyst stability based on the MOF structure, simultaneously contains a manganese oxide and Co material composite catalyst, has high catalytic efficiency, and can meet the requirement of aluminum-air battery on flexibility and ultrathin property.
Drawings
Fig. 1 is a battery discharge test curve.
Fig. 2 is a battery power density test curve.
Detailed Description
Dissolving 0.35g of potassium permanganate in 35ml of deionized water, adding hydrochloric acid into the deionized water, stirring the solution for 10 minutes, carrying out ultrasonic oscillation for 15 minutes, placing the uniformly mixed solution in a reaction kettle, reacting the solution at a high temperature of 120 ~ 200 ℃ for 10 ~ 20 hours, cooling the solution to room temperature after the reaction is finished, carrying out centrifugal separation, washing the solution for 3 times by using the deionized water and ethanol solution, and drying the obtained precipitate for 10 hours at a temperature of 50 ℃ to obtain the alpha-MnO 2 nanowire.
0.82g of 2-methylimidazole was added to 25ml of methanol solvent and stirred uniformly to obtain a solution a. 60 mg α -MnO2 nanowire and 0.36g Co (NO3) 2.6H 2O were added to 25ml methanol solvent and stirred uniformly to obtain solution b. And mixing the solution a and the solution b, uniformly stirring at room temperature, and ultrasonically shaking for 30 minutes. The mixture was centrifuged, washed 2 times with methanol solution and dried at 50 ℃ for 10 hours. The obtained powdery material was heated to 700 ℃ for 4 hours under the protection of argon gas, with a temperature change rate per minute, to obtain a ZIF-67 based cathode catalyst.
The prepared cathode catalyst of 40 mg ZIF-67, 40 mg activated carbon and 5 mg acetylene black are dissolved in 160 mg N-methyl pyrrolidone solution, stirred uniformly and ultrasonically vibrated for 30 minutes to form a uniform stable solution. And (3) loading the syringe, wherein the syringe is preferably a stainless steel needle, the syringe is loaded in a syringe pump, and the stainless steel needle is connected with a high-voltage power supply. Preferably, the nickel mesh current collector is used as a substrate and is grounded. The high-voltage regulation range is 20kV, the distance between the stainless steel needle head and the substrate is 20 cm, and the flow rate is controlled to be 0.3 ml/h. Obtaining a nanofiber net structure on the surface of a current collector, heating to 400 ℃, keeping for 20min, cooling to room temperature, then heating to 700 ℃ under the protection of inert gas (argon), cooling to room temperature at a temperature change rate of 5 ℃ per minute, and obtaining the air cathode material based on the MOF structure.
Taking an aluminum-air cell as an example, the metal anode is aluminum foil, and the air cathode is based on a Co-MOF structure, MnO, prepared according to the method of the invention2The air cathode of the catalyst and the electrolyte are PAA gel electrolyte. DrawingsFor the discharge test and the power density test of the aluminum-air battery, compared with the air cathode prepared by the traditional brush coating method and the air cathode based on the Co-MOF structure, the aluminum-air battery based on the air cathode of the Co-MOF structure discharges at the same current density, the discharge voltage is higher than that of the aluminum-air battery with the brush coating electrode, and the power density can reach 158 mW cm-2And the catalytic efficiency of the cathode catalyst is higher than that of the traditional electrode.
The skilled person should understand that: although the invention has been described in terms of the above specific embodiments, the inventive concept is not limited thereto and any modification applying the inventive concept is intended to be included within the scope of the patent claims.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (5)
1. An aluminum air battery air cathode material based on a Co-MOF structure is characterized in that a catalyst material in the air cathode is MnO based on an MOF (ZIF-67) structure, and the air cathode is prepared by an electrostatic spinning method.
2. A method for preparing an aluminum air battery air cathode material based on a Co-MOF structure according to claim 1, comprising the following steps:
(1) preparation of ZIF-67 based cathode catalyst:
first, alpha-MnO is prepared2Nano wire, 0.1 ~ 1.5.5 g potassium permanganate is dissolved in 10 ~ 80ml deionized water, hydrochloric acid is added into the solution, the solution is stirred evenly, ultrasonic oscillation is carried out for 2 ~ 30 minutes, the evenly mixed solution is placed in a reaction kettle, the reaction is carried out for 10 ~ 20 hours at the high temperature of 120 ~ 200 ℃, after the reaction is finished,cooling the solution to room temperature, centrifuging, washing with deionized water and ethanol solution for 1 ~ 5 times, drying the obtained precipitate at 40 ~ 70 deg.C for 5 ~ 20 hr to obtain alpha-MnO2Adding 0.1 ~ 2.5.5 g 2-methylimidazole into 5 ~ 70ml methanol solvent, stirring uniformly to obtain solution a, adding 0.1 ~ 1.5.5 g alpha-MnO2Nanowires and 1 ~ 8g Co (NO)3)2·6H2Adding O into 10 ~ 80ml of methanol solvent, uniformly stirring to obtain a solution b, mixing the solution a and the solution b, uniformly stirring at room temperature, ultrasonically oscillating for 2 ~ 30 minutes, centrifugally separating, washing for 2-5 times by using the methanol solution, drying for 5 ~ 20 hours at 40 ~ 80 ℃ and 80 ℃, heating the obtained powdery substance to 500-900 ℃ for 2 ~ 8 hours under the protection of inert gas, wherein the temperature change rate is 5 ~ 10 ℃ per minute, and thus obtaining a cathode catalyst based on ZIF-67;
(2) preparing an air cathode of an aluminum air battery, namely dissolving the prepared cathode catalyst of 30 ~ 60 ZIF-67, 30 ~ 60 carbon-on-active carbon and 3 ~ 010 carbon-on-acetylene black into a 100 ~ 400N-methyl pyrrolidone solution, stirring uniformly, ultrasonically oscillating for 20 ~ 60 minutes to form a uniform and stable solution, filling the solution into an injector, filling the injector into an injection pump, connecting a needle with a direct current high-voltage power supply, keeping the needle at a distance of 15 ~ 30 cm from a substrate, controlling the flow rate at 0.1 ~ 0.9ml/h, obtaining a nano-fiber mesh structure on the surface of the substrate, heating to 150 ~ 400 ℃, keeping the temperature for 15 ~ 60min, cooling to room temperature, heating to 450 ~ 700 ℃ under the protection of inert gas, cooling to the room temperature at a temperature change rate of 3 ~ 8 ℃ per minute, and cooling to the room temperature to obtain the air cathode material based on the Co-MOF structure.
3. The method for preparing the air cathode material of the aluminum-air battery based on the Co-MOF structure, according to the claim 2, is characterized in that the injector in the step (2) is a stainless steel needle.
4. The preparation method of the Co-MOF structure-based air cathode material for the aluminum-air battery, according to claim 2, characterized in that the substrate in the step (2) is selected from a current collector, a nickel net or a dense stainless steel net.
5. The preparation method of the Co-MOF structure-based air cathode material for the aluminum-air battery, according to claim 2, wherein the high voltage regulation range of the direct current high voltage power supply in the step (2) is 12 ~ 30 kV.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112538692A (en) * | 2020-11-05 | 2021-03-23 | 中国地质大学（北京） | Co-Mn bimetallic organic framework derived porous carbon fiber and preparation method and application thereof |
| CN113036138A (en) * | 2021-03-09 | 2021-06-25 | 电子科技大学 | Preparation method and application of three-dimensional porous lithium-philic composite material |
| CN114602332A (en) * | 2020-12-09 | 2022-06-10 | 中国科学院大连化学物理研究所 | New concept molecular sieve membrane and preparation method and application thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112538692A (en) * | 2020-11-05 | 2021-03-23 | 中国地质大学（北京） | Co-Mn bimetallic organic framework derived porous carbon fiber and preparation method and application thereof |
| CN112538692B (en) * | 2020-11-05 | 2021-11-05 | 中国地质大学（北京） | Co-Mn bimetallic organic framework derived porous carbon fiber and preparation method and application thereof |
| CN114602332A (en) * | 2020-12-09 | 2022-06-10 | 中国科学院大连化学物理研究所 | New concept molecular sieve membrane and preparation method and application thereof |
| CN113036138A (en) * | 2021-03-09 | 2021-06-25 | 电子科技大学 | Preparation method and application of three-dimensional porous lithium-philic composite material |
| CN113036138B (en) * | 2021-03-09 | 2022-10-14 | 电子科技大学 | Preparation method and application of three-dimensional porous lithium-philic composite material |
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Application publication date: 20200110 |