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Air cathode of aluminum air battery, and preparation method thereof

An aluminum-air battery and air cathode technology, which is applied to battery electrodes, fuel cell-type half-cells, primary battery-type half-cells, circuits, etc., can solve the problems of high cost of graphene preparation and limited practical application

Active Publication Date: 2021-12-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high cost of graphene preparation limits its practical application

Method used

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  • Air cathode of aluminum air battery, and preparation method thereof
  • Air cathode of aluminum air battery, and preparation method thereof

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Embodiment 1

[0037] Step 1: Combine GO, KMnO 4 and MnSO 4 The powder was mixed and poured into a beaker according to the mass ratio of 1.5:2:2, then an appropriate amount of deionized water was added, supplemented by ultrasonic treatment, the ultrasonic treatment time was 10min, and the ultrasonic amplitude was 40%, to obtain uniformly dispersed GO, KMnO 4 and MnSO 4 Mix the solution, transfer the mixed solution to a polytetrafluoroethylene-lined hydrothermal reaction kettle, heat it at 120°C for 15 hours, collect the precipitate after the reaction, and centrifuge at a speed of 15000r / min for 10 minutes, and wash it three times Dry to get α-MnO 2 @MnO(OH)@GO composites.

[0038] Step 2: the α-MnO obtained in step 1 2 The @MnO(OH)@GO composite material was mixed with conductive carbon black and polytetrafluoroethylene emulsion (58% solid content) at a mass ratio of 1:2:1, and then ultrasonically dispersed by adding an appropriate amount of absolute ethanol (ultrasonic amplitude of 20% ...

Embodiment 2

[0045] Step 1: Combine GO, KMnO 4 and MnSO 4 The powder was mixed and poured into a beaker according to the mass ratio of 2:2.5:1.5, and then an appropriate amount of deionized water was added, supplemented by ultrasonic treatment, the ultrasonic treatment time was 15min, and the ultrasonic amplitude was 60%, to obtain uniformly dispersed GO and KMnO 4 and MnSO 4 Mix the solution, transfer the mixed solution to a polytetrafluoroethylene-lined hydrothermal reaction kettle, keep it warm at 160°C for 20 hours, collect the precipitate after the reaction, and use the centrifugal speed: 15000r / min, centrifugal time 15min, after centrifugal washing 5 times Dry to get α-MnO 2 @MnO(OH)@GO composites.

[0046] Step 2: the α-MnO obtained in step 1 2 The @MnO(OH)@GO composite material was mixed with conductive carbon black and polytetrafluoroethylene emulsion (63% solid content) at a mass ratio of 1.5:3:2, and then ultrasonically dispersed by adding an appropriate amount of absolute e...

Embodiment 3

[0048] Step 1: Combine GO, KMnO 4 and MnSO 4 The powder was mixed according to the mass ratio of 2:2.5:1 and poured into a beaker, then an appropriate amount of deionized water was added, supplemented by ultrasonic treatment, the ultrasonic treatment time was 12min, and the ultrasonic amplitude was 50%, to obtain uniformly dispersed GO, KMnO 4 and MnSO 4 Mix the solution, transfer the mixed solution to a polytetrafluoroethylene-lined hydrothermal reaction kettle, keep it warm at 150°C for 16 hours, collect the precipitate after the reaction, and use the centrifugal speed: 12000r / min, centrifugal time 12min, after centrifugal washing 4 times Dry to get α-MnO 2 @MnO(OH)@GO composites.

[0049] Step 2: the α-MnO obtained in step 1 2 @MnO(OH)@GO composite material is mixed with conductive carbon black and polytetrafluoroethylene emulsion (60% solid content) at a mass ratio of 1.5:2:2, and then ultrasonically dispersed by adding an appropriate amount of absolute ethanol (ultras...

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Abstract

The invention discloses an air cathode of an aluminum air battery, and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out ultrasonic dispersion, hydrothermal treatment, centrifugal washing and drying on GO, KMnO4 and MnSO4 to obtain an alpha-MnO2@MnO(OH)@GO composite material in which alpha-MnO2 nanorods, MnO(OH) nanorods and flaky GO are uniformly distributed, then pressing a slurry obtained by mixing the alpha-MnO2@MnO (OH)@GO composite material, conductive carbon black and polytetrafluoroethylene emulsion (with the solid content of 58-63%) according to a mass ratio of (1-1.5): (2-3): (1-2) as a catalyst layer, a foamed nickel current collection layer coated with the catalyst layer slurry and a waterproof breathable layer together to obtain the air cathode. According to the air cathode, the discharge voltage and the discharge stability of the aluminum air battery can be remarkably improved, the performance of the air cathode is close to that of a commercial 20% Pt / C air cathode, and the air cathode has a wide commercial application prospect.

Description

technical field [0001] The invention belongs to the field of air cathode preparation of aluminum-air batteries, and specifically relates to a novel α-MnO 2 @MnO(OH)@GO composite material as electrocatalyst for aluminum-air battery air cathode and its preparation method. Background technique [0002] With the intensification of environmental pollution and energy consumption, the demand for clean and renewable energy is becoming more and more urgent. Among various metal-air batteries, aluminum-air batteries have attracted extensive attention due to their low cost, light weight, non-toxicity, non-pollution, high safety, and recyclability, and are a promising energy storage device. However, aluminum-air batteries are still in their infancy, and there are still many problems to be solved, such as the slow oxygen reduction reaction rate of the air electrode, the high self-corrosion rate of aluminum, the Al 2 o 3 and Al(OH) 3 The deposits hinder the performance of the battery. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M12/06
CPCH01M4/9016H01M4/9083H01M4/8828H01M12/06H01M2004/8689Y02E60/50
Inventor 刘志伟刘毅陈咪高义民郑巧玲
Owner XI AN JIAOTONG UNIV
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