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Air electrode catalyst for metal air batteries and preparation method thereof and preparation method of air electrode for metal air batteries

A metal-air battery and air electrode technology, applied in the direction of fuel cell half-cells and primary battery half-cells, battery electrodes, circuits, etc., can solve the problems of poor performance and stability, achieve enhanced dispersion and avoid agglomeration , the effect of increasing the space interval

Active Publication Date: 2019-08-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims at the problem of poor performance and stability of the air electrode catalyst of the existing metal-air battery; it provides a highly efficient air electrode catalyst and its preparation method and a preparation method of the air electrode of the metal-air battery

Method used

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  • Air electrode catalyst for metal air batteries and preparation method thereof and preparation method of air electrode for metal air batteries
  • Air electrode catalyst for metal air batteries and preparation method thereof and preparation method of air electrode for metal air batteries
  • Air electrode catalyst for metal air batteries and preparation method thereof and preparation method of air electrode for metal air batteries

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Embodiment 1

[0029] Embodiment 1: The preparation method of the air electrode catalyst of the metal-air battery in this embodiment is carried out according to the following steps

[0030] Step 1. According to the molecular formula NiCo 2 o x and NiCo 2 N y The molar ratio of each element in is weighed nickel nitrate, cobalt nitrate and N-methylthioacetamide, and then added to N,N-dimethylformamide to obtain a mixed solution a, which was stirred at a uniform speed at room temperature until completely dissolved , and then add polyvinylpyrrolidone to obtain the mixed solution b, magnetically stir at a uniform speed for 6 hours to obtain a clear solution, add N-methylthiourea to the mixed solution b, wherein, the moles of N-methylthiourea and nickel nitrate and cobalt nitrate The total molar ratio is 1:3, continue magnetic stirring at a constant speed for 3 hours to obtain a completely dissolved clarified electrospinning precursor solution;

[0031] Step 2. Add the electrospinning precurso...

Embodiment 2

[0037] Embodiment 2: The preparation method of the air electrode of the metal-air battery in this embodiment is carried out according to the following steps:

[0038] According to the ratio of ethanol: water: binder volume ratio of 4:1:1, take polyvinyl alcohol, ethanol and water, mix them, and ultrasonically uniform, according to the catalyst solution concentration of 8mg ml -1 Add the catalyst described in Implementation 1, and ultrasonically disperse the catalyst in the solution for 30 minutes; then evenly coat it on carbon paper and dry it for later use; cut a certain area of ​​nickel foam as the current collector, and roll it to 5MP The pressure of the catalyst layer and the current collector are pressed together.

[0039] The air electrode of the metal-air battery of this embodiment is used in the zinc-air battery test system, and the electrolyte system of the zinc-air battery is 6M potassium hydroxide and 0.2M zinc acetate.

[0040] image 3 It is the discharge polari...

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Abstract

The invention discloses an air electrode catalyst for metal air batteries and a preparation method thereof and a preparation method of an air electrode for metal air batteries, which belong to the technical field of metal air batteries. The invention aims to solve the problems of low discharge capacity and poor long-term stability of the existing metal-air battery. The preparation method includesthe following steps: weighing and taking nickel nitrate, cobalt nitrate and nitrogen source according to the molar ratio of the elements in NiCo2Ox and NiCo2Ny, dissolving the nickel nitrate, cobalt nitrate and nitrogen source in N,N-dimethylformamide, carrying out magnetic stirring at room temperature to achieve complete dissolution, adding polyvinylpyrrolidone and carrying out stirring for 6 hours, and adding a chelating agent; preparing clear electrostatic spinning precursor solution; and carrying out sintering at high temperature after electrostatic spinning. The catalyst of the inventionhas better OER and ORR performances than precious metals, and can be used in an air electrode for metal air batteries. Measurements with a zinc air battery selected as a test system show that the discharge capacity is up to 155.13mWcm<-2> and the performance is not attenuated after 600 hours of operation.

Description

technical field [0001] The invention belongs to the technical field of metal-air batteries; in particular, it relates to an air electrode catalyst of a metal-air battery, a preparation method thereof, and a preparation method of an air electrode of a metal-air battery. Background technique [0002] With the rapid development of modern society, energy issues have become the most important factor restricting social development, and energy consumption is increasing day by day, while traditional fossil energy (coal, oil, natural gas) are all disposable energy with limited reserves, and are using traditional energy while producing CO 2 , SO 2 Pollutants such as pollutants are also the chief culprits of global environmental pollution and climate warming. Therefore, the development and utilization of renewable new energy has become a major strategic goal of national development, such as solar energy, wind energy, tidal energy, etc., but they are all intermittent energy sources wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M12/06D01F9/21
CPCH01M4/9016H01M4/9083H01M4/8828H01M12/06D01F9/21
Inventor 熊岳平刘超军宗鑫李栋金英敏贾政刚
Owner HARBIN INST OF TECH
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