A battery cathode catalyst, preparation method and application in metal-air batteries

A cathode catalyst and battery technology, applied in the field of battery cathodes and metal-air batteries, can solve the problems of reducing battery energy efficiency, easy agglomeration, and reducing silver utilization efficiency, achieving good redox characteristics, improving energy efficiency, and improving oxygen efficiency. The effect of migration rate

Active Publication Date: 2020-11-06
宁波烯铝新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoscale monometallic silver as a cathode catalyst for aluminum-air batteries is prone to agglomeration during the catalytic process, which reduces the utilization efficiency of silver and reduces the energy efficiency of the battery.

Method used

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  • A battery cathode catalyst, preparation method and application in metal-air batteries
  • A battery cathode catalyst, preparation method and application in metal-air batteries
  • A battery cathode catalyst, preparation method and application in metal-air batteries

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preparation example Construction

[0030] The present invention also provides a method for preparing a battery cathode catalyst, comprising the following steps:

[0031] A) mixing and stirring silver powder, cerium salt, dispersant, complexing agent and water to obtain a sol;

[0032] B) The sol is subjected to hydrothermal reaction and calcined in sequence to obtain a battery cathode catalyst.

[0033] In the invention, silver powder, cerium salt, dispersant and complexing agent are dispersed in water and stirred to obtain sol. In the present invention, there is no special limitation on the mixing and stirring method, as long as the raw materials can be mixed and stirred to obtain a sol, and the stirring is preferably magnetic stirring. In the present invention, the mixing and stirring temperature is preferably 60-100°C, preferably 70-90°C. The mass ratio of the nano silver powder to the cerium salt is 1: (0.1~100), the mass ratio of the dispersant to the nano silver powder is 1: (0.1~10), and the mass ratio...

Embodiment 1

[0049] Take by weighing 1g nano silver powder (purchased from Aladdin company, size 60~120nm), 7g cerium nitrate according to nano silver powder and cerium salt ratio 1:7, take by weighing 3g polyvinylpyrrolidone according to dispersant and nano silver powder mass ratio 3:1, Weigh 21g of citric acid according to the mass ratio of complexing agent to cerium salt of 3:1, add it to a beaker, add 200mL deionized water, stir at 60-100°C until it is in the form of a sol, transfer the sol to a reaction kettle at 200°C The reaction was carried out for 3 hours, and then calcined at 700°C for 5 hours to obtain the cathode catalyst for the battery.

[0050] Scanning electron microscope observation and energy spectrum analysis are carried out to the battery negative electrode catalyst that above-mentioned obtains, and the result is as follows figure 1 , figure 2 with image 3 as shown, figure 1 It is an SEM image of the battery cathode catalyst provided in Example 1 of the present inv...

Embodiment 2

[0061] Take by weighing 5g nano-silver powder (purchased from Aladdin company, size 60~120nm), 1g cerium nitrate according to the ratio of nano-silver powder and cerium salt of 5:1, take by weighing 1.67g polyvinylpyrrolidone according to the mass ratio of dispersant and nano-silver powder 1:3 According to the mass ratio of complexing agent and cerium salt 1:2, weigh 0.5g of citric acid, add it to a beaker, add 200mL deionized water, stir at 80°C until it is in the form of a sol, transfer the sol to a reaction kettle at 400°C The reaction was carried out for 1 h, and then calcined at 1000 ° C for 1 h to obtain the cathode catalyst for the battery.

[0062] Carry out scanning electron microscope observation to the above-mentioned battery cathode catalyst that obtains, the result is as follows Figure 5 as shown, Figure 5 It is the SEM image of the catalyst for battery cathode provided by Example 2 of the present invention.

[0063] The particle size of the cathode catalyst o...

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Abstract

The invention provides a battery cathode catalyst. The battery cathode catalyst comprises porous cerium dioxide microspheres and silver powder, wherein the silver powder is dispersed in the cerium dioxide microspheres and on the surfaces of the cerium dioxide microspheres. In the battery cathode catalyst provided by the invention, the porous cerium dioxide microsphere is used as a stable silver carrier, the battery cathode catalyst has relatively large specific area, nanometer silver particles can be prevented from being agglomerated during the sintering and test process, so that the catalyst is maintained with relatively high catalytic activity; and moreover, cerium dioxide has favorable oxidization-reduction characteristic, oxygen can be consumed in an oxidization atmosphere and is provided in a reduction atmosphere, so that the oxygen is rapidly transferred to a three-phase interface in the cerium oxide, the oxygen migration rate is improved, and the energy efficiency of a battery is improved.

Description

technical field [0001] The invention belongs to the technical field of metal-air, and in particular relates to a catalyst for a battery cathode and a preparation method thereof, a battery cathode and a metal-air battery. Background technique [0002] Metal-air battery is a special type of fuel cell. It is a new concept battery formed by replacing the hydrogen in the negative electrode of the fuel cell with metal. During the operation of the battery, the continuous operation of the battery can be maintained by supplementing the consumed negative electrode material. Aluminum is the most stored metal on the earth. Compared with other metals, aluminum can produce greater energy density and higher energy efficiency when used as the anode material of this type of battery, and the aluminum-air battery is light in weight, less polluting, and reliable. High safety, long life, safe use and other advantages, it is called "green energy in the 21st century". The anode of aluminum-air ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/86H01M12/06
CPCH01M4/8647H01M4/9016H01M12/06
Inventor 苗鹤刘兆平张勤号董宁孙珊珊薛业建王勤
Owner 宁波烯铝新能源有限公司
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