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Preparation method of a low polarization lithium-air battery cathode catalyst material

A technology of air batteries and catalytic materials, which is applied in the field of electrochemistry, can solve the problems of high price, large-scale commercialization of catalysts, and high cost, and achieve low cost, which is conducive to cost control and large-scale production, and the effect of good repeatability of results

Active Publication Date: 2019-07-30
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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Problems solved by technology

However, the main problem with the use of noble metal catalysts is their high cost, which prevents these catalysts from being commercialized on a large scale

Method used

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  • Preparation method of a low polarization lithium-air battery cathode catalyst material
  • Preparation method of a low polarization lithium-air battery cathode catalyst material
  • Preparation method of a low polarization lithium-air battery cathode catalyst material

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preparation example Construction

[0014] The preparation method of the low polarization lithium-air battery cathode catalyst material proposed by the present invention comprises the following steps:

[0015] (1) 15 mL of graphene oxide solution with a concentration of 5 to 10 mg / mL obtained by the Hummers method (J.Am.Chem.Soc. 1958, 80, 1339) or 15 mL with a concentration of 5 to 10 mg / mL obtained by the Hummers method The oxidized carbon nanotube solution was added to 60mL of deionized water to dilute, ultrasonically treated for 30 minutes, and dispersed evenly; then 5mL of palladium chloride (PdCl 2 ) aqueous solution or 5 mL of ruthenium trichloride hydrate (RuCl 3 ·3H 2 0), sonicated for 15 minutes to disperse evenly, stirred for 8 to 12 hours to obtain a homogenate; 5 mL of hydrazine hydrate solution with a mass percent concentration of 70 to 85% was added dropwise to the stirred homogenate, stirred for 15 minutes, and Put it into a hydrothermal reaction kettle with a polytetrafluoroethylene liner, and...

Embodiment 1

[0020] (1) Add 15 mL of 5 mg / mL graphene oxide solution obtained by the Hummers method into 60 mL of deionized water for dilution, and disperse evenly by ultrasonication for 30 min. Then add 5 mL of 1.5 mg / mL PdCl 2 aqueous solution. Ultrasound for 15 minutes to disperse evenly, and stir for 8 to 12 hours. 5mL of 70-85% hydrazine hydrate solution was added dropwise to the stirred homogenate, stirred for 15 minutes, and then transferred to a hydrothermal reaction kettle with a polytetrafluoroethylene liner. Reaction at 160℃~180℃ for 10~14 hours

[0021] (2) The product obtained by the hydrothermal reaction is repeatedly washed with water and filtered until the filtrate is neutral (PH test paper detection), and then the washed product is dried in a vacuum freeze dryer for at least 24 hours to completely dehydrate

[0022] (3) At a heating rate of 5 °C / min, the temperature was raised to 450 °C under the protection of flowing nitrogen, and the dried product was annealed for 2.5...

Embodiment 2

[0024] (1) Add 15 mL of 5 mg / mL graphene oxide solution obtained by the Hummers method into 60 mL of deionized water for dilution, and disperse evenly by ultrasonication for 30 min. Then add 5 mL of 2.3 mg / mL RuCl 3 ·3H 2 O aqueous solution. Ultrasound for 15 minutes to disperse evenly, and stir for 8 to 12 hours. 5mL of 70-85% hydrazine hydrate solution was added dropwise to the stirred homogenate, stirred for 15 minutes, and then transferred to a hydrothermal reaction kettle with a polytetrafluoroethylene liner. Reaction at 160℃~180℃ for 10~14 hours

[0025] (2) The product obtained by the hydrothermal reaction is repeatedly washed with water and filtered until the filtrate is neutral (PH test paper detection), and then the washed product is dried in a vacuum freeze dryer for at least 24 hours to completely dehydrate

[0026](3) At a heating rate of 5 °C / min, the temperature was raised to 400 °C under the protection of flowing nitrogen, and the dried product was annealed...

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Abstract

The invention relates to a preparation method of a low-polarization lithium-air battery cathode catalyst material, belonging to the field of electrochemical technology. The method has simple synthesis process and high production efficiency, and the introduction of the synchronous method greatly improves the dispersion of precious metals on the surface of carbon materials, reduces the amount of precious metals, and is beneficial to control cost and scale production. Moreover, the method of the invention is simple to operate, the reaction conditions are easy to control, and the result repeatability is good. The low-polarization lithium-air battery cathode catalyst material prepared by the method has low cost, good chemical stability, large specific surface area, high catalytic activity, and the assembled battery has high specific capacity, low polarization and good rate performance. Compared with pure carbon material catalysts, the catalytic efficiency is remarkable, the battery overpotential is low, the specific capacity is increased by 8 times, and the rate and cycle performance are significantly improved.

Description

technical field [0001] The invention relates to a preparation method of a low polarization lithium-air battery positive electrode catalytic material, in particular to a preparation method of a low polarization, high rate performance, and high stability lithium-air battery positive electrode catalytic material, which belongs to the field of electrochemical technology . Background technique [0002] With the development of modern human society, energy and environmental issues have become increasingly severe, and have become important obstacles to the development of modern science and technology and the improvement of human living standards. Most of the existing energy systems are dominated by petrochemical energy. However, with the gradual depletion of petrochemical energy and the use of fossil fuels, climate problems are becoming more and more serious. Therefore, it is of great significance to develop and use efficient and clean new energy sources to gradually replace tradit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M12/08
CPCH01M4/926H01M12/08Y02E60/10
Inventor 刘向峰高睿胡中波
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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