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Preparation method of low polarization lithium-air battery cathode catalytic material

A technology of air batteries and catalytic materials, applied in the field of electrochemistry, can solve the problems of large-scale commercialization of catalysts, high cost, and high price, and achieve the effects of controlling cost and large-scale production, good repeatability of results, and low cost

Active Publication Date: 2017-06-13
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 low polarization lithium-air battery cathode catalytic material
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  • Preparation method of low polarization lithium-air battery cathode catalytic 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 catalytic material and belongs to the technical field of electrochemistry. The preparation method has the advantages that synthesis technology is simple, production efficiency is high, introduction of a synchronization method greatly improves dispersibility of precious metal on the surface of a carbon material, usage amount of the precious metal is reduced, and cost control and mass production are facilitated; meanwhile, the preparation method is simple to operate, reaction conditions are easy to control, and result repeatability is good; and the low polarization lithium-air battery cathode catalytic material prepared by utilizing the preparation method provided by the invention is low in cost, good in chemical stability, large in specific surface area and high in catalytic activity, and an assembled battery is high in specific capacity, low in polarization and good in rate performance; and compared with a pure carbon material catalyst, catalytic efficiency is obvious, battery overpotential is low, specific capacity is improved for eight times, and rate and cycle performances are also obviously 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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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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