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Catalytic agent for lithium-air battery cathode and preparation method

A lithium-air battery and catalyst technology, applied in the direction of battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of strong implementability, increased specific surface area, and improved catalytic efficiency

Inactive Publication Date: 2013-06-19
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a catalyst capable of increasing the oxygen reduction reaction speed, reducing overvoltage, and improving the performance of lithium-air batteries, and also provide a low-cost, simple-to-operate, and non-polluting preparation method for the above-mentioned catalyst, so as to meet the current needs of customers. There are technical deficiencies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 0.5mmol KMnO to the 50mL reactor 4 , 0.5 mmol NH 4 C1, 30mL deionized water, and 10mg MOFs were stirred for 10min, then placed in an oven, reacted at 140°C for 8h, then centrifuged, filtered, washed repeatedly with deionized water and absolute ethanol, and finally heated at 80°C After drying for 12 hours, a catalyst sample was obtained.

Embodiment 2

[0019] Add 0.7mmol KMnO to the 50mL reactor 4 , 0.7 mmol MnSO 4 and 35mL deionized water, and 20mg MOFs, stirred for 10min, then placed in an oven, reacted at 180°C for 24h, then centrifuged, filtered, washed repeatedly with deionized water and absolute ethanol, and finally dried at 150°C 12h, the catalyst sample was obtained.

Embodiment 3

[0021] Add 0.9mmol KMnO to the 50mL reactor 4 , 0.9mmol HC1 and 35mL deionized water, and 37mg MOFs, stirred for 10min, then placed in an oven, reacted at 160°C for 72h, then centrifuged, filtered, and washed repeatedly with deionized water and absolute ethanol, and finally Dry at 130°C for 24 hours to obtain a catalyst sample.

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Abstract

The invention discloses a catalytic agent for a lithium-air battery cathode and a preparation method. The catalytic agent comprises a nano-manganese dioxide active component and a metal-organic frameworks (MOFs) carrier, and a molar ratio of the MOFs to the nano-manganese oxide is 5: 1-30: 1. The nano-manganese oxide is deposited on the surface of the MOFs material through a hydrothermal method or a redox process, so that the catalytic agent is prepared to be used on the lithium-air battery cathode. The catalytic agent has very good catalytic activity, the overvoltage of a battery is reduced, and therefore the charge-discharge efficiency of the lithium-air battery is improved. In addition, the preparation method of the catalytic agent is simple, practicable and pollution-free. Complex and strict reaction conditions do not need to be adopted.

Description

technical field [0001] The invention belongs to the field of lithium-air batteries, and in particular relates to a catalyst and a preparation method for lithium-air battery cathodes. Background technique [0002] Theoretically, since the oxygen in the air is not limited as the positive electrode reactant of the lithium-air battery, the capacity of the lithium-air battery only depends on the lithium electrode, and its specific energy is 5.21kWh / kg (including oxygen mass), or 11.14kWh / kg ( Excluding oxygen mass), it is more than 10 times that of current lithium-ion batteries. In addition, compared with other metal-air batteries, lithium-air batteries have higher specific energy, and lithium-air batteries are non-polluting. Therefore, in recent years, lithium-air batteries have attracted more and more researchers' attention. However, the oxygen reduction reaction of the positive electrode of the lithium-air battery is a slow reaction. Due to the limitation of the current cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J31/32
CPCY02E60/50
Inventor 银凤翔陈标华李国儒
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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