Secondary lithium-air battery cathode catalyst

A cathode catalyst, air battery technology, applied in battery electrodes, fuel cell type half cells and secondary battery type half cells, circuits, etc., can solve the problem that transition metal oxides have poor conductivity, are easily terminated, cannot be Take advantage of electrocatalytic performance and other issues to achieve the effects of excellent catalytic efficiency, reduced production costs, and long cycle life

Active Publication Date: 2015-04-22
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When transition metal oxides are used as electrocatalysts, their lithium-air batteries have the characteristics of high discharge capacity, good cycle performance, and good electrocatalytic performance, but the conductivity of transition metal oxides is not good, the reaction is easily terminated, and cannot play Stable electrocatalytic performance

Method used

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  • Secondary lithium-air battery cathode catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Preparation of P and Co co-doped porous carbon

[0035] Weigh resorcinol and formaldehyde, mix, the molar ratio of resorcinol and formaldehyde is 1: 2, and add 50ml deionized water, vigorously stir to form a homogeneous solution, then add Co(NO 3 ) 2 ·6H 2 O, make the molar ratio of resorcinol and Co 1:20, and stir to dissolve; then add ammonia water dropwise to make the solution form a sol.

[0036] The above sol was dried in a vacuum oven at 85° C. for 7 days to form a gel; the gel was heat-treated in a tube furnace at 1000° C. for 2 h under an Ar atmosphere to obtain Co-doped porous carbon. Phosphoric acid was added to the obtained Co-doped carbon, so that the mass ratio of carbon to phosphoric acid was 1:10, and impregnated at 80 °C for 2 h, then the phosphoric acid and carbon were separated, and the obtained carbon material was heated in a tube furnace under an Ar atmosphere. Heating at 800°C for 1 h, then cooling to room temperature naturally, P and ...

Embodiment 2

[0042] Example 2: Preparation of P and Fe co-doped porous carbon

[0043] Put 1M sucrose solution into an autoclave with a volume of 100ml and seal it with a filling degree of 70 v%, heat the autoclave in an oven at 220°C for 12 hours to obtain a carbon intermediate; weigh the carbon intermediate and add 0.1M Ferric chloride solution, so that the molar ratio of Fe and carbon intermediates is 0.01:1, soak for 3 hours, then dry at 100°C; then add phosphoric acid, make the mass ratio of carbon and phosphoric acid 1:16, soak for 3 hours at 80°C , and then the phosphoric acid was separated from the carbon, and the resulting carbon material was heated in a tube furnace at 900 °C for 2 h in an Ar atmosphere to obtain P and Fe co-doped porous carbon. The molar ratio of carbon is 3:97, and the molar ratio of P and Fe is 2:1.

[0044] A button battery was prepared and tested. First, it was discharged to 2.0V at 30mA / g, and then charged to 4.2V. The released capacity was calculated base...

Embodiment 3

[0045] Example 3: Preparation of P, Fe and Co co-doped porous carbon

[0046] Weigh resorcinol and formaldehyde and mix, so that the molar ratio of resorcinol and formaldehyde is 1:2, and add 100 ml deionized water, stir vigorously to form a homogeneous solution, then add Co(NO 3 ) 2 ·6H 2 O and ferric chloride, make the molar ratio of Fe and Co 1:1~3, preferably 1:3, make the molar ratio of resorcinol and Co 1:15, stir and dissolve; then add ammonia water drop by drop , so that the solution forms a sol.

[0047] The above sol was dried in a vacuum oven at 85°C for 10 days to form a gel, which was heat-treated in a tube furnace at 1000°C for 3 h under an Ar atmosphere to obtain Co and Fe co-doped porous carbon. Phosphoric acid was added to the obtained Co and Fe co-doped carbon, so that the mass ratio of carbon to phosphoric acid was 1:12, and immersed at 80 ° C for 3 h, then the phosphoric acid and carbon were separated, and the obtained carbon material was heated in a tub...

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Abstract

The invention discloses a secondary lithium-air battery cathode catalyst. The catalyst is a carbon material doped with exotic atoms, wherein the exotic atoms are phosphorus and a transition metal element; the carbon material is a porous carbon, graphene or carbon nano-tube; the molar ratio of the exotic atoms to the carbon material is 1:(19-99); and the molar ratio of phosphorus to the transition metal element in the exotic atoms is (1-4):1. The secondary lithium-air battery cathode catalyst has double-function property, can significantly reduce battery charge and discharge polarization, achieves high charge and discharge capacity, excellent charge and discharge magnification and long cycle life, can obviously reduce the production cost, and at the same time has excellent catalytic efficiency. A secondary lithium-air battery containing the catalyst has the advantage of high energy density, and is applicable to the field of various mobile electronic equipment and electric batteries.

Description

technical field [0001] The invention relates to a battery material, in particular to a cathode catalyst for a secondary lithium-air battery, and belongs to the field of electrocatalysts for high-performance chemical power sources. Background technique [0002] Due to the rapid development of space technology, mobile communications, missiles, aerospace and other fields, as well as modern people's concern about energy crisis and environmental protection, the research and development of high energy storage batteries have attracted widespread attention. Since lithium has the smallest mass and the lowest electrode potential among all metal elements, batteries composed of lithium have the characteristics of high open circuit voltage and large mass specific capacity. In recent years, they have rapidly replaced nickel-cadmium and nickel-hydrogen batteries and become the most popular high-energy battery. Battery. [0003] The secondary lithium-air battery is a battery that uses oxyg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M12/08
CPCY02E60/50Y02E60/10
Inventor 杨瑞枝吴娇杨振荣
Owner SUZHOU UNIV
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