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A kind of secondary lithium-air battery cathode catalyst and its application

A cathode catalyst, lithium-air battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as not fully utilizing the advantages of transition metal catalytic materials, poor conductivity of transition metal oxides, and inability to exert electrocatalytic performance. , to achieve the effect of excellent catalytic efficiency, reduced production cost and long cycle life

Active Publication Date: 2015-12-02
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; Stable electrocatalytic performance, which limits the application of this type of catalyst in lithium-air batteries, does not give full play to the advantages of transition metal catalytic materials

Method used

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  • A kind of secondary lithium-air battery cathode catalyst and its application
  • A kind of secondary lithium-air battery cathode catalyst and its application
  • A kind of secondary lithium-air battery cathode catalyst and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: Co-precipitation method prepares MnFe 0.2 co 1.8 o 4

[0044] Weigh 0.0012molC according to the stoichiometric ratio 4 h 6 MnO 4 4H 2 O,0.00024molFe(NO 3 ) 3 9H 2 O,0.00216molCo(NO 3 ) 2 ·6H 2 O was dissolved in 500ml of deionized water, then 0.72mol of urea was added, sealed, magnetically stirred and kept at 75°C for 24h, after the black precipitate was obtained, it was centrifuged and washed several times with deionized water, then placed in an oven, kept at 75°C and all The water evaporates. Finally, the black precipitate is calcined at 600°C for 3 hours to obtain a black powder that is MnFe 0.2 co 1.8 o 4 .

[0045] Prepare a button battery and test it, first discharge it to 2.0V at 30mA / g, then charge it to 4.2V, the released capacity is expressed as MnFe 0.2 co 1.8 o 4 Calculated with the total mass of acetylene black, it reaches 3335mAhg -1 ; And the charging potential is 3.53~3.75V, and the discharging potential is 2.00~2.84V. ...

Embodiment 2

[0047] Embodiment 2: Co-precipitation method prepares Mn 0.8 Fe 0.2 co 2 o 4

[0048] Weigh 0.00096molC according to the stoichiometric ratio 4 h 6 MnO 4 4H 2 O,0.00024molFe(NO 3 ) 3 9H 2 O,0.0024molCo(NO 3 ) 2 ·6H 2 O was dissolved in 500ml of deionized water, then 0.72mol of urea was added, sealed, magnetically stirred and kept at 75°C for 24h, after the black precipitate was obtained, it was centrifuged and washed several times with deionized water, then placed in an oven, kept at 75°C and all The water evaporates. Finally, the black precipitate is calcined at 550°C for 3 hours to obtain a black powder which is Mn 0.8 Fe 0.2 co 2 o 4 .

Embodiment 3

[0049] Embodiment 3: Co-precipitation method prepares MnCu 0.2 co 1.8 o 4

[0050] Weigh 0.0012molC according to the stoichiometric ratio 4 h 6 MnO 4 4H 2 O,0.00024molCu(NO 3 ) 2 ·3H 2 O,0.00216molCo(NO 3 ) 2 ·6H 2 O was dissolved in 500ml of deionized water, then 0.72mol of urea was added, sealed, magnetically stirred and kept at 75°C for 24h, after the black precipitate was obtained, it was centrifuged and washed several times with deionized water, then placed in an oven, kept at 75°C and all The water evaporates. Finally, the black precipitate is roasted at 600°C for 5 hours to obtain a black powder that is MnCu 0.2 co 1.8 o 4 .

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Abstract

The invention discloses a secondary lithium-air battery cathode catalyst and application thereof. The catalyst belongs to a spinel crystal structure, and the structural formula of the catalyst is AxB1-xC2O4 or ABxC2-xO4, wherein x is greater than 0 and is less than 1; A is Mn, Co, Fe or Ni; B is a transition metal element; C is Co, Mn, Ni or Fe; in the catalyst, A, B and C are different elements. The secondary lithium-air battery cathode catalyst has bifunctional property, can obviously reduce the charge and discharge polarization of the battery and obtains high charge and discharge capacity, superior charge and discharge rate and long cycle life; the production cost can be obviously reduced; meanwhile, the catalyst has superior catalytic efficiency. A secondary lithium-air battery comprising catalyst has the advantage of high energy density and is applicable to the fields 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): H01M4/90
CPCY02E60/50
Inventor 杨瑞枝曹学成
Owner SUZHOU UNIV
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