Double-perovskite structure catalyst material for cathode of lithium air battery and preparation method of catalyst material

A structural catalyst, lithium-air battery technology, applied in battery electrodes, structural parts, fuel cell-type half-cells and primary battery-type half-cells, etc., to achieve the effects of increased discharge voltage, good repeatability, and good performance

Inactive Publication Date: 2014-01-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of double perovskite catalysts for lithium-air battery cathodes has not been reported so far.

Method used

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  • Double-perovskite structure catalyst material for cathode of lithium air battery and preparation method of catalyst material
  • Double-perovskite structure catalyst material for cathode of lithium air battery and preparation method of catalyst material
  • Double-perovskite structure catalyst material for cathode of lithium air battery and preparation method of catalyst material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Sr 2 CrMoO 6 (a)

[0030] Weigh 4.23g Sr(NO 3 ) 2 , 1.77g (NH 4 )6Mo 7 o 24 4H 2 O and 4.00g Cr(NO 3 ) 3 9H 2 O was dissolved in 100ml of deionized water; 12.61g of citric acid and 11.69g of ethylenediaminetetraacetic acid were added; then evaporated and concentrated at 65°C for 12h to obtain a gel; the obtained gel was dried at 250°C for 6h in an air atmosphere to obtain a xerogel; Grind the xerogel into a powder, and bake it at 800°C for 6 hours in an air atmosphere; the obtained powder is pressed at 300 MPa for 5 minutes; finally, it is heated in 5% H 2 / 95% Ar atmosphere and calcined at 1200°C for 24h to prepare the catalyst. In conjunction with the literature Journal of Solid State Chemistry 155 (2000) 233-237, it can be judged that the obtained material is a pure-phase double perovskite structure (attached figure 1 ). attached by figure 2 It can be seen from the scanning electron microscope image of the obtained material that the material ...

Embodiment 2

[0031] Example 2: Ca 2 CrMoO 6

[0032] Weigh 4.72g Ca㈩O 3 ) 2 4H 2 O, 1.77g (NH 4 ) 6 Mo 7 o 24 4H 2 O and 4.00gCr(NO 3 ) 3 9H 2 O was dissolved in 100ml of deionized water; 12.61g of citric acid and 1.69g of ethylenediaminetetraacetic acid were added; then evaporated and concentrated at 65°C for 4h to obtain a gel; the obtained gel was dried at 200°C for 12h in an air atmosphere to obtain a xerogel The obtained xerogel was ground into powder and calcined at 500°C for 12h in an air atmosphere; the obtained powder was pressed into tablets at 300MPa for 15min; finally, the catalyst was obtained by calcining at 1200°C for 24h in an atmosphere of 15% H2 / 85% Ar.

Embodiment 3

[0033] Example 3: Ba 2 CrMoO 6

[0034] Weigh 5.23g Ba(NO 3 ) 2 , 1.77g (NH 4 ) 6 Mo 7 o 24 4H 2 O and 4.00g Cr㈩O 3 ) 3 9H 2 O was dissolved in 100ml of deionized water; 12.61g of citric acid and 11.69g of ethylenediaminetetraacetic acid were added; then evaporated and concentrated at 65°C for 1h to obtain a gel; the obtained gel was dried in an air atmosphere at 250°C for 6h to obtain a xerogel; The xerogel was ground into powder and calcined at 1000°C for 1 h in an air atmosphere; the obtained powder was pressed into tablets at 300 MPa for 20 min; and finally calcined at 800°C for 12 h in a 30% H2 / 70% Ar atmosphere to obtain a catalyst.

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Abstract

The invention relates to a double-perovskite structure catalyst material for a cathode of a lithium air battery and a preparation method of the catalyst material. The molecular formula of the catalyst material is AxA'(2-x)CryMo(2-y)O6, wherein A is one of Sr, Ca or Ba; A' is one of Sr, Ca, Ba, La, Ce, Pr, Nd, Sm, Eu or Gd; x is greater than 1 and less than 2; y is greater than 0 and less than 2. The preparation method comprises the following steps: obtaining xerogel by a sol-gel method; performing one-step or multi-step presintering on the obtained xerogel in an air atmosphere to obtain solid powder; and tableting the obtained solid powder, and roasting in a reducing atmosphere to obtain the double-perovskite structure material. Compared with the prior art, the catalyst disclosed by the invention is a single pure phase with stable physicochemical property; the preparation method is simple with good repeatability. The catalyst for a cathode of the lithium air battery has the advantages that the specific capacity of the battery is increased and the energy conversion efficiency of the battery is effectively improved. Moreover, the lithium air battery assembled by use of the material has a good cycle life.

Description

technical field [0001] The invention belongs to the field of lithium-air batteries, and in particular relates to a catalyst material with a double perovskite structure for a cathode and a preparation method thereof. Background technique [0002] Lithium Air Batteries (Liair Batteries) is an energy storage and conversion device that uses lithium metal as the negative electrode active material and oxygen in the air as the positive electrode active material. Its theoretical energy density is as high as 11680Wh.kg -1 (Journal ofThe Electrochemical Society, 143(1996)1-5), and the theoretical energy density of the gasoline used to drive the car at present is 13000Wh·kg -1 quite. At present, the actual energy density of gasoline used in automobiles is about 1700Wh·kg -1 , so the energy utilization rate of lithium-air batteries can be comparable with it as long as it reaches 14.5%. With reference to the more mature metal-air batteries at present, such as zinc-air batteries, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCY02E60/50H01M4/9016H01M12/06
Inventor 马忠原鲜霞殷洁炜马紫峰
Owner SHANGHAI JIAO TONG UNIV
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