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Three-dimensional porous perovskite catalyst La<x>Sr(1-x)Co<y>Fe<1-y>O<3> and preparation method thereof

A three-dimensional porous, perovskite-type technology, used in fuel cell-type half-cells and secondary battery-type half-cells, structural parts, electrical components, etc. High potential, poor cycle performance, etc., to achieve good electrical conductivity and ionic conductivity, improve capacity and cycle stability, and low cost.

Inactive Publication Date: 2016-06-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Perovskite oxide La x Sr 1-x co y Fe 1-y o 3 The traditional preparation methods are solid phase reaction method, co-precipitation method, sol-gel method, etc. The powders prepared by traditional methods are mostly granular, with a specific surface area of ​​10m 2 Below / g, using the above-mentioned perovskite oxide with low specific surface area and granular structure as the cathode catalyst of lithium-air battery is not conducive to + and oxygen transport, the overpotential of lithium-air batteries is still too high, and the cycle performance is poor
Therefore, perovskite oxides prepared by traditional methods do not meet the needs of lithium-air batteries for cathode materials.

Method used

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  • Three-dimensional porous perovskite catalyst La&lt;x&gt;Sr(1-x)Co&lt;y&gt;Fe&lt;1-y&gt;O&lt;3&gt; and preparation method thereof
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  • Three-dimensional porous perovskite catalyst La&lt;x&gt;Sr(1-x)Co&lt;y&gt;Fe&lt;1-y&gt;O&lt;3&gt; and preparation method thereof

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preparation example Construction

[0032] The preparation method of the three-dimensional porous perovskite catalyst of the present invention is described and illustrated in detail below, and the preparation method specifically includes the following steps:

[0033] 1) La(NO 3 ) 2 ·6H 2 O, Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O The four nitrates are weighed according to the molar ratio x:1-x:y:1-y, then dissolved in a certain amount of methanol and ethylene glycol mixed solution, stirred at a constant temperature of 20-30°C until the nitric acid The salt is all dissolved and mixed well to obtain a nitrate solution. As a preferred embodiment, the volume ratio of methanol to ethanol is 1:1, and the total concentration of the nitrate solution is 1 to 2 mol L -1 .

[0034] 2) Soak the PS microsphere (polystyrene microsphere) template in the above nitrate solution, wherein the PS microsphere template is prepared by the microsolution method and then self-assembled by centrifugation. The par...

Embodiment 1

[0042] Prepare PS microsphere template:

[0043] Dissolve 0.065g of sodium dodecylbenzenesulfonate and 0.0489g of potassium persulfate in a mixed solution of 20ml of distilled water and 50ml of ethanol, and place them in a 250ml three-neck flask after dissolving; add about 3ml of styrene to the solution, Access to N 2 The atmosphere was stirred at a constant temperature of 70°C for 6.5 hours; after the stirring was completed, the temperature was lowered, and the mixed solution was transferred to a centrifuge tube for centrifugal washing at a centrifugal rate of 2000r / min for 16 hours, the washing liquid was ethanol, and the number of washings was 3 times; After drying in a freeze-drying oven for 5 hours, orderly arranged polystyrene microsphere templates were obtained.

[0044] Preparation of perovskite catalyst La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3 :

[0045] La(NO 3 ) 2 ·6H 2 O, Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O four kinds of nitrates weighed ...

Embodiment 2

[0047] The LSCF material in Example 1 is used as the cathode catalyst of the non-aqueous lithium-air battery, that is, the LSCF is mixed with the carbon material SuperP and the binder to make a slurry, and the cathode electrode sheet is made on the carbon paper by screen printing , and then assemble the electrode sheet into a battery for testing. In the test, when preparing the cathode slurry, the ratio of the powder to the binder PVDF (polyvinylidenefluoride) was 90:10, and the mass ratio of the catalyst LSCF to the carbon powder SuperP in the powder was 35:55. Specifically include the following steps:

[0048] PVDF is first dissolved in NMP (N-methyl-2-pyrrolidone, N-methyl-2-pyrrolidone) solvent, and then the catalyst LSCF and carbon powder SuperP powder are weighed according to the stated ratio, and the powder and binder PVDF are placed on the agate Grind in a mortar, add an appropriate amount of NMP dropwise, and grind for about 2.5 hours to obtain a uniform slurry; use ...

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Abstract

The invention discloses a three-dimensional porous perovskite catalyst La<x>Sr(1-x)Co<y>Fe<1-y>O<3> and a preparation method thereof. The catalyst is an anode catalyst for a lithium-air battery; the specific surface area is 20-30m<2> / g; a three-dimensional porous channel is formed in the catalyst; the porous channel provides a transmission channel for ions and gases; and a storage space is provided for a reaction product. The method comprises the following steps: weighing four nitrates at a certain ratio, dissolving the four nitrates into a mixed solution of methanol and ethylene glycol, and stirring and mixing the solution evenly to obtain a nitrate solution; soaking a PS microsphere template into the nitrate solution; and taking out and drying the PS microsphere template soaked with the nitrate solution, carrying out burning to burn off the template and obtaining the required catalyst. The catalyst can meet the requirements of an anode material for the lithium-air battery, has the advantages of being simple in preparation technology, convenient to operate, low in cost, free of pollution and the like, and can achieve large-scale production.

Description

technical field [0001] The invention belongs to the field of battery catalyst preparation, and more specifically relates to a three-dimensional porous perovskite catalyst La x Sr 1-x co y Fe 1-y o 3 and its preparation method. Background technique [0002] A lithium-air battery is a battery that uses lithium as the anode and oxygen in the air as the cathode reactant. It has a theoretical energy density very close to the combustion value of gasoline and is considered to be the most promising power battery for future electric vehicles. The non-aqueous lithium-air battery has a higher energy density and has become a research hotspot. It is mainly composed of a porous air electrode, a polymer diaphragm (loaded with organic electrolyte), and a lithium metal anode. Its working principle is: during the discharge process, the anode After lithium releases electrons, it becomes a lithium cation (Li + ), Li + Through the lithium-ion electrolyte material, the air cathode combines...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M12/08
CPCH01M4/88H01M4/9016H01M12/08Y02E60/10
Inventor 李箭程俊芳池波蒲健李昕宇蒋越星邹璐张明
Owner HUAZHONG UNIV OF SCI & TECH
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