Method for preparing LMO-YSZ composite solid electrolyte by microwave combustion supporting method

A LMO-YSZ, solid electrolyte technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of corrosion, slow decomposition of materials, interphase diffusion of metal connection materials, etc., to achieve energy saving, simple operation, and short synthesis time. Effect

Active Publication Date: 2019-06-28
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, YSZ-based solid electrolyte materials operate at higher temperatures (usually around 1000°C). At 1000°C, their electrical conductivity is higher, but it also brings some problems, such as slow decomposition of materials, interphase diffusion and metal connection. Corrosion of materials, etc.
In addition, at around 800°C, the O 2- The conductivity is still low compared with other types of solid electrolyte materials

Method used

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  • Method for preparing LMO-YSZ composite solid electrolyte by microwave combustion supporting method
  • Method for preparing LMO-YSZ composite solid electrolyte by microwave combustion supporting method
  • Method for preparing LMO-YSZ composite solid electrolyte by microwave combustion supporting method

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Effect test

Embodiment 1

[0026] The method for preparing LMO-YSZ composite solid electrolyte by microwave combustion-supporting method, the steps are as follows:

[0027] 1), according to La 2 Mo 2 o 9Weigh lanthanum nitrate and ammonium molybdate, add an appropriate amount of water according to the concentration requirement of 0.25mol / L, then add citric acid, stir and dissolve at 70°C with magnetic force, and adjust the pH value of the solution to neutral with ammonia water; then put Put it into a microwave oven, microwave combustion-supporting reaction at 300°C for 10min, the reaction product was washed, oven-dried at 120°C for 2h, and ground to obtain LMO. Preparation of Lanthanum Molybdate La by Microwave Combustion 2 Mo 2 o 9 That is, LMO, and then zirconium nitrate and yttrium nitrate are prepared by microwave combustion method to prepare yttrium-based zirconia Zr 0.92 Y 0.08 o 1.96 That is, YSZ, and finally LMO-YSZ composite solid electrolyte was obtained by ball milling and mixing.

...

Embodiment 2

[0039] The method for preparing LMO-YSZ composite solid electrolyte by microwave combustion-supporting method, the steps are as follows:

[0040] 1), according to La 2 Mo 2 o 9 Weigh lanthanum nitrate and ammonium molybdate, add appropriate amount of water according to the concentration requirement of 0.2mol / L, then add citric acid, stir and dissolve at 80°C, and adjust the pH value of the solution to neutral with ammonia water; then put Put it into a microwave oven, microwave combustion-supporting reaction at 280°C for 15min, the reaction product was washed, oven-dried at 100°C for 3h, and ground to obtain LMO.

[0041] 2), according to Zr 0.92 Y 0.08 o 1.96 Weigh zirconium nitrate and yttrium nitrate, add appropriate amount of water according to the concentration requirement of 0.35mol / L, then add citric acid, stir and dissolve at 55°C, and adjust the pH value of the solution to neutral with ammonia water; then add In a microwave oven, microwave combustion-supporting r...

Embodiment 3

[0045] The method for preparing LMO-YSZ composite solid electrolyte by microwave combustion-supporting method, the steps are as follows:

[0046] 1), according to La 2 Mo 2 o 9 Weigh lanthanum nitrate and ammonium molybdate, add appropriate amount of water according to the concentration requirement of 0.3mol / L, then add citric acid, stir and dissolve at 60°C with magnetic force, and adjust the pH value of the solution to neutral with ammonia water; then put Put it into a microwave oven, microwave combustion-supporting reaction at 320°C for 5 minutes, the reaction product was washed, oven-dried at 140°C for 1 hour, and ground to obtain LMO.

[0047] 2), according to Zr 0.92 Y 0.08 o 1.96 Weigh zirconium nitrate and yttrium nitrate, add appropriate amount of water according to the concentration requirement of 0.15mol / L, then add citric acid, stir and dissolve at 85°C, and adjust the pH value of the solution to neutral with ammonia water; then add In a microwave oven, micro...

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Abstract

The invention provides a method for preparing LMO-YSZ composite solid electrolyte by a microwave combustion supporting method, and relates to the technical field of solid electrolyte ceramic materialpreparation. The method comprises the following steps: firstly, preparing lanthanum molybdate LMO from lanthanum nitrate and ammonium molybdate by a microwave combustion supporting method; then, preparing yttrium-based zirconia YSZ from zirconium nitrate and yttrium nitrate by the microwave combustion supporting method; and finally preparing the LMO-YSZ composite solid electrolyte by ball-millingand mixing. The LMO-YSZ composite electrolyte prepared by adopting the microwave combustion supporting method has good sintering performance in a product tablet sintered at 900 DEG C, and the porosityis less than 5.5 percent; along with constant increasing of LMO proportion, the oxygen ion conductivity shows a trend of gradually increasing, and when the temperature is 800 DEG C, the sample of LMO-YSZ=(6:4) has a maximized conductivity which is 0.0199S / cm and the activation energy of 1.232eV.

Description

technical field [0001] The invention relates to the technical field of preparation of solid electrolyte ceramic materials, in particular to a method for preparing LMO-YSZ composite solid electrolyte by a microwave combustion-supporting method. Background technique [0002] In the past ten years, since the oxygen ion conductor lanthanum molybdate does not have any ion doping, there will be a large number of oxygen vacancies inside the system, and the conductivity of oxygen ions is relatively high under certain conditions and the system It is relatively stable and has a low operating temperature, which has attracted extensive attention from scholars studying hydrogen energy solid oxide fuel cell materials. However La 2 Mo 2 o 9 There is a phase transition point (about 580°C) which greatly limits its application. Much research work has focused on La 2 Mo 2 o 9 Doping at different positions can inhibit the occurrence of phase transition and further improve its electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/48C04B35/622C04B35/626H01M8/1253H01M8/1246
CPCY02E60/50Y02P70/50
Inventor 阳杰李虎威孟俊杰项丽云李世定王珍珍程秋冉郜奥迪高豹王勃杨永平
Owner HEFEI UNIV
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