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SDC-LSO composite electrolyte and preparation method thereof

A composite electrolyte and mixed solution technology, applied in circuits, fuel cells, electrical components, etc., can solve problems such as difficult sintering, narrow operating temperature range, and reduced SOFCs efficiency, and achieve easy industrial production, simple preparation methods, and high sintering activity. Effect

Inactive Publication Date: 2019-08-27
盐城市新能源化学储能与动力电源研究中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the research on SOFCs composite electrolytes in the literature mainly focuses on CeO 2 based composite electrolyte, however, CeO 2 The base electrolyte also has obvious disadvantages: CeO 2 Narrow working temperature range, unstable under low oxygen partial pressure and reducing atmosphere, Ce 4+ Easily reduced to Ce 3+ , the electronic conductance appears, which makes the internal short circuit of the battery and reduces the efficiency of SOFCs, Ce 4+ reduced to Ce 3+ When CeO 2 Lattice expansion, easy to crack, difficult to sinter

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  • SDC-LSO composite electrolyte and preparation method thereof

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Embodiment 1

[0027] In this embodiment, a method for preparing an SDC-LSO composite electrolyte mainly includes:

[0028] A. Dissolve 0.5mol of lanthanum nitrate in a mixed solution of 40ml of ethanol and water, wherein the volume ratio of ethanol to water is 1:1, form a clear and transparent solution by magnetic stirring at room temperature, and then mix orthosilicic acid according to the LSO metering ratio Tetraethyl orthosilicate and acetic acid are added in the above-mentioned transparent solution, the molar ratio of specifically described tetraethyl orthosilicate and described lanthanum nitrate is 9.33:6, add the tetraethyl orthosilicate of 0.7775mol in the present embodiment, through Magnetic stirring at room temperature forms a transparent viscous sol, which turns into a gel after being treated in a water bath at 80°C for 3 hours. Ultrasonic disperse the wet gel in 50ml of 1,4-butanediol and water mixed solution (the volume ratio of 1,4-butanediol to water is 1:1), add 0.5mol of KOH...

Embodiment 2

[0033] In this embodiment, a method for preparing an SDC-LSO composite electrolyte mainly includes:

[0034] A. Dissolve 0.5mol of lanthanum nitrate in a mixed solution of 40ml of ethanol and water, wherein the volume ratio of ethanol to water is 1:3, form a clear and transparent solution by magnetic stirring at room temperature, and then mix orthosilicic acid according to the LSO metering ratio Tetraethyl ester and acetic acid were added to the above transparent solution, and a transparent viscous sol was formed by magnetic stirring at room temperature, and the sol was transformed into a gel after being treated in a water bath at 80°C for 4 hours. Ultrasonic disperse the wet gel in 50ml of 1,4-butanediol and water mixed solution (the volume ratio of 1,4-butanediol to water is 3:1), add 0.3mol of KOH under the condition of stirring, and then Transfer to a polytetrafluoroethylene autoclave. Then it was sealed and placed in an oil bath with a set temperature of 240° C. for 20 h...

Embodiment 3

[0040] In this embodiment, a method for preparing an SDC-LSO composite electrolyte mainly includes:

[0041] A. Dissolve 0.5mol of lanthanum nitrate in a mixed solution of 40ml of ethanol and water, wherein the volume ratio of ethanol to water is 3:1, form a clear and transparent solution by magnetic stirring at room temperature, and then add orthosilicic acid according to the LSO metering ratio Tetraethyl ester and acetic acid were added to the above transparent solution, and magnetically stirred at room temperature to form a transparent viscous sol, which was transformed into a gel after being treated in a water bath at 80°C for 2 hours. Ultrasonic disperse the wet gel in 50ml of 1,4-butanediol and water mixed solution (the volume ratio of 1,4-butanediol to water is 4:1), add 0.2mol of KOH under the condition of stirring, and then Transfer to a polytetrafluoroethylene autoclave. Then it was sealed and placed in an oil bath with a set temperature of 280° C. for 12 hours. Af...

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Abstract

The invention belongs to the field of solid electrolytes, and in particular relates to an SDC-LSO composite electrolyte and a preparation method thereof. A lanthanum salt, tetraethyl orthosilicate, acetic acid and 1,4-butanediol are used as raw materials for preparing apatite-type LSO nanopowder by a solvothermal method; the LSO nanopowder and SDC nanopowder are mixed and dispersed; heating and degreasing are performed; and heating is performed to carry out calcining for a certain time so as to obtain the SDC-LSO composite electrolyte. The nanocomposite electrolyte powder has high sintering activity, and is relatively low in sintering temperature and relatively high in conductivity; and the preparation method is simple and easy for industrial production.

Description

technical field [0001] The invention belongs to the field of solid electrolytes, in particular to an SDC-LSO composite electrolyte and a preparation method thereof. Background technique [0002] Solid oxide fuel cells (Solid Oxide Fuel Cells, SOFCs) are a new type of energy conversion device, which has the advantages of high energy conversion efficiency, less environmental pollution, and strong fuel adaptability. ℃) will easily cause a series of technical problems such as poor interface reaction between electrolyte / electrode and electrode / bipolar plate, electrode active sintering degradation, interface electrochemical performance reduction, and packaging difficulty, making it difficult to commercialize. The medium and low temperature of SOFCs has become an inevitable trend of its commercial development. Among them, the development of new composite electrolyte materials is one of the key technologies to realize the low temperature of SOFCs. [0003] At present, the research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1016H01M8/1069
CPCH01M8/1016H01M8/1069Y02P70/50Y02E60/50
Inventor 杨晓伟蔡铜祥黄兵
Owner 盐城市新能源化学储能与动力电源研究中心