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Electrolyte layer, preparation method and application thereof

An electrolyte layer and electrolyte technology, applied in circuits, fuel cells, electrical components, etc., can solve problems such as low power, low density, and large loss of fuel cells/electrolytes, so as to increase power density and achieve grain growth , to avoid the effect of cracking

Active Publication Date: 2021-10-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an electrolyte layer, a preparation method and its application. , use the traditional screen printing process to prepare the ultra-thin electrolyte layer doped with cerium oxide (DCO, including GDC, SDC, etc.), thus solving the problem of the electrolyte layer memory after sintering the ultra-thin electrolyte layer prepared by screen printing. In the penetrating through hole, the density is low, which leads to the technical problems of high loss and low power of the fuel cell / electrolyzer in the medium and low temperature range

Method used

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  • Electrolyte layer, preparation method and application thereof
  • Electrolyte layer, preparation method and application thereof

Examples

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Embodiment 1

[0037] 1. Preparation of Support

[0038] In this embodiment, dry pressing and sintering are used to prepare the support body. In the battery support, NiO and pore-forming agent (starch) account for 60% and 10% of the total mass of NiO and GDC / SDC respectively, and the required powder is mixed evenly in a high-energy ball mill at a speed of 300r / min, and then dried , Grinding. During the preparation, 0.4 g of the dried powder was weighed each time, and dry-pressed under a pressure of 12 MPa for 1 min to obtain a formed support sheet. Then pre-sinter at 1050°C for 3h, the specific sintering process can refer to figure 1 Middle (b). After sintering, a support sheet with a thickness of 0.6 mm can be obtained.

[0039] 2. Preparation of Binder

[0040] Add ethyl cellulose to terpineol, and stir in an oil bath at 90°C for 24 hours and mix well to obtain a binder, wherein the content of ethyl cellulose is 4wt.%. In addition, add 2.5wt. % fish oil as a dispersant.

[0041] 3. ...

Embodiment 2

[0060] 1. Preparation of Support

[0061] In this embodiment, the support body is prepared by tape casting, degreasing, and pre-sintering. First weigh the mixed powder of 55wt.% NiO (standard type) and 45wt.% GDC / SDC (SOFCMAN) as powder, add herring oil (dispersant), solvent (equal volume of ethanol and xylene) and a certain amount Starches (pore-forming agents) are mixed evenly by ball milling for 24 hours. Then, add PVB B-98, PAG, BBP and cyclohexanone, and continue ball milling for 24 hours to make the slurry evenly mixed. Before casting, the slurry needs to be stirred for 27 minutes under a vacuum of 0.08MPa to complete the defoaming process. Subsequently, the slurry was poured on a casting machine for casting, and the flow rate of the casting machine was 4 mm s -1, the head height is fixed at 2mm. After 72 hours of air-drying, the green body was removed and cut into discs with a diameter of 16mm by a manual button punching machine, which was the final green body of th...

Embodiment 3-4

[0078] Example 3-4, Comparative Example 1-2 The same method as Example 1 was used to prepare the electrolyte layer, but the sintering process was different. For details, please refer to Table 1. The electrolyte prepared by Example 3-4 and Comparative Example 1-2 See also Table 1 for layer thickness and compactness.

[0079] Table 1 Electrolyte thickness and density obtained under different sintering processes

[0080] Sintering maximum temperature (℃) Holding time (h) Thickness (μm) Density Example 1 1550 6 4.5 93％ Comparative example 1 1450 4 8.5 67％ Comparative example 2 1450 8 7.3 72％ Example 3 1500 4 7.1 70％ Example 4 1500 8 6.5 82％

[0081] It can be seen that the density of the electrolyte layer will decrease below the maximum sintering temperature of 1500°C provided by the present invention; the density of 93% can be achieved at the maximum sintering temperature of 1550°C for 6 hours.

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Abstract

The invention discloses an electrolyte layer, a preparation method and application thereof. The method comprises the following steps of (1) preparing electrolyte slurry, namely mixing electrolyte powder and an adhesive, and grinding to obtain the electrolyte slurry; (2) carrying out silk-screen printing on an electrolyte, namely printing the electrolyte slurry on the surface of a support body via at least two times of silk-screen printing; and (3) sintering the electrolyte, namely sintering the support body printed with the electrolyte slurry in air at least five times at different heating rates, keeping the temperature for 30-90 minutes before changing the heating rate each time, keeping the temperature for 4-8 hours after heating to the highest temperature of 1500-1600 DEG C, and then cooling at at least three times at different cooling rates, keeping the temperature for 30-90 minutes before changing the cooling rate every time, and obtaining the electrolyte layer with the thickness smaller than 10 micrometers and the density larger than 70%. According to the present invention, the technical problems of high loss and low power when the electrolyte layer prepared by silk-screen printing is applied to a fuel cell / electrolytic tank are solved.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cell / electrolytic cell, and more specifically, mainly relates to an electrolyte layer, a preparation method and an application thereof. Background technique [0002] Diffusion and reaction between electrolyte material and electrode material, agglomeration and growth of electrode material, electrode material and external environment (including gas environment, stack The reaction between the linker material) leads to the direct deactivation of the battery, which seriously affects its commercialization process. In order to improve the operating life of the battery and realize the rapid start-up of the battery, in recent years, many researches and developments have focused on reducing the operating temperature from high temperature to medium and low temperature (500-650°C). However, in the medium and low temperature range, the problem of slow ion transport determined by thermodynamics makes the batter...

Claims

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Application Information

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IPC IPC(8): H01M8/126
CPCH01M8/126H01M2008/1293Y02E60/50
Inventor 池波胡世明田云峰李宜桐王盼蒲健
Owner HUAZHONG UNIV OF SCI & TECH
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