Composite ceramic connector for tubular solid oxide fuel cell and preparation method thereof

Abstract

The invention relates to a composite ceramic connector for a tubular solid oxide fuel cell and a preparation method thereof, in particular to a composite ceramic connector for an anode support tubular solid oxide fuel cell and a preparation method thereof, and belongs to the field of fuel cell materials. The composite ceramic connecting body for the tubular solid oxide fuel cell of the present invention is composed of a lanthanum-doped strontium titanate layer and a strontium-lanthanum manganate layer, and the lanthanum-doped strontium titanate slurry is firstly coated with the slurry The material is brushed on the anode, and after drying, the slurry of strontium lanthanum manganate is painted on it, and then co-fired with the anode of the tubular battery to obtain a dense double-layer composite ceramic connector. The invention has the advantages of simple process, low preparation cost, stable and reliable connecting body, firm structure and good combination, and is beneficial to reduce the cost of the tubular SOFC cell stack.

Description

technical field

[0001] The invention relates to a composite ceramic connector for a tubular solid oxide fuel cell and a preparation method thereof, in particular to a composite ceramic connector for an anode support tubular solid oxide fuel cell and a preparation method thereof, and belongs to the field of fuel cell materials. Background technique

[0002] As a new energy technology, fuel cells have many advantages such as high efficiency, cleanliness, safety and reliability. In addition to the common advantages of fuel cells such as high efficiency and environmental friendliness, solid oxide fuel cells (SOFC) make their design more flexible, more convenient to operate, and safer and more reliable due to their all-solid-state characteristics. Since the operating voltage of SOFC single cells is only about 1V, in practical applications, it is necessary to use connectors to assemble single cells into battery stacks to increase their output voltage and output power. Among them,...

Examples

Embodiment 1

[0034] Example 1: Preparation of tubular SOFC double-layer composite ceramic connector

[0035] The lanthanum-doped strontium titanate powder used in the present invention is synthesized by a solid-state reaction method. As the La doping amount increases from 0.1 to 0.4, the electrical conductivity of the material also increases gradually. But more than 0.4 will appear the second phase. Therefore the preferred embodiment of the present invention is a powder with a La doping amount of 0.4 (La 0.4 Sr 0.6 TiO 3 )As research target. La 0.8 Sr 0.2 MnO 3 The powder is a commercially available powder.

[0036] Lanthanum-doped strontium titanate (La 0.4 Sr 0.6 TiO 3 ) 44 grams of powder, 100 grams of ethanol, 1.5 grams of TEA, add 200 grams of zirconia grinding balls, ball mill on a planetary ball mill for 1 hour, then add 2 grams of PVB to the above slurry, continue ball milling for 2 hours, and then vacuumize After 2-3 minutes, the air in the slurry is removed to obtain ...

Embodiment 2

[0040] Example 2: Performance testing of tubular cells and performance characterization of connectors

[0041] According to the tubular single cell prepared in Example 1, the experimental conditions for its power generation performance test are:

[0042] Cathode area: 11cm 2(thickness is about 50-60 microns);

[0043] Connector area: 2.5cm 2 ; Thickness about 35 microns (La 0.4 Sr 0.6 TiO 3 about 20 microns, La 0.8 Sr 0.2 MnO 3 about 15 microns);

[0044] Test gas: H 2 , O 2 , not sealed. h 2 The flow rate is 100ml / min, O 2 The flow rate is 80ml / min.

[0045] Experimental results such as figure 2 shown. Under the condition of 900℃, the maximum power density of the battery can reach 140mW / cm 2 , The total output power of a single battery can reach about 1.5 watts.

[0046] As an electrical connection material, the connecting body should theoretically have as small a resistance as possible. From image 3 It can be seen that at 900 °C, 850 °C and 800 °C, the ...

Embodiment 3

[0047] Example 3: The influence of the thickness ratio of the composite connector on the performance of the battery

[0048] The linker preparation method is similar to Example 1. The difference is that the lanthanum-doped strontium titanate slurry is applied thinner, and the strontium-lanthanum manganate slurry is applied thicker. The experimental conditions for the power generation performance test are:

[0049] Cathode area: 10.12cm 2 (thickness is about 50-60 microns);

[0050] Connector area: 2.25cm 2 ; Thickness about 35 microns (La 0.4 Sr 0.6 TiO 3 About 15 microns, La 0.8 Sr 0.2 MnO 3 about 20 microns);

[0051] Test gas: H 2 , O 2 , not sealed. h 2 The flow rate is 100ml / min, O 2 The flow rate is 80ml / min.

[0052] Experimental results such as Figure 4 shown. When a single cell operates at 900°C, the maximum power density is about 160mW / cm 2 . Battery performance is relative to embodiment 2 (140mW / cm 2 ) has improved to a certain extent. The rea...

technical field

[0001] The invention relates to a composite ceramic connector for a tubular solid oxide fuel cell and a preparation method thereof, in particular to a composite ceramic connector for an anode support tubular solid oxide fuel cell and a preparation method thereof, and belongs to the field of fuel cell materials. Background technique

[0002] As a new energy technology, fuel cells have many advantages such as high efficiency, cleanliness, safety and reliability. In addition to the common advantages of fuel cells such as high efficiency and environmental friendliness, solid oxide fuel cells (SOFC) make their design more flexible, more convenient to operate, and safer and more reliable due to their all-solid-state characteristics. Since the operating voltage of SOFC single cells is only about 1V, in practical applications, it is necessary to use connectors to assemble single cells into battery stacks to increase their output voltage and output power. Among them,...

Examples

Embodiment 1

[0034] Example 1: Preparation of tubular SOFC double-layer composite ceramic connector

[0035] The lanthanum-doped strontium titanate powder used in the present invention is synthesized by a solid-state reaction method. As the La doping amount increases from 0.1 to 0.4, the electrical conductivity of the material also increases gradually. But more than 0.4 will appear the second phase. Therefore the preferred embodiment of the present invention is a powder with a La doping amount of 0.4 (La 0.4 Sr 0.6 TiO 3 )As research target. La 0.8 Sr 0.2 MnO 3 The powder is a commercially available powder.

[0036] Lanthanum-doped strontium titanate (La 0.4 Sr 0.6 TiO 3 ) 44 grams of powder, 100 grams of ethanol, 1.5 grams of TEA, add 200 grams of zirconia grinding balls, ball mill on a planetary ball mill for 1 hour, then add 2 grams of PVB to the above slurry, continue ball milling for 2 hours, and then vacuumize After 2-3 minutes, the air in the slurry is removed to obtain ...

Embodiment 2

[0040] Example 2: Performance testing of tubular cells and performance characterization of connectors

[0041] According to the tubular single cell prepared in Example 1, the experimental conditions for its power generation performance test are:

[0042] Cathode area: 11cm 2(thickness is about 50-60 microns);

[0043] Connector area: 2.5cm 2 ; Thickness about 35 microns (La 0.4 Sr 0.6 TiO 3 about 20 microns, La 0.8 Sr 0.2 MnO 3 about 15 microns);

[0044] Test gas: H 2 , O 2 , not sealed. h 2 The flow rate is 100ml / min, O 2 The flow rate is 80ml / min.

[0045] Experimental results such as figure 2 shown. Under the condition of 900℃, the maximum power density of the battery can reach 140mW / cm 2 , The total output power of a single battery can reach about 1.5 watts.

[0046] As an electrical connection material, the connecting body should theoretically have as small a resistance as possible. From image 3 It can be seen that at 900 °C, 850 °C and 800 °C, the ...

Embodiment 3

[0047] Example 3: The influence of the thickness ratio of the composite connector on the performance of the battery

[0048] The linker preparation method is similar to Example 1. The difference is that the lanthanum-doped strontium titanate slurry is applied thinner, and the strontium-lanthanum manganate slurry is applied thicker. The experimental conditions for the power generation performance test are:

[0049] Cathode area: 10.12cm 2 (thickness is about 50-60 microns);

[0050] Connector area: 2.25cm 2 ; Thickness about 35 microns (La 0.4 Sr 0.6 TiO 3 About 15 microns, La 0.8 Sr 0.2 MnO 3 about 20 microns);

[0051] Test gas: H 2 , O 2 , not sealed. h 2 The flow rate is 100ml / min, O 2 The flow rate is 80ml / min.

[0052] Experimental results such as Figure 4 shown. When a single cell operates at 900°C, the maximum power density is about 160mW / cm 2 . Battery performance is relative to embodiment 2 (140mW / cm 2 ) has improved to a certain extent. The rea...

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