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Solid fuel cell and preparation method thereof

A fuel cell, solid-state technology, used in fuel cells, battery electrodes, circuits, etc., can solve the problems of cumbersome process, difficult to maintain the stability of anode structure, harsh reaction conditions, etc.

Active Publication Date: 2021-03-23
深圳市贝特瑞新能源技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation of SOFC cells, Ti 4+ ions to be reduced to Ti 3+ Ions often require multiple step-by-step high-temperature sintering in a reducing atmosphere, the reaction conditions are harsh, the process is cumbersome and the battery production cycle is long
In addition, during multiple sintering processes, the porous structure of the anode will be damaged, making it difficult to maintain the stability of the anode structure

Method used

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  • Solid fuel cell and preparation method thereof

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preparation example Construction

[0086] The present application also provides a preparation method of a solid fuel cell, such as image 3 shown, including the following steps:

[0087] S10, the SrCO 3 Powder and TiO 2 The powder is mixed and added with a binder, and pressed to form an anode layer, and the material of the anode layer includes strontium titanate;

[0088] S20, coating the first slurry containing solid lithium ion conductor material and electrolyte material on one side of the anode layer to form an electrolyte layer on the surface of the anode layer; Coating the second slurry of the substance on the side of the electrolyte layer away from the anode layer to form an electrolyte layer on the surface of the anode layer;

[0089] S30, drying and sintering the green body to obtain a battery precursor;

[0090] S40, connect the anode layer to the negative pole of the power supply, connect the cathode layer to the positive pole of the power supply, so that the lithium ion compound is electrolyzed, ...

Embodiment 1

[0136] (1) 147.62g of SrCO 3 powder with 79.9g of TiO 2 The powders were mixed, 45.504g of carbon powder was added as a pore-forming agent, and 1% polyvinyl alcohol (PVA) of the total mass of the above-mentioned powder was added, that is, 2.73g of PVA was used as a binder. After the powder is refined and mixed uniformly by ball milling, the powder is pressed into an anode layer by dry pressing. Among them, zirconia balls with a diameter of 3 mm are used for ball milling, and the ball milling speed is 300 r / min.

[0137] (2) Prepare the first slurry (electrolyte layer slurry)

[0138] First, sequentially weigh 13.3 g of Li 2 CO 3 , 70.2 g ZrO 2 , 103.5 g NH 4 h 2 PO 4 Powder, the powder is refined and mixed uniformly by ball milling, kept at 1000°C for 10 hours, and then cooled naturally to prepare LiZr 2 (PO 4 ) 3 Powder. Among them, zirconia balls with a diameter of 1 mm are used for ball milling, and the ball milling speed is 400 r / min.

[0139] Weigh 50g of com...

Embodiment 2

[0145] The only difference between this embodiment and embodiment 1 is that 8YSZ, Li 7 La 3 Zr 2 o 12 The first slurry (electrolyte layer slurry) was prepared with the same organic solvent.

[0146] In the solid oxide fuel cell prepared above, the anode layer material includes strontium titanate and lithium-doped strontium titanate, the thickness is 10mm, and the porosity is 20%; the electrolyte layer includes 8YZ and Li 7 La 3 Zr 2 o 12 material, the cathode layer consists of La 0.5 Sr 0.5 MnO 3 Material. The thickness of the anode layer is 10mm, the porosity is 20%, the mass proportion of lithium-doped strontium titanate in the anode layer is 15%; the thickness of the electrolyte layer is 5 μm, dense and non-porous; The rate is 10%.

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Abstract

The invention relates to the field of fuel cells, and provides a solid fuel cell and a preparation method thereof. The solid fuel cell comprises an anode layer, a cathode layer and an electrolyte layer arranged between the anode layer and the cathode layer, is characterized in that the material of the anode layer comprises strontium titanate and lithium-doped strontium titanate, the material of the cathode layer comprises perovskite oxide, and the material of the electrolyte layer comprises a solid lithium ion conductor material and an electrolyte material; Ti in strontium titanate in the anode layer is +3 in valence; and the anode layer and the cathode layer have porous structures. According to the solid fuel cell and the preparation method thereof, the stability of the anode porous structure is maintained, the power density of the cell is improved, the preparation efficiency is improved, and the preparation cost is reduced.

Description

technical field [0001] The present application relates to the field of fuel cell technology, in particular, to a solid-state fuel cell and a preparation method thereof. Background technique [0002] The existing solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) has attracted people's attention because it can directly convert chemical energy into electrical energy without undergoing a combustion process, and has higher energy conversion efficiency. Studies have shown that SrTiO 3 The material can provide a large number of oxygen ion vacancies, so that the anode has ion / electronic mixed conductivity, and can expand the reaction interface of SOFC from the original gas / electrode / electrolyte three-phase interface to the entire gas / electrode two-phase interface, increasing the electrode reactivity , reducing the polarization loss. SrTiO 3 The material not only has good electrochemical catalytic performance for hydrocarbon fuels, but also can resist sulfur poisoning. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M8/1253
CPCH01M4/8605H01M4/9033H01M8/1253Y02E60/50
Inventor 马朝晖卜瑶付文浩王英杰张莹莹李子坤任建国
Owner 深圳市贝特瑞新能源技术研究院有限公司
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