A solid oxide battery chip with a double electrolyte structure and its preparation method

Abstract

The invention provides a solid oxide battery chip with a double electrolyte structure and a preparation method, belonging to the technical field of electrochemistry. It includes two electrolyte layers, the two electrolyte layers are separated by an internal electrode sandwiched between them, and regularly arranged air passages are arranged inside the internal electrode, and at least two sides of the internal electrode are covered with side sealing members, and the outer surface of the electrolyte is arranged There are outer surface components, the outer surface components include an intermediate layer, an outer electrode, an inner electrode plate and an outer electrode plate, the inner electrode is connected to the inner electrode plate, and the outer electrode is connected to the outer electrode plate. The side sealing layer is set to a multi-layer structure, the inner sub-layer can increase the resistance of the gas flowing through the inner electrode to leak out, the material of the outer sub-layer is different from the inner sub-layer material in composition and structure, it can prevent The leaked gas after decompression is better sealed and the structural strength can be better maintained.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a solid oxide battery chip and a preparation method, in particular to a solid oxide battery chip with a double electrolyte structure and a preparation method. Background technique [0002] 1. Working principle of solid oxide cell (Solid Oxide Cell, SOC) [0003] A solid oxide cell (Solid Oxide Cell, SOC) is a ceramic electrochemical device that uses solid oxide as an electrolyte. It consists of at least one layer of electrolyte and at least two electrodes. The electrodes that provide the overall strength of the battery are called electrode supports. Solid oxide battery, which is called an electrolyte-supported solid oxide battery, is provided by the electrolyte to provide the overall strength of the battery. The electrolyte material is usually doped stabilized zirconia, such as yttria doped stabilized zirconia (YSZ), Sc 2 o 3 Doped stabilized zirconia (ScSZ), scandia yt...

AI Technical Summary

Problems solved by technology

Whether it is glass or metal sealing rings, it is difficult to achieve these performance requirements at the same time. For example, glass sealing rings are usually very fragile, and they are very easy to break and fail during SOC stacking and thermal cycle operations, even if glass is used to barely achieve the sealing of ceramics and metals. , the temperature change rate it can tolerate must also be very small to avoid excessive stress and excessive strain on the sealing ring, which leads to very long start-up and shutdown times for stacks using common solid oxide battery technology, usually More than 10 hours, some even more than 20 hours

[0029] 2) Since each stacking component needs to be manufactured separately, the technical requirements are high, such as the flatness, strength, toughness, oxidation resistance, and thermal expansion matching of each component have high requirements, so the chip SOC stacking cost is usually higher , which limits the practical application

[0030] 3) The stacking flexibility is low

[0035] The battery of the above-mentioned existing patent needs to work across high temperature and low temperature areas, that is, the electrodes of the battery work in the high temperature area, and the sealing and external connection of the battery are realized in the low temperature area, so the entire battery will inevitably dissipate heat from the battery during operation. The high temperature area is transferred to the low temperature area, causing heat loss and reducing system efficiency

Due to the complex manufacturing process of batteries using such technical solutions, only rectangular or square batteries with relatively simple shapes can be prepared in practice.

In this shape design, the channels through which heat is transferred from the high-temperature area to the low-temperature area are equal in size and cross-sectional area, and the heat loss is relatively large.

If a tapered structure can be adopted, that is, the size of the battery is gradually reduced from the high-temperature working part to the low-temperature sealing part, the passage of heat loss from high temperature to low temperature can be gradually narrowed, which is conducive to reducing the heat loss rate caused by the battery , but this is difficult to realize in the known technical scheme due to the complex process

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