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Anode of high-temperature solid-state fuel cell and cell stack unit

A fuel cell stack, fuel cell technology, applied in solid electrolyte fuel cells, fuel cell grouping, battery electrodes, etc., can solve problems such as nickel particles reducing anode porosity and conductive current collection performance, battery performance degradation, and battery structure damage. , to solve the problem of performance degradation, improve stability and prolong service life

Active Publication Date: 2015-12-16
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual use, on the one hand, the repeated oxidation and reduction of nickel during the battery cycle causes its own structure to change repeatedly. The mutual change of the two structures of metallic nickel and nickel oxide is always accompanied by a change in volume, which is easy to cause damage to the battery structure. causing battery performance degradation
On the other hand, high-temperature solid-state fuel cells need to operate at high temperatures. During the long-term operation of the battery at this temperature, the growth of nickel particles reduces the porosity and electrical conductivity of the anode, especially triggering or intensifying the development of the previous aspect.

Method used

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  • Anode of high-temperature solid-state fuel cell and cell stack unit

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Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, the high temperature solid fuel cell stack unit such as figure 1 As shown, it is composed of a single cell and a metal connector. The single cell is composed of an anode layer, an electrolyte layer, a cathode layer and a cathode buffer layer. The connector protective layer is between the single cell and the metal connector.

[0038] Anode layer materials are NiO (nickel oxide), YSZ (yttria stabilized zirconia) and Ti 3 AlC 2 , prepared by the following method: the above three materials are mixed in proportion, Ti 3 AlC 2 Accounting for 15% of the mass of the substance to be substituted (nickel or / and nickel compound), after grinding and dispersing, it is dried and heat-treated to obtain the anode powder; the anode powder is prepared into a slurry, and when the battery is an anode-supported type, the slurry The slurry is cast as the anode, and when the battery is electrolyte-supported, the slurry is screen-printed as the anode.

[0039] The electr...

Embodiment 2

[0048] In this embodiment, the structure of the high-temperature solid-state fuel cell stack unit is exactly the same as that of the high-temperature solid-state fuel cell stack unit in Embodiment 1.

[0049] The difference is that the ceramic high-temperature conductive material contained in the anode layer, cathode layer, cathode buffer layer and connector protective layer is changed to Ti 3 C 2 , the substitution ratio is the same as in Example 1.

[0050] Because Ti 3 C 2 with Ti 3 AlC 2 The high-temperature electrical conductivity is similar, and the electrical performance of the above-mentioned high-temperature solid-state fuel cell stack is basically the same as that of Example 1, the difference being:

[0051] with Ti 3 AlC 2 Compared to Ti 3 C 2 The material has strong plasticity, and its replacement in the battery anode layer, cathode layer and cathode buffer layer can better improve the contact effect between the battery and the connector.

Embodiment 3

[0053] In this embodiment, the structure of the high-temperature solid-state fuel cell stack unit is exactly the same as that of the high-temperature solid-state fuel cell stack unit in Embodiment 1.

[0054] The difference is that the ceramic high-temperature conductive material contained in the anode layer, cathode layer, cathode buffer layer and connector protective layer is changed to ZrB 2 , the substitution ratio is the same as in Example 1.

[0055] ZrB 2 The high temperature conductivity of the material is higher than that of Ti 3 C 2 with Ti 3 AlC 2 High, the electric performance of above-mentioned warm solid-state fuel cell stack is better than embodiment 1 and embodiment 2, and difference is:

[0056] ZrB 2 Although the thermal expansion coefficient of stainless steel is in the same order of magnitude as that of stainless steel, there is a large difference. When used as a protective layer for connectors, a transition layer needs to be sprayed in advance as a b...

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Abstract

The invention provides an anode of a high-temperature solid-state fuel cell. The anode adopts the structure that nickel or / and a nickel compound is replaced by a ceramic high-temperature conductive material, on one hand, the ceramic high-temperature conductive material does not change structurally along with the oxidation-reduction reaction of the cell to avoid performance reduction caused by structural damage of the cell, on the other hand, the ceramic high-temperature conductive material can separate nickel particles microcosmically to inhibit growth of the nickel particles, so as to facilitate performance stability improvement of the cell, and prolong the service life of the cell. Besides, for a cell stack unit comprising the anode, the cathode active layer, the cathode buffer layer, and / or the connecting part protective layer of the cell stack unit also comprise(s) the ceramic high-temperature conductive material, so as to further improve the conductivity of the cell stack unit.

Description

technical field [0001] The invention belongs to the technical field of high-temperature solid-state fuel cells, and in particular relates to an anode and a cell stack unit of a high-temperature solid-state fuel cell. Background technique [0002] High-temperature solid-state fuel cells and metal connectors are stacked alternately to form a battery stack. A single cell and a connector form a stack unit. The battery stack can be assembled into a system for distributed power generation by connecting in series or in parallel. Therefore, the battery stack has good high temperature Conductivity and low internal resistivity are the prerequisite and basis for obtaining a high-efficiency power generation system. [0003] In order to obtain good high-temperature conductivity and low resistivity of the battery stack, it is necessary to ensure that the battery stack components (mainly single cells and connectors) have good conductivity and low resistivity at high temperatures. In order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/12H01M4/86H01M4/90H01M8/24
CPCH01M4/86H01M4/8647H01M4/90H01M8/12H01M8/24Y02E60/50
Inventor 刘武官万兵王建新王成田王琴
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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