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Gradient electrode and solid oxide battery

A solid oxide, gradient technology, applied in electrodes, fuel cells, battery electrodes, etc., can solve problems such as unfavorable long-term battery operating life, affecting operating efficiency, and differences in battery planar performance.

Pending Publication Date: 2018-02-23
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uneven distribution of these parameters in the battery plane will lead to performance differences in the battery plane, which not only affects the overall operating efficiency, but also is not conducive to the long-term operating life of the battery
[0008] Existing solid oxide batteries still have room for improvement in performance

Method used

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  • Gradient electrode and solid oxide battery
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  • Gradient electrode and solid oxide battery

Examples

Experimental program
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Effect test

preparation example Construction

[0059] The preparation of the above-mentioned gradient electrode can be achieved by adjusting different particle diameters or different mass fractions of the electrode catalyst at different positions on the electrode surface, adding another single-phase or composite-phase nano electrocatalytic particles, etc.

[0060] Gradient electrode is realized by particle size distribution, that is, the particle size of the catalyst gradually decreases along the direction of the flow field, so that the catalytic surface area, the length of the three-phase boundary of the catalytic reaction, or the number of the three-phase boundary gradually increases.

[0061] The catalyst mass fraction control can be achieved by changing the supported content of the active catalyst to achieve the gradient, that is, changing the ratio of the active catalyst in the composite electrode (composite of the active catalyst + the catalyst carrier, that is, the ion conductor).

[0062] Adding another single-phase or com...

Embodiment 1

[0081] Non-gradient-designed electrode-supported solid oxide battery: 300μm thickness Ni-YSZ support|15μm thickness Ni-YSZ fuel electrode|10μm thickness YSZ electrolyte|20μm thickness LSM-YSZ oxygen electrode, operating temperature 870℃, average current density 1.5 A / cm 2 , Electrolysis gas is 45% CO 2 +45%H 2 O+10%H 2 The conversion rate of the mixed gas is 45%, and the current collecting layer is approximately equipotential, that is, the voltage is equal everywhere V=1.4 volts.

[0082] By adjusting the particle size of the Ni catalyst in the Ni-YSZ fuel electrode and the ion conductor 8YSZ, and using a step gradient from the upstream to the downstream of the airflow, the electrode is gradually refined, that is, the battery is divided into 4 rectangular areas along the direction of the airflow and connected to each other. There is no gap, and the distance between the adjacent boundary and the inlet accounts for 25%, 50% and 75% of the total length of the flow field respectively....

Embodiment 2

[0085] The difference from Example 1 is that the basic structure of the solid oxide battery is 300μm thick Ni-YSZ support|15μm thick Ni-SSZ fuel electrode|10μm thick SSZ electrolyte|5μm thick GDC barrier layer|20μm thick LSCF-GDC oxygen electrode, The porosity of LSCF-GDC is 35%-50%. By adding a new catalyst to the LSCF-GDC oxygen electrode and adjusting its content to obtain a smooth gradient, the electrochemical catalytic performance from the inlet to the outlet of the gas flow is enhanced. Specifically, a liquid microinjection method is used to apply La on the surface and inside of the electrode. 0.6 Sr 0.4 CoO 3-δ CeO 2 Corresponding to the metal ion nitrate precursor solution, the substance content is controlled by the injection speed, so that the increase relative to the entrance is increased from 0 to 15% (near the exit), slowly dried and decomposed and heated to 650-850 ℃ for processing to obtain high activity Nano La 0.6 Sr 0.4 CoO 3-δ CeO 2 (Weight ratio 3:2) cata...

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Abstract

The invention discloses a gradient electrode and a solid oxide battery. The gradient electrode is used for a solid oxide fuel battery or a solid oxide electrolytic cell, and the reaction activity of the gradient electrode is increased in a gradient way along the air flow direction. The gradient electrode and the solid oxide fuel battery or the solid oxide electrolytic cell containing the gradientelectrode have the advantages that the distribution difference of polarizing property of the electrode along the air flow direction can be avoided or effectively reduced, so that the running efficiency of the electrode is ensured, and the attenuation of the battery is relieved.

Description

Technical field [0001] The invention relates to the field of new energy batteries, in particular to a gradient electrode and solid oxide battery. Background technique [0002] Solid Oxide Fuel Cells (SOFC) are considered to be one of the most ideal power sources for clean and efficient cogeneration, distributed power generation, energy Internet, etc. In the past ten years, developed countries such as the United States, Japan and Europe have invested heavily Research and development. [0003] The SOFC generally operates at a high temperature above 600°C. Based on the solid oxide electrolyte that conducts oxygen ions and separates the reaction gas from the anode and the cathode, the electrode reaction does not rely on noble metal catalysts, but uses relatively inexpensive transition metals or rare earth oxides. Another outstanding advantage of SOFC is the wide applicability of fuels. Hydrogen, carbon monoxide, ammonia, methane, etc. can all be used as fuels, and the power density is...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/1231C25B11/03C25B11/04
CPCH01M4/8605H01M4/8636H01M4/8642H01M8/1231H01M2008/1293C25B11/031C25B11/051Y02E60/50
Inventor 陶有堃邵静张宇轩
Owner SHENZHEN UNIV
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