Ningbo Materials found battery performance determinants

Three-phase interface ultra-thin lead implantation process

Microstructure of interface after implanting ultra-thin measuring lead

Under the circumstance that the haze environment is becoming increasingly urgent, solid oxide fuel cells (SOFCs) appear to have more extensive application potential and research value. The SOFC single cell is mainly composed of a supporting anode, an active anode, an electrolyte, and an active cathode. The superior and stable battery performance is a prerequisite for realizing its commercial application. However, for the anode support, the supporting anode thickness is about 400 μm, the active anode is about 10 μm, the electrolyte is about 10 μm, and the active cathode is about 30 μm. Due to the thickness of each component of the battery, the characterization methods commonly used in the industry, such as electrochemical impedance spectroscopy (EIS), are difficult to distinguish between the decisive factors that affect the performance of the battery itself. At the same time, the traditional characterization method can only obtain the variation rule of the battery's overall performance, and can't quantitatively characterize the contribution of each component, resulting in the study of battery performance becoming a bottleneck.

The Solid Oxide Fuel Cell R&D team of the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, skillfully used the battery preparation process to implant ultra-thin electrodes on the three-phase interface between the two sides of the electrolyte. For the first time, a full cell with interface measurement leads was successfully prepared. Using this battery, the output performance of the battery was investigated in-situ. It was found that during the operation of the SOFC, the output performance of the battery was determined by the interface performance of the pole/electrolyte TPB; the increase in the polarization resistance at the anode side was the main reason for the increase in the battery resistance. Source; The output voltage of the battery is more sensitive to ohmic resistance. The results of this study were published online in Full Paper in Advanced Energy Materials (Adv. Energy Mater. doi: 10.1002/aenm.201400120).

The research breaks through the bottleneck of existing battery performance research. For the first time, the in-situ observation of the composition of the battery voltage and the quantitative contribution of the three-phase interface to the battery performance provides a new technical idea for solving the SOFC interface performance characterization and at the same time the performance of the battery. Improve the use of corresponding measures to provide direct experimental basis and reference.

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