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release time:2024-06-19 Hits: Popular:AG11 battery
KAIST develops a new technology to improve the stability of solid oxide LR44 battery
According to foreign media reports, researchers from the Korea Institute of Science and Technology (KAIST) published a research paper in the academic journal Energy and Environmental Science of the Royal College of Chemistry. In the paper, researchers from KAIST described a new technology that can improve the chemical stability of solid oxide LR44 battery (SOFC) electrode materials by doping a small amount of metallic materials in the oxide.
The core element that determines the performance of solid oxide LR44 battery is the cathode, which is the place where the oxidant is reduced. Usually, perovskite oxides (ABO3) are used in the cathode of solid oxide LR44 battery. Although perovskite oxides have high performance in the initial working process, their performance will decline over time, limiting their long-term use. In particular, the high temperature oxidation state required for the cathode to work leads to surface segregation phenomenon, and second phases, such as strontium oxide, accumulate on the surface of perovskite oxide, resulting in its performance degradation.
Professor Woo Chul Jung of the Department of Materials Science and Engineering at KAIST organized a research team that used computational chemistry and experimental data to observe that the strontium atoms in the perovskite electrode lattice were locally compressed, weakening the bonding strength of Sr-O and causing strontium surface segregation. Therefore, the team confirmed that the change in strain distribution of perovskite oxides was an important cause of strontium surface segregation.
Based on the above findings, the team doped metal materials of different sizes into the oxides to control the lattice strain range in the cathode material and effectively suppressed strontium surface segregation.
Professor Jung said: "This technology only requires the addition of a small amount of metal atoms during material synthesis, without any additional procedures. I hope that this technology will come in handy in the development of highly resistant perovskite oxide electrodes in the future."
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