Publication date: 10th April 2024
Rate capability is a limiting factor in solid oxide fuel cells (SOFCs), solid oxide electrolysis cells (SOECs), and oxide-based solid-state lithium (SSLiBs) and sodium (SSNaBs) batteries due to high area specific resistance (ASR). Lower ASR SOFC, SOEC, SSLiB, and SSNaB structures would enable higher power density and lower cost, dramatically improving market adoption of these energy conversion and storage technologies. In this presentation we will explain the roles of solid ion-conductor composition, structure, and interfaces in reducing ASR to achieve extremely high current densities. Results will be presented for GDC based SOFCs/SOECs, Li-garnet based SSLiBs, and NASICON based SSNaBs, and similarities between these dissimilar materials and electrochemical devices elucidated. Moreover, we will demonstrate that SOFC and SOEC current densities over 5 A/cm2 can be achieved at 650°C, and SSNaB and SSLiB current densities of 30 mA/cm2and 100 mA/cm2, respectively, can be achieved at room temperature, based on these similarities.
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