Articles by Hojong Kim in JoVE
Determinazione delle proprietà termodinamiche di leghe di metalli alcalino-terrosi-liquido usando la tecnica di forza elettromotrice Thomas P. Nigl1, Nathan D. Smith1, Timothy Lichtenstein1, Jarrod Gesualdi1, Kuldeep Kumar1, Hojong Kim1 1Department of Materials Science and Engineering, The Pennsylvania State University Questo protocollo descrive la misura della forza elettromotrice di elementi alcalino-terrosi in leghe di metallo liquidi a temperature elevate (723-1.123 K) per determinare le loro proprietà termodinamiche, tra cui attività, Entropia molare parziale, parziale molare entalpia e temperature di transizione di fase, sopra una gamma ampia composizione.
Other articles by Hojong Kim on PubMed
Calcium-based Multi-element Chemistry for Grid-scale Electrochemical Energy Storage Nature Communications. | Pubmed ID: 27001915 Calcium is an attractive material for the negative electrode in a rechargeable battery due to its low electronegativity (high cell voltage), double valence, earth abundance and low cost; however, the use of calcium has historically eluded researchers due to its high melting temperature, high reactivity and unfavorably high solubility in molten salts. Here we demonstrate a long-cycle-life calcium-metal-based rechargeable battery for grid-scale energy storage. By deploying a multi-cation binary electrolyte in concert with an alloyed negative electrode, calcium solubility in the electrolyte is suppressed and operating temperature is reduced. These chemical mitigation strategies also engage another element in energy storage reactions resulting in a multi-element battery. These initial results demonstrate how the synergistic effects of deploying multiple chemical mitigation strategies coupled with the relaxation of the requirement of a single itinerant ion can unlock calcium-based chemistries and produce a battery with enhanced performance.