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Emerging intercalation chemistry of cathode materials for calcium-ion batteries

Emerging intercalation chemistry of cathode materials for calcium-ion batteries
Hong, Seung-Tae
DGIST Authors
Hong, Seung-Tae
Issue Date
제125회 대한화학회 학술발표회
Li-ion batteries (LIBs) are one of the most successful energy storage devices for portable electronics applications, electric vehicles, and utility grids. However, there are still strong needs for higher energy density and lower price materials than what the LIB systems can provide. Calcium-ion batteries (CIBs) are one of the promising candidates to overcome such limitations of LIBs. The divalency of calcium as the carrier ion can increase the capacity of a host material because two electrons are transferred per carrier ion. The earth-abundance of calcium resources provides potential cost-effectiveness to the products. Calcium has the redox potential (Ca/Ca2+ = −2.87 V vs. SHE) close to Li, potentially leading to a higher cell operating voltage. Calcium ion also has a relatively low effective intercalant-ion charge density (0.49 e/Å3), compared to other multivalent cations such as Mg2+ (1.28 e/Å3), Zn2+ (1.18 e/Å3), and Al3+ (4.55 e/Å3), enabling fast diffusion kinetics for Ca ions in solids as well as in electrolytes. Recent discoveries of reversible plating or alloying of calcium provoked considerable interest in calcium-based rechargeable batteries. Theoretical calculations also predict that the energy barriers for Ca diffusion are lower than other multivalent ions in some structures, and the development of positive materials are anticipated. However, only a few cathode materials have been reported so far, only to exhibit low energy-storage capability and poor cyclability. In this talk, recent progress in our exploration of the intercalation chemistry of calcium ions into various host materials will be presented, utilizing aqueous electrolytes as well as non-aqueous electrolytes.
Related Researcher
  • Author Hong, Seung-Tae Battery Materials Discovery Laboratory
  • Research Interests Magnesium, calcium, and zinc ion batteries; lithium all-solid-state batteries; Inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Ca, Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
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Department of Energy Science and EngineeringBattery Materials Discovery Laboratory2. Conference Papers

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