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Investigation of electrochemical calcium-ion energy storage mechanism in potassium birnessite
- Investigation of electrochemical calcium-ion energy storage mechanism in potassium birnessite
- Hyoung, Joo Eun; Heo, Jong Wook; Hong, Seung Tae
- DGIST Authors
- Hong, Seung Tae
- Issue Date
- Journal of Power Sources, 390, 127-133
- Article Type
- Calcium-ion intercalation-based batteries receive attention as one type of post lithium-ion battery because of their potential advantages in terms of cost and capacity. A birnessite-type manganese oxide, K0.31MnO2·0.25H2O, is characterized by a layered structure with interlayer distances of ∼7 Å. Here, we demonstrate for the first time the electrochemical Ca2+ ion intercalation capability of K-bir, and elucidate the calcium-ion storage mechanism. A reversible electrochemical reaction is observed in cyclic voltammograms and galvanostatic cycles. The initial specific discharge capacity is 153 mAh g−1 at 25.8 mA g−1 (0.1 C) in a 1 M Ca(NO3)2 aqueous electrolyte, with the average discharge voltage of 2.8 V (vs. Ca/Ca2+). X-ray diffraction, transmission electron microscopy, and elemental analyses confirm that Ca2+ ion transport is mainly responsible for the electrochemical reaction. A kinetic analysis using CVs with various scan rates indicates that the reaction mechanism can be described as a combined reaction of a surface-limited capacitance and a diffusion-controlled intercalation. In addition, 3D bond valence sum difference maps show the 2D network for conduction pathways of calcium ions in the structure. This work demonstrates that birnessite-type manganese oxide could be a potential cathode material for calcium-ion batteries. © 2018 Elsevier B.V.
- Elsevier B.V.
- Related Researcher
Battery Materials Discovery Laboratory
Magnesium, calcium, and zinc ion batteries; lithium all-solid-state batteries, New 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 Laboratory1. Journal Articles
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