American Chemical Society
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Investigation of Ca Insertion into α‑MoO3 Nanoparticles for High Capacity Ca-Ion Cathodes

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journal contribution
posted on 2022-03-02, 21:45 authored by Sanghyeon Kim, Liang Yin, Seong-Min Bak, Timothy T. Fister, Haesun Park, Prakash Parajuli, Jihyeon Gim, Zhenzhen Yang, Robert F. Klie, Peter Zapol, Yonghua Du, Saul H. Lapidus, John T. Vaughey
Calcium-ion batteries (CIBs) are a promising alternative to lithium-ion batteries (LIBs) due to the low redox potential of calcium metal and high abundance of calcium compounds. Due to its layered structure, α-MoO3 is regarded as a promising cathode host lattice. While studies have reported that α-MoO3 can reversibly intercalate Ca ions, limited electrochemical activity has been noted, and its reaction mechanism remains unclear. Here, we re-examine Ca insertion into α-MoO3 nanoparticles with a goal to improve reaction kinetics and clarify the storage mechanism. The α-MoO3 electrodes demonstrated a specific capacity of 165 mA h g–1 centered near 2.7 V vs Ca2+/Ca, stable long-term cycling, and good rate performance at room temperature. This work demonstrates that, under the correct conditions, layered oxides can be a promising host material for CIBs and renews prospects for CIBs.