S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
High-Voltage Phosphate Cathodes for Rechargeable Ca-Ion Batteries
- Kim, Sanghyeon; Yin, Liang; Lee, Myeong Hwan; Parajuli, Prakash; Blanc, Lauren; Fister, Timothy T.; Park, Haesun; Kwon, Bob Jin; Ingram, Brian J.; Zapol, Peter; Klie, Robert F.; Kang, Kisuk; Nazar, Linda F.; Lapidus, Saul H.; Vaughey, John T.
- Issue Date
- Acs Energy Letters, Vol.5 No.10, pp.3203-3211
- Calcium-ion batteries (CIBs) are under investigation as next-generation energy storage devices due to their theoretically high operating potentials and lower costs tied to the high natural abundance of calcium. However, the development of CIBs has been limited by the lack of available positive electrode materials. Here, for the first time, we report two functional polyanionic phosphate materials as high-voltage cathodes for CIBs at room temperature. NaV2(PO4)(3) electrodes were found to reversibly intercalate 0.6 mol of Ca2+ (81 mA h g(-1)) near 3.2 V (vs Ca2+/Ca) with stable cycling performance at a current density of 3.5 mA g(-1). The olivine framework material FePO4 reversibly intercalates 0.2 mol of Ca2+ (72 mA h g(-1)) near 2.9 V (vs Ca-2(+)/Ca) at a current density of 7.5 mA g(-1) in the first cycle. Structural, electronic, and compositional changes are consistent with reversible Ca2+ intercalation into these two materials.
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