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Rechargeable Ca-Ion Batteries: A New Energy Storage System
journal contribution
posted on 2015-12-22, 00:00 authored by Albert
L. Lipson, Baofei Pan, Saul H. Lapidus, Chen Liao, John T. Vaughey, Brian J. IngramAs new uses for larger scale energy
storage systems are realized,
new chemistries that are less expensive or have higher energy density
are needed. While lithium-ion systems have been well studied, the
availability of new energy storage chemistries opens up the possibilities
for more diverse strategies and uses. One potential path to achieving
this goal is to explore chemistries where a multivalent ion such as
Ca2+ or Mg2+ is the active species. Herein,
we demonstrate this concept for a Ca-ion system utilizing manganese
hexacyanoferrate (MFCN) as the cathode to intercalate Ca reversibly
in a dry nonaqueous electrolyte. Through characterization via X-ray
absorption near-edge spectroscopy, it is determined that only the
manganese changes oxidation state during cycling with Ca. X-ray diffraction
indicates the MFCN maintains its crystallinity during cycling, with
only minor structural changes associated with expansion and contraction.
Furthermore, we have demonstrated the first rechargeable Ca-ion battery
utilizing MFCN as the cathode and elemental tin as the anode.