High Voltage Mg-Ion Battery Cathode via a Solid Solution Cr–Mn Spinel Oxide
Lattice Mg2+ in a tailored solid solution spinel, MgCrMnO4, is electrochemically utilized at high Mn-redox potentials in a nonaqueous electrolyte. Complementary evidence from experimental and theoretical analyses supports bulk Mg2+ (de)intercalation throughout the designed oxide frame where strong...
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| Veröffentlicht in: | Chemistry of materials 2020-08, Vol.32 (15), p.6577-6587 |
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| creator | Kwon, Bob Jin Yin, Liang Park, Haesun Parajuli, Prakash Kumar, Khagesh Kim, Sanghyeon Yang, Mengxi Murphy, Megan Zapol, Peter Liao, Chen Fister, Timothy T Klie, Robert F Cabana, Jordi Vaughey, John T Lapidus, Saul H Key, Baris |
| description | Lattice Mg2+ in a tailored solid solution spinel, MgCrMnO4, is electrochemically utilized at high Mn-redox potentials in a nonaqueous electrolyte. Complementary evidence from experimental and theoretical analyses supports bulk Mg2+ (de)intercalation throughout the designed oxide frame where strong electrostatic interaction between Mg2+ and O2– exists. Mg/Mn antisite inversion in the spinel is lowered to ∼10% via postannealing at 350 °C to further improve Mg2+ mobility. Spinel lattice is preserved upon removal of Mg2+ without any phase transformations, denoting structural stability at the charged state at a high potential ∼3.0 V (vs Mg/Mg2+). Clear remagnesiation upon first discharge, harvesting up to ∼180 Wh/kg at 60 °C is shown. In the remagnesiated state, insertion of Mg2+ into interstitial sites in the spinel is detected, possibly resulting in partial reversibility which needs to be addressed for structural stability. The observations constitute a first clear path to the development of a practical high voltage Mg-ion cathode using a spinel oxide. |
| doi_str_mv | 10.1021/acs.chemmater.0c01988 |
| format | Article |
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In the remagnesiated state, insertion of Mg2+ into interstitial sites in the spinel is detected, possibly resulting in partial reversibility which needs to be addressed for structural stability. 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Mater</addtitle><date>2020-08-11</date><risdate>2020</risdate><volume>32</volume><issue>15</issue><spage>6577</spage><epage>6587</epage><pages>6577-6587</pages><issn>0897-4756</issn><eissn>1520-5002</eissn><abstract>Lattice Mg2+ in a tailored solid solution spinel, MgCrMnO4, is electrochemically utilized at high Mn-redox potentials in a nonaqueous electrolyte. Complementary evidence from experimental and theoretical analyses supports bulk Mg2+ (de)intercalation throughout the designed oxide frame where strong electrostatic interaction between Mg2+ and O2– exists. Mg/Mn antisite inversion in the spinel is lowered to ∼10% via postannealing at 350 °C to further improve Mg2+ mobility. Spinel lattice is preserved upon removal of Mg2+ without any phase transformations, denoting structural stability at the charged state at a high potential ∼3.0 V (vs Mg/Mg2+). Clear remagnesiation upon first discharge, harvesting up to ∼180 Wh/kg at 60 °C is shown. In the remagnesiated state, insertion of Mg2+ into interstitial sites in the spinel is detected, possibly resulting in partial reversibility which needs to be addressed for structural stability. 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| subjects | Electrodes ENERGY STORAGE Lattices Oxides Spinel Transition metals |
| title | High Voltage Mg-Ion Battery Cathode via a Solid Solution Cr–Mn Spinel Oxide |
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