@article{b2c5a116832d475ab4dc03f7c5ed8398,
title = "Atomic-scale observation of phase transition of MgMn2O4 cubic spinel upon the charging in Mg-ion battery",
abstract = "Direct observation of demagnesiated structure of MgMn2O4 spinel oxides at atomic scale has been achieved using spherical aberration-corrected scanning transmission electron microscopy (STEM) with high-angle annular-dark-field (HAADF) and annular-bright-field (ABF) techniques. Upon the Mg ions extraction from MgMn2O4 spinel oxides, structural transition from cubic to tetragonal phases was observed. The phase transition is a result of Mn octahedral distortion due to cooperative Jahn–Teller distortion of six-coordinate MnIII (t2g 3–eg 1). On the basis of HAADF/ABF micrographs and electron energy-loss spectrometer (EELS), it is suggested that Mn3+/Mn4+ and/or Mn3+/Mn5+ redox couples play a crucial role in the first electrochemical Mg deintercalation. This is the first report on observation of cubic-tetragonal phase transition in charged spinel MgMn2O4 which shed new insight into the magnesium storage mechanism in this important cathode material for Mg-ion batteries.",
author = "Truong, {Quang Duc} and Hiroaki Kobayashi and Keiichiro Nayuki and Yoshikazu Sasaki and Itaru Honma",
note = "Funding Information: This research work was financially supported by Japan Society for the Promotion of Science (JSPS, Grant No. PU15903 ), Japan. Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) and Core Technology Consortium for Advanced Energy Devices, Tohoku University , Japan. This work was partially supported by ALCA - SPRING (ALCA-Specially Promoted Research for Innovative Next Generation Batteries) from Japan Science and Technology Agency (JST). Appendix A Funding Information: This research work was financially supported by Japan Society for the Promotion of Science (JSPS, Grant No. PU15903), Japan. Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) and Core Technology Consortium for Advanced Energy Devices, Tohoku University, Japan. This work was partially supported by ALCA-SPRING (ALCA-Specially Promoted Research for Innovative Next Generation Batteries) from Japan Science and Technology Agency (JST). Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",
year = "2020",
month = jan,
doi = "10.1016/j.ssi.2019.115136",
language = "English",
volume = "344",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",
}