On the Unusually High Fe3+/Fe2+ Redox Potential Exceeding 4V

Wednesday, 8 October 2014: 13:30
Sunrise, 2nd Floor, Galactic Ballroom 2 (Moon Palace Resort)
A. Yamada (The University of Tokyo, ESICB, Kyoto University), S. C. Chung (The University of Tokyo), S. Nishimura (The University of Tokyo, ESICB, Kyoto University), and P. Barpanda (Indian Institute of Science)
The potential tunability for Fe3+/Fe2+ redox couple at unusually high voltage region of 3.5 – 4.1 V will be reviewed based on the new materials discovered in my group over the past 3 years. Overall energetics will be given by decomposing the thermodynamic definition into electronic and structural factors, leading to the guidelines to develop new high voltage cathode materials. In searching new materials, as often missed by the ground state screening, experimental identification of metastable functional phase by entropy gain (including disorder and/or defects) at finite temperature is important and effective. Very promising new cathode materials led by this concept will be introduced as time permits.