1 Materials Sciences Division, Lawrence Berkeley National Laboratory, CA 94270, USA. gceder@berkeley.edu.
2 Materials Sciences Division, Lawrence Berkeley National Laboratory, CA 94270, USA. gceder@berkeley.edu and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3 Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
4 Materials Sciences Division, Lawrence Berkeley National Laboratory, CA 94270, USA. gceder@berkeley.edu and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA and Department of Materials Science and Engineering, University of California Berkeley, Berkeley, CA 94270, USA.
We propose that Ti-containing post-spinels may offer a practically-accessible route to fast multivalent ion diffusion in close-packed oxide lattices, with the caveat that substantial thermodynamic driving forces for conversion reactions exist.