High magnesium mobility in ternary spinel chalcogenides

Pieremanuele Canepa (), Shou-Hang Bo (), Gopalakrishnan Sai Gautam, Baris Key, William D. Richards, Tan Shi, Yaosen Tian, Yan Wang, Juchuan Li and Gerbrand Ceder ()
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Pieremanuele Canepa: Lawrence Berkeley National Laboratory
Shou-Hang Bo: Lawrence Berkeley National Laboratory
Gopalakrishnan Sai Gautam: Lawrence Berkeley National Laboratory
Baris Key: Argonne National Laboratory
William D. Richards: Massachusetts Institute of Technology
Tan Shi: University of California Berkeley
Yaosen Tian: University of California Berkeley
Yan Wang: Massachusetts Institute of Technology
Juchuan Li: Lawrence Berkeley National Laboratory
Gerbrand Ceder: Lawrence Berkeley National Laboratory

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Magnesium batteries appear a viable alternative to overcome the safety and energy density limitations faced by current lithium-ion technology. The development of a competitive magnesium battery is plagued by the existing notion of poor magnesium mobility in solids. Here we demonstrate by using ab initio calculations, nuclear magnetic resonance, and impedance spectroscopy measurements that substantial magnesium ion mobility can indeed be achieved in close-packed frameworks (~ 0.01–0.1 mS cm–1 at 298 K), specifically in the magnesium scandium selenide spinel. Our theoretical predictions also indicate that high magnesium ion mobility is possible in other chalcogenide spinels, opening the door for the realization of other magnesium solid ionic conductors and the eventual development of an all-solid-state magnesium battery.

Date: 2017
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DOI: 10.1038/s41467-017-01772-1

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