First demonstration of reversible insertion of multivalent magnesium ions (Mg2+) into a spinel-type manganese oxide (Mn2O4), using multi-modal characterization
Significance and Impact
- Proof of Mg2+ insertion provides an avenue to designing a high voltage cathode for a magnesium-based battery that surpasses current lithium-ion technology
- Breakthrough enabled by JCESR Sprint establishing strategic collaborations on specific fundamental issues
- Reversible Mg intercalation into Mn2O4 observed in both aqueous and non-aqueous electrolytes. Results from four different tools provided insight at different scales.
- Reaction between Mn2O4 and MgMn2O4 observed at an average voltage of 2.9 V vs. Mg2+/Mg0. Theoretical specific energy: 783 Wh/kg (compared to 400 Wh/kg in today’s lithium-ion).
Work performed at the University of Illinois at Chicago and SLAC National Accelerator Laboratory (JCESR partners) and Argonne National Laboratory (JCESR managing partner) by C Kim, PJ Phillips, B Key, T Yi, D Nordlund, Y-S Yu, RD Bayliss, S-D Han, M He, AK Burrell, RF Klie and J Cabana, Advanced Materials