Thursday, 23 June 2016
Riverside Center (Hyatt Regency)
Driven by the need to access higher energy densities beyond those offered by Li-ion batteries, rechargeable Mg batteries have been receiving increased interests. Although Mg metal is not competitive with Li metal on both specific capacity (2205 mAh g-1 vs. 3862 mAh g-1 for lithium) and redox potential levels (-2.3 V compared to -3.0 V for Li vs. NHE), it was found to be non-dendritic. In addition, Mg metal has a high volumetric capacity (3833 vs. 2046 mAh cm-3 for Li), and offers an opportunity for battery cost reductions owing its abundance in the earth crust (5th most abundant element). However, several technical challenges that hamper realizing practical rechargeable Mg batteries are currently present. For example, the absence of robust and practical high voltage/high capacity cathodes currently limits the energy density which could be harnessed using these systems.[1] Another major hurdle is caused by the type of electrolytes currently used in Mg batteries. At its very core, is the limitation induced by the incompatibility of Mg metal with simple ionic salts and non-ethereal solvents. This has limited the working electrolytes options to a handful of complex halogen systems which are corrosive. We have been pioneering the development of a new family of electrolytes based on a novel bottom-up design strategy to create highly performing simple type highly compatible Mg salts. Herein, we will explain our design concepts that guided the development of a new paradigm using boron-hydrogen salts and resulted in demonstrating the only ionic simple-type salts known to date that are highly compatible with Mg metal.[2,3]
References
[1] a) R. Mohtadi, F. Mizuno Beilstein J. Nanotechnol. 2014, 5, 1291–1311, b) H. D. Yoo, I. Shterenberg, Y. Gofer, G. Gershinsky, N. Pour, D. Aurbach, Energy Environ. Sci. 2013, 6, 2265-2279.
[2] a) R. Mohtadi, M. Matsui, T. S. Arthur, S.-J. Hwang, Angew. Chem. Int. Ed. 2012, 51, 9780 –9783; b) T. J. Carter, R. Mohtadi, T. S. Arthur, F. Mizuno, R. Zhang, S. Shirai, J. W. Kampf, Angew. Chem. Int. Ed. 2014, 53, 3173-3177, c) O. Tutusaus, R. Mohtadi, ChemElectroChem. 2014DOI: 10.1002/celc.201402207;
[3] O. Tutusaus, R. Mohtadi, T. Arthur. F. Mizuno, Angew. Chem. Int. Ed. 2015, DOI: 10.1002/anie.201412202R3.