We identified several compositions within the lithium-amide borohydride (Li(BH4)1-x(NH2)x) system that display near room temperature conductivities of >6 mS/cm, comparable to the ones of typical carbonate-based liquid electrolytes used in commercial lithium-ion batteries. An Li4Ti5O12 half-cell based on such an electrolyte displays >60% capacity retention at 3.5 mA/cm2 (5C) and stable cycling for 400 cycles. The mixed closo-borate Na2(B12H12)0.5(B10H10)0.5 displays a conductivity of 0.9 mS/cm at 20 °C, excellent thermal stability of up to 300 °C and an electrochemical stability window of 3 V that enables reversible plating of sodium. We will also report on the preparation and characterization of magnesium ethylenediamine borohydride (Mg(en)1(BH4)2), which displays a very high conductivity of 6x10-5 S/cm at 70 °C for a magnesium-ion solid-state electrolyte.
 Y. Yan, R.-S. Kühnel, A. Remhof, L. Duchêne, E. Cuervo Reyes, D. Rentsch, Z. Łodziana, C. Battaglia, Adv. Energy Mater., accepted.
 L. Duchêne, R.-S. Kühnel, D. Rentsch, A. Remhof, H. Hagemann, C. Battaglia, Chem. Commun. 2017, 53, 4195.
 E. Roedern, R.-S. Kühnel, A. Remhof, C. Battaglia, Sci. Rep. 2017, 7, 46189.