Abstract
We have developed a LiBH4–C60 nanocomposite that displays fast lithium ionic conduction in the solid state. The material is a homogeneous nanocomposite that contains both LiBH4 and a hydrogenated fullerene species. In the presence of C60, the lithium ion mobility of LiBH4 is significantly enhanced in the as-prepared state when compared to pure LiBH4. We also observed that after the material is annealed, the lithium ion mobility is further enhanced. The magnitude of enhancement in lithium ion mobility of the annealed material is comparable to that previously observed for LiX (X = halide) addition to LiBH4. In a LiBH4:C60 70:30 wt % sample that was annealed, we measured Li ionic conductivity of 2.0 × 10–5 S/cm at 25 °C and 2.0 × 10–3 S/cm at 140 °C. Constant current cycling demonstrated that the material is stable in the presence of metallic lithium electrodes. First-principles calculations were also performed to demonstrate how C60 perturbs the interaction of lithium with the borohydride anion yielding a p...
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