A Lithium Amide-Borohydride Solid-State Electrolyte with Lithium-Ion Conductivities Comparable to Liquid Electrolytes

5 years ago

A Lithium Amide-Borohydride Solid-State Electrolyte with Lithium-Ion Conductivities Comparable to Liquid Electrolytes

Daniel Rentsch, Eduardo Cuervo Reyes, Ruben-Simon Kühnel, Yigang Yan, Corsin Battaglia, Zbigniew Łodziana, Léo Duchêne, Arndt Remhof

High ionic conductivity of up to 6.4 × 10−3 S cm−1 near room temperature (40 °C) in lithium amide-borohydrides is reported, comparable to values of liquid organic electrolytes commonly employed in lithium-ion batteries. Density functional theory is applied coupled with X-ray diffraction, calorimetry, and nuclear magnetic resonance experiments to shed light on the conduction mechanism. A Li4Ti5O12 half-cell battery incorporating the lithium amide-borohydride electrolyte exhibits good rate performance up to 3.5 mA cm−2 (5 C) and stable cycling over 400 cycles at 1 C at 40 °C, indicating high bulk and interfacial stability. The results demonstrate the potential of lithium amide-borohydrides as solid-state electrolytes for high-power lithium-ion batteries. A lithium amide-borohydride superionic solid-state electrolyte with conductivities exceeding 10−3 S cm−1 near room temperature is developed. Integrated in an Li4Ti5O12-based half-cell, a high rate performance and stable cycling over 400 cycles at 1 C is achieved, demonstrating its potential as electrolyte for high-power lithium-ion batteries.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700294