Details

Autor(en) / Beteiligte

• Dawson, James A.
• Attari, Tavleen S.
• Chen, Hungru
• Emge, Steffen P.
• Johnston, Karen E.
• Islam, M. Saiful

Titel

Elucidating lithium-ion and proton dynamics in anti-perovskite solid electrolytes

Ist Teil von

• Energy & environmental science, 2018-01, Vol.11 (10), p.2993-3002

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• All-solid-state Li-ion batteries are currently attracting considerable research attention as they present a viable opportunity for increased energy density and safety when compared to conventional liquid electrolyte-based devices. The Li-rich anti-perovskite Li 3−x OH x Cl has generated recent interest as a potential solid electrolyte material, but its lithium and proton transport capabilities as a function of composition are not fully characterised. In this work, we apply a combination of ab initio molecular dynamics and 1 H, 2 H and 7 Li solid-state NMR spectroscopy to study the mobility of lithium ions and protons in Li 3−x OH x Cl. Our calculations predict a strongly exothermic hydration enthalpy for Li 3 OCl, which explains the ease with which this material absorbs moisture and the difficulty in synthesising moisture-free samples. We show that the activation energy for Li-ion conduction increases with increasing proton content. The atomistic simulations indicate fast Li-ion diffusion but rule out the contribution of long-range proton diffusion. These findings are supported by variable-temperature solid-state NMR experiments, which indicate localised proton motion and long-range Li-ion mobility that are intimately connected. Our findings confirm that Li 3−x OH x Cl is a promising solid electrolyte material for all-solid-state Li-ion batteries.