Premium
A Lithium Oxythioborosilicate Solid Electrolyte Glass with Superionic Conductivity
Author(s) -
Kaup Kavish,
Bazak J. David,
Vajargah Shahrzad Hosseini,
Wu Xiaohan,
Kulisch Joern,
Goward Gillian R.,
Nazar Linda F.
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201902783
Subject(s) - materials science , electrolyte , fast ion conductor , amorphous solid , conductivity , ionic conductivity , faraday efficiency , anode , chemical engineering , lithium (medication) , grain boundary , ion , metallurgy , crystallography , chemistry , electrode , microstructure , medicine , engineering , endocrinology , physics , quantum mechanics
As potential next‐generation energy storage devices, solid‐state lithium batteries require highly functional solid state electrolytes. Recent research is primarily focused on crystalline materials, while amorphous materials offer advantages by eliminating problematic grain boundaries that can limit ion transport and trigger dendritic growth at the Li anode. However, simultaneously achieving high conductivity and stability in glasses is a challenge. New quaternary superionic lithium oxythioborate glasses are reported that exhibit high ion conductivity up to 2 mS cm −1 despite relatively high oxygen: sulfur ratios of more than 1:2, that exhibit greatly reduced H 2 S evolution upon exposure to air compared to Li 7 P 3 S 11 . These monolithic glasses are prepared from vitreous melts without ball‐milling and exhibit no discernable XRD pattern. Solid‐state NMR studies elucidate the structural entities that comprise the local glass structure which dictates fast ion conduction. Stripping/plating onto lithium metal results in very low polarization at a current density of 0.1 mA cm −2 over repeated cycling. Evaluation of the optimal glass composition as an electrolyte in an all‐solid‐state battery shows it exhibits excellent cycling stability and maintains near theoretical capacity for over 130 cycles at room temperature with Coulombic efficiency close to 99.9%, opening up new avenues of exploration for these quaternary compositions.