All-solid-state sodium (Na) batteries attract much attention for large-scale energy storage systems due to the abundant sodium resources, enhanced durability, and improved reliability of solid-state devices. Currently most investigations focus on the battery operations at room temperature and above, which cannot fit for the needs of many demanding situations, such as those in the military or aerospace where batteries are required to operate below room temperature. Nevertheless, literature detailing the low-temperature behavior of previously explored all-solid-state Na batteries is very sparse. Herein, we report a recently discovered superionic conductor Na3SbS4, which shows remarkable ionic conductivity of 0.16 mS cm-1 at -25 oC. Furthermore, we found that Na3SbS4 maintains the tetragonal phase down to -253 oC and exhibits excellent cycling stability with Na metal at low temperature (-25 oC). This finding addresses a major barrier of the poor battery performance at decreased temperatures by taking advantage of the high ionic conductivity and low activation energy in tetragonal Na3SbS4 solid electrolyte.

Tetragonal Na3SbS4 electrolyte for all-solid-state sodium batteries operating below room temperature

255th National Meeting (2018)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.