Abstract
Lithium thioborates are promising fast Li-ion conducting materials, with similar properties to their lithium thiophosphate counterparts that have enabled the development of solid-state Li-ion batteries. By comparison, thioborates have scarcely been developed, however, offering new space for materials discovery. Here we report a new class of lithium thioborate halides that adopt a so-called supertetrahedral adamantanoid structure that houses mobile lithium ions and halide anions within interconnected 3D structural channels. Investigation of the structure using single-crystal XRD, neutron powder diffraction, and neutron PDF reveals significant lithium and halide anion disorder. The phases are non-stoichiometric, adopting slightly varying halide contents within the materials. These new superadamantanoid materials exhibit high ionic conductivities up to 1.4 mS cm−1, which can be effectively tuned by the polarizability of the halide anion within the channels.
| Original language | English |
|---|---|
| Pages (from-to) | 6975-6980 |
| Number of pages | 6 |
| Journal | Angewandte Chemie - International Edition |
| Volume | 60 |
| Issue number | 13 |
| DOIs | |
| State | Published - Mar 22 2021 |
Funding
This research was supported by the BASF International Scientific Network for Electrochemistry and Batteries. The authors also thank Natural Sciences and Engineering Research Council of Canada (NSERC) for generous support via their Canada Research Chair and Discovery Grant programs to L.F.N., and a CGS‐D doctoral graduate scholarship to K.K. Neutron powder diffraction measurements used resources at the Spallation Neutron Source (POWGEN and NOMAD instruments), a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.
Keywords
- lithium-ion conductors
- neutron diffraction
- solid electrolytes
- supertetrahedra
- thioborate
