Abstract
We report a new Li-superionic chloride, Li2Sc2/3Cl4, that crystallizes in a disordered spinel structure, and exhibits an ionic conductivity of 1.5 mS cm-1 with a low activation energy barrier for Li+ ion diffusion of 0.34 eV. This material is the first spinel-type superionic halide. Structural elucidation via powder neutron diffraction reveals a significantly disordered Li+-ion distribution over available tetrahedral and octahedral sites within the lattice, forming an infinitely 3D connected Li+ ion diffusion pathway comprised of face-sharing octahedra and tetrahedra. Due to the high oxidative stability of Li2Sc2/3Cl4, all solid state lithium batteries employing Li2Sc2/3Cl4 and high voltage cathodes (LiCoO2, LiNi0.6Mn0.2Co0.2O2 or high-Ni LiNi0.85Mn0.1Co0.05O2)-without any coating-exhibit excellent electrochemical performance up to 4.6 V in terms of capacity retention and cycle life.
| Original language | English |
|---|---|
| Pages (from-to) | 2056-2063 |
| Number of pages | 8 |
| Journal | Energy and Environmental Science |
| Volume | 13 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2020 |
Funding
This research was supported by the BASF International Scientific Network for Electrochemistry and Batteries. L. F. N. also thanks NSERC for generous support via their Canada Research Chair and Discovery Grant programs. We thank Kavish Kaup for powder neutron diffraction data collection. The neutron diffraction studies used resources at the Spallation Neutron Source (POWGEN instrument), a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.
| Funders | Funder number |
|---|---|
| BASF |
