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A new halospinel superionic conductor for high-voltage all solid state lithium batteries

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/D0EE01017K· OSTI ID:1657953
 [1];  [1];  [1];  [2];  [3];  [1]
  1. University of Waterloo, ON (Canada)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. BASF SE, Ludwigshafen (Germany)
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. Here, 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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1657953
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 7 Vol. 13; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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