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

Laidong Zhou; Chun Yuen Kwok; Abhinandan Shyamsunder; Qiang Zhang; Xiaohan Wu; Linda F. Nazar

doi:10.1039/D0EE01017K

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

Laidong Zhou,

^a Chun Yuen Kwok,^a Abhinandan Shyamsunder,^a Qiang Zhang,

^b Xiaohan Wu^c and Linda F. Nazar

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry and the Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
E-mail: lfnazar@uwaterloo.ca

^b Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA

^c BASF SE, Ludwigshafen 67056, Germany

Abstract

We report a new Li-superionic chloride, Li₂Sc_2/3Cl₄, 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 Li₂Sc_2/3Cl₄, all solid state lithium batteries employing Li₂Sc_2/3Cl₄ and high voltage cathodes (LiCoO₂, LiNi_0.6Mn_0.2Co_0.2O₂ or high-Ni LiNi_0.85Mn_0.1Co_0.05O₂) – without any coating – exhibit excellent electrochemical performance up to 4.6 V in terms of capacity retention and cycle life.

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Article information

DOI: https://doi.org/10.1039/D0EE01017K
Article type: Communication
Submitted: 01 Apr 2020
Accepted: 09 Jun 2020
First published: 10 Jun 2020

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Energy Environ. Sci., 2020,13, 2056-2063

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

L. Zhou, C. Y. Kwok, A. Shyamsunder, Q. Zhang, X. Wu and L. F. Nazar, Energy Environ. Sci., 2020, 13, 2056 DOI: 10.1039/D0EE01017K

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Energy & Environmental Science

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

Abstract

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

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