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

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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.

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

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Article information


Submitted
01 Apr 2020
Accepted
09 Jun 2020
First published
10 Jun 2020

Energy Environ. Sci., 2020, Advance Article
Article type
Communication

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, Advance Article , DOI: 10.1039/D0EE01017K

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