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From anti-perovskite to double anti-perovskite: tuning lattice chemistry to achieve super-fast Li+ transport in cubic solid lithium halogen-chalcogenides

Abstract

Using a materials genome approach on the basis of the density functional theory, we have formulated a new class of inorganic electrolytes for fast diffusion of Li+ ions, through fine-tuning of lattice chemistry of anti-perovskite structures. Systematic modelling has been carried out to elaborate the structural stability and ion transportation characteristics in Li3AX based cubic anti-perovskite, through alloying on the chalcogen lattice site (A) and alternative occupancy of the halogen site (X). In addition to identifying effective ways for reduction of diffusion barriers for Li+ ions in anti-perovskite phases via suitable designation of lattice occupancy, the current theoretical study leads to discovery and synthesis of a new phase with a double-anti-perovskite structure, Li6OSI2 (or Li3O0.5S0.5I). Such a new compound is of fairly low activation barrier for Li+ diffusion, together with a wide energy band gap to hinder conduction of electrons.

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Publication details

The article was received on 02 Oct 2017, accepted on 05 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08698A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    From anti-perovskite to double anti-perovskite: tuning lattice chemistry to achieve super-fast Li+ transport in cubic solid lithium halogen-chalcogenides

    Z. Wang, H. Xu, M. Xuan and G. Shao, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08698A

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