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Chen, Ruiyong
University of Liverpool
in Cooperation with on an Cooperation-Score of 37%
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article
Superionic lithium transport via multiple coordination environments defined by two-anion packing
Abstract
<jats:p>Fast cation transport in solids underpins energy storage. Materials design has focused on structures that can define transport pathways with minimal cation coordination change, restricting attention to a small part of chemical space. Motivated by the greater structural diversity of binary intermetallics than that of the metallic elements, we used two anions to build a pathway for three-dimensional superionic lithium ion conductivity that exploits multiple cation coordination environments. Li<jats:sub>7</jats:sub>Si<jats:sub>2</jats:sub>S<jats:sub>7</jats:sub>I is a pure lithium ion conductor created by an ordering of sulphide and iodide that combines elements of hexagonal and cubic close-packing analogously to the structure of NiZr. The resulting diverse network of lithium positions with distinct geometries and anion coordination chemistries affords low barriers to transport, opening a large structural space for high cation conductivity.</jats:p>