Design principles for solid-state lithium superionic conductors

Yan Wang, William Davidson Richards, Shyue Ping Ong, Lincoln J. Miara, Jae Chul Kim, Yifei Mo, Gerbrand Ceder

Research output: Contribution to journalArticlepeer-review

1181 Scopus citations

Abstract

Lithium solid electrolytes can potentially address two key limitations of the organic electrolytes used in today € s lithium-ion batteries, namely, their flammability and limited electrochemical stability. However, achieving a Li + conductivity in the solid state comparable to existing liquid electrolytes (>1 mS cm-1) is particularly challenging. In this work, we reveal a fundamental relationship between anion packing and ionic transport in fast Li-conducting materials and expose the desirable structural attributes of good Li-ion conductors. We find that an underlying body-centred cubic-like anion framework, which allows direct Li hops between adjacent tetrahedral sites, is most desirable for achieving high ionic conductivity, and that indeed this anion arrangement is present in several known fast Li-conducting materials and other fast ion conductors. These findings provide important insight towards the understanding of ionic transport in Li-ion conductors and serve as design principles for future discovery and design of improved electrolytes for Li-ion batteries.

Original languageEnglish
Pages (from-to)1026-1031
Number of pages6
JournalNature Materials
Volume14
Issue number10
DOIs
StatePublished - 24 Oct 2015

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