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Hidden structural and chemical order controls lithium transport in cation-disordered oxides for rechargeable batteries

Research output: Contribution to journalArticle

Author(s)

Huiwen Ji, Alexander Urban, Daniil A. Kitchaev, Deok-Hwang Kwon, Nongnuch Artrith, Colin Ophus, Wenxuan Huang, Zijian Cai, Tan Shi, Jae Chul Kim, Haegyeom Kim, Gerbrand Ceder

School/Research organisations

Abstract

Structure plays a vital role in determining materials properties. In lithium ion cathode materials, the crystal structure defines the dimensionality and connectivity of interstitial sites, thus determining lithium ion diffusion kinetics. In most conventional cathode materials that are well-ordered, the average structure as seen in diffraction dictates the lithium ion diffusion pathways. Here, we show that this is not the case in a class of recently discovered high-capacity lithium-excess rocksalts. An average structure picture is no longer satisfactory to understand the performance of such disordered materials. Cation short-range order, hidden in diffraction, is not only ubiquitous in these long-range disordered materials, but fully controls the local and macroscopic environments for lithium ion transport. Our discovery identifies a crucial property that has previously been overlooked and provides guidelines for designing and engineering cation-disordered cathode materials.
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Details

Original languageEnglish
Article number592
Number of pages9
JournalNature Communications
Volume10
DOIs
Publication statusPublished - 5 Feb 2019

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