Mitigated phase transition during first cycle of a Li-rich layered cathode studied by in operando synchrotron X-ray powder diffraction

Bohang Song, Sarah J. Day, Tan Sui, Li Lu, Chiu C. Tang, Alexander M. Korsunsky

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

In operando synchrotron X-ray powder diffraction (SXPD) studies were conducted to investigate the phase transition of Li-rich Li(Li0.2Ni0.13Mn0.54Co0.13)O2 and Cr-doped Li(Li0.2Ni0.13Mn0.54Co0.03Cr0.10)O2 cathodes during the first charge/discharge cycle. Crystallographic (lattice parameters) and mechanical (domain size and microstrain) information was collected from SXPD full pattern refinement. It was found that Cr substitution at Co-site benefits in suppressing the activation of Li2MnO3 domains upon 1st charge, and thus mitigates the phase transition. As a consequence, Cr-doped layered cathode holds a better reversibility in terms of a full recovery of both lattice parameters and nano-domain size after a whole charge/discharge cycle. The effects of different cycling rates on the structural change were also discussed.

Original languageEnglish
Pages (from-to)4745-4752
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number6
DOIs
Publication statusPublished - 2016
Externally publishedYes

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