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

DOI: 10.1039/C5CP04801J DOI Help
PMID: 26799191 PMID Help

Authors: Bohang Song (University of Oxford) , Sarah J. Day (Diamond Light Source) , Tan Sui (University of Oxford) , Li Lu (National University of Singapore) , Chiu C. Tang (Diamond Light Source) , Alexander M Korsunsky (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Chemistry Chemical Physics , VOL 18 , PAGES 4745 - 4752

State: Published (Approved)
Published: January 2016

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.

Subject Areas: Physics, Chemistry

Instruments: I11-High Resolution Powder Diffraction