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

Physical Chemistry Chemical Physics : PCCP
Bohang SongAlexander M Korsunsky

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.

References

Jun 29, 2006·Journal of the American Chemical Society·A Robert ArmstrongPeter G Bruce
Aug 7, 2009·The Review of Scientific Instruments·S P ThompsonC C Tang
Mar 8, 2011·Journal of the American Chemical Society·Naoaki YabuuchiShinichi Komaba
Jun 21, 2011·Journal of Synchrotron Radiation·Stephen P ThompsonChiu C Tang
Dec 2, 2014·Nature Materials·M SathiyaJ-M Tarascon

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Citations

Apr 26, 2017·Chemical Society Reviews·Wangda LiArumugam Manthiram
Apr 29, 2016·Physical Chemistry Chemical Physics : PCCP·Jicheng ZhangXiangfeng Liu

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