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

doi:10.1039/c5cp04801j

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

Phys Chem Chem Phys. 2016 Feb 14;18(6):4745-52. doi: 10.1039/c5cp04801j.

Authors

Bohang Song¹, Sarah J Day², Tan Sui¹, Li Lu³, Chiu C Tang², Alexander M Korsunsky¹

Affiliations

¹ MBLEM, Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK. alexander.korsunsky@eng.ox.ac.uk.
² Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK.
³ National University of Singapore, Department of Mechanical Engineering, Singapore.

PMID: 26799191
DOI: 10.1039/c5cp04801j

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.

Publication types

Research Support, Non-U.S. Gov't