title: Mitigated phase transition during first cycle of a Li-rich layered cathode studied by in operando synchrotron X-ray powder diffraction.
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.
authors.affiliation: MBLEM, Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK. alexander.korsunsky@eng.ox.ac.uk.
authors.forename: Bohang
authors.initials: B
authors.lastname: Song
authors.affiliation: Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK.
authors.forename: Sarah J
authors.initials: SJ
authors.lastname: Day
authors.affiliation: MBLEM, Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK. alexander.korsunsky@eng.ox.ac.uk.
authors.forename: Tan
authors.initials: T
authors.lastname: Sui
authors.affiliation: National University of Singapore, Department of Mechanical Engineering, Singapore.
authors.forename: Li
authors.initials: L
authors.lastname: Lu
authors.affiliation: Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK.
authors.forename: Chiu C
authors.initials: CC
authors.lastname: Tang
authors.affiliation: MBLEM, Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK. alexander.korsunsky@eng.ox.ac.uk.
authors.forename: Alexander M
authors.initials: AM
authors.lastname: Korsunsky