Whither Mn Oxidation in Mn-Rich Alkali-Excess Cathodes?
Source abstract
Abstract
Lithium-rich NMC (LR-NMC) compounds exhibit high capacities beyond the traditional redox, but it remains unclear whether the anomalous charge compensation mechanism is due to oxidized lattice oxygen or migration-assisted Mn oxidation. We compare LR-NMC with a model Mn7+ system (KMnO4) using a combination of resonant inelastic X-ray scattering (RIXS) irradiation studies and operando X-ray absorption spectroscopy/X-ray diffraction (XAS/XRD) to quantify transition metal (TM) migration, Mn oxidization, and beam-induced effects. We reveal how for KMnO4 it is possible to observe beam-induced Mn reduction resulting in trapped molecular oxygen. For LR-NMC, we observe negligible evidence for Mn oxidation while stabilized tetrahedral sites correlate more with a reduced TM environment. Finally, the additional spectroscopic structures observed in oxidized oxygen RIXS for LR-NMC are absent for gas-phase molecular oxygen.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Semiconductor materials and devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
NorthEast Center for Chemical Energy Storage at Binghamton University, Binghamton, New York 13902, United States
Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, New York 11794, United States
Department of Physics, Binghamton University, Binghamton, New York 13905, United States
Department of Nano Engineering, University of California San Diego (UCSD), La Jolla, California 92093, United States
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
WMG, University of Warwick, Coventry CV4 7AL, United Kingdom
Funding
Basic Energy Sciences · Office of Science
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