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Kinetic Limitations in Cycled Nickel-Rich NCM Cathodes and Their Effect on the Phase Transformation Behavior
journal contribution
posted on 2020-02-21, 20:34 authored by Simon Schweidler, Lea de Biasi, Pascal Hartmann, Torsten Brezesinski, Jürgen JanekLayered lithium transition-metal
oxides of the general formula
Li1+x(Ni1–y–zCoyMnz)1–xO2 (NCM or NMC) represent a promising class of cathode active
materials for Li-ion battery applications. However, especially Ni-rich
NCMs, enabling high capacity and energy density, tend to undergo more
severe degradation during cycling than low and medium Ni materials.
In this work, the kinetics of phase transitions in cycle-aged Li1+x(Ni0.85Co0.1Mn0.05)1–xO2 (NCM851005)
upon electrochemical (de)lithiation have been studied by operando X-ray diffraction. The focus is set on the onset of kinetic impairment,
evident from the coexistence of differently delithiated phases for
cell voltages greater than ∼4.1 V after ≥150 cycles,
to examine if the behavior observed with NCM851005 is analogous to
the H2–H3 transformation in isostructural LiNiO2.
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cell voltagesNi 0.85 Co 0.1 Mn 0.05delithiated phasesNCM 851005Kinetic LimitationsCycled Nickel-Rich NCM CathodesNi-rich NCMsLi-ion battery applicationsoperando X-ray diffractionmedium Ni materialsenergy densityphase transitionsisostructural LiNiO 2NMCPhase Transformation Behavior Layered lithium transition-metal oxides
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