Understanding Chemomechanical Li-ion Cathode Degradation through Multi-Scale, Multi-Modal X-ray Spectromicroscopy

Elucidating the Origins of Rapid Capacity Fade in Hybrid Garnet-Based Solid-State Lithium Metal Batteries

“…This finding suggests that some primary particles are initially over-delithiated and not restored to their fully lithiated state after 1 cycle, indicating the poor cycling stability and increased overpotential of the NMC 622 in the hybrid system . Additionally, the chemical phase heterogeneity and the evolution of the internal strain might have exacerbated microstructural changes in the electrode. , …”

“…33 Additionally, the chemical phase heterogeneity and the evolution of the internal strain might have exacerbated microstructural changes in the electrode. 38,39 3.4. Heterogeneous Phase Distribution of Discharged NMC 622 after 28 Cycles.…”

Guiding the Design of Heterogeneous Electrode Microstructures for Li‐Ion Batteries: Microscopic Imaging, Predictive Modeling, and Machine Learning

“…[60,173,174,177,178] Compositional heterogeneities have been reported also in NMC and nickel cobalt aluminum oxide (NCA), [179][180][181] both at high C-rates, [181] which can be induced by autocatalytic reaction kinetics, [182] and in agglomerate particle as a consequence of internal stress. [183,184] There exist at least two consolidated theories to model phaseseparating materials, namely the sharp interface model and the phase-field model. The sharp interface model considers Li-rich and Li-poor areas as individual phases, separated by a sharp interface that moves as one phase grows at the expenses of the other one; in pseudo-2D battery modeling, this approach has largely been framed in terms of shrinking core modeling [147,[185][186][187] which, however, does not capture the physics of phase separation realistically.…”