Elevated thermal stress converts high-nickel cathode calendar loss from parabolic SEI growth into rapid non-linear decay through surface phase degradation.
Quantifying microstructural phase transition relaxation prevents mistaking mechanical lattice heat for parasitic oxidation, lowering projected ten-year battery warranty risks.
Anisotropic c-axis contraction in recycled high-nickel cathodes accelerates intergranular microcracking, requiring impurity controls and stress screening.
Resolving subsurface oxygen vacancy kinetics requires stabilizing the cathode surface lattice to prevent impedance spikes, thermal hazards, and transport bans.
Early cycle analytics fail to predict nonlinear battery degradation knees when sacrificial additives mask microstructural stress accumulation.
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