Kyumin Kim

Cathode vs Electrolyte: Decoupling the Origins of Degradation in High-Voltage Ni-Rich Lithium-Ion

Raising the upper cutoff voltage and deploying Ni-rich layered oxides (e.g., NMC811) are promising routes to higher lithium-ion cell energy density. However, the origin of degradation remains unclear at high-voltage operation. We propose using a cycle-relevant scan rate (1.0 mV s−1) cyclic voltammetry in a three-elec...