Mechanism of Degradation of Capacity and Charge/Discharge Voltages of High‐Ni Cathode During Fast Long‐Term Cycling Without Voltage Margin (Adv. Energy Mater. 29/2022)

Abstract

High-Nickel Cathodes In article number 2201151, Seung Min Kim, Wonyoung Chang and co-workers show that constant-voltage step following constant-current charging to high voltage (4.3 V) entails a periodic cation-mixed state in high-nickel cathode materials, which leads to significant deterioration in electrochemical performance. Only with constant-current charging, does the cathode material maintain its original structure with a non-periodic cation-mixed state. Thus, constant-voltage step should be avoided unless a sufficient voltage margin is maintained for high-nickel cathode materials.