Investigation of the Performance and Recession Mechanisms of High-Nickel Ternary Lithium-Ion Batteries Under Artificial Aging Discharge Rates

Using a series of electrochemical performance tests and post-mortem analysis, herein, the performance and aging mechanisms of high-nickel lithium-ion batteries after accelerated aging at different discharge rates are investigated. The results show that the loss of lithium ions and the generation of a solid electrolyte interphase are the main causes for capacity fading at relatively low aging discharge rates. When the aging rate increases to 3 C, the performance of the battery deteriorates significantly, and structural damage becomes the main reason for attenuation, which means that the aging mechanism changed. It is expected that this investigation will improve the safety performance of the retired high-nickel ternary lithium batteries.