Passivation of Spinel Cathode Surface through Self-Segregation of Iron
The Manthiram Lab has developed an iron-doped, high-voltage cathode based on lithium nickel manganese oxide that results in extended cyclability and improved electrochemical performance. The cathode’s spinel structure enables 3-D Li+-ion diffusion and direct metal-metal interaction across the shared octahedral edges, which supports high power capability for HEV and PHEV applications at high operating voltages (> 4.3 V vs. Li/Li+). The iron-enrichment on the cathode surface prevents surface-electrolyte instability at these high operating voltages.