Remineralization constructs stable surfaces to enhance the cycling stability of Li-rich Mn-based cathode

Abstract

Li-rich layered oxides (LRMs) cathode materials offer excellent initial energy density due to the contribution of cation/anion redox chemistry. However, during the cycling process, the irreversible phase transitions occurred in the materials lead to rapid degradation of voltage and capacity. To address this issue, we adopted a modification method by treating the surface of LRMs with carbon–fluorine surfactants, combined with high-temperature calcination to enhance the stability of the surface structure. The results indicate that the modified material exhibits improved cycle stability. After 300 cycles at 1C (1C = 250 mA g⁻¹), the capacity retention rate reaches 91.7 %, and the voltage decay is effectively suppressed. The improved electrochemical performance is attributed to the formation of strong transition metal-fluorine (TM-F) bonds, which inhibit the TM migration and maintain the intact layered structure during cycling. This strategy provides a new path for efficient surface structure modification of high-energy–density cathodes.