Abstract
This study presents the application of magnetron sputtering for the conformal coating of lithium phosphorus oxynitride (LiPON) onto lithium-rich manganese oxide (LRM) materials, aiming to enhance their electrochemical performance through a cost-effective and time-efficient strategy. The LRM with approximately 0.058 % mass loading of LiPON coating (LRM-2) exhibited remarkable reversible capacities of 173.9 mAh/g and 192.5 mAh/g over 200 cycles at 25 °C and 60 °C, respectively, under 1 C charge/discharge current density. Comprehensive characterization studies revealed that LiPON modification significantly improved lithium ionic conductivity, interfacial ion transport kinetics, and interface compatibility with the electrolyte. The stable cathode-electrolyte interface effectively mitigated structural damage to LRM particles, suppressed interfacial oxygen release-induced phase transformation, and stabilized the material’s microstructures. Our sputtering-based conformal coating strategy is easily accessible and low-cost, with significant commercial application potential, offering a promising universal approach for enhancing the electrochemical performance of LRM cathode powder materials.
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