Abstract
The electrolyte erosion on the surface of active electrode material is recognized as a critical factor affecting the electrochemical performance of LiNixCoyMn1 − x − yO2 cathode materials. In this study, a LiF-modified LiNi0.8Co0.1Mn0.1O2 (LNMC811) cathode material was successfully constructed via wet chemical method by heating treatment. Electron microscopy and energy-dispersive X-ray spectroscopy studies prove that a LiF coating layer (approximately 10 nm) is tightly wrapped on the LNMC811 surface. Consequently, the LiF-modified LNMC811 shows amazing rate capability and wonderful cycling retention, presenting 90% and 75% of the initial discharge capacity at 1 C and 2 C after 100 cycles, respectively, in contrast with 52% capacity retention for bare LNMC811. The wonderful electrochemical property of LNMC811@LiF is caused by the incorporation of the LiF layer which helps to inhibit the deleterious side reactions between the electrolyte and active materials.
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