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LiNi0.5Co0.2Mn0.3O2 (NCM523) was coated by a lithium-ion conductor Li3PO4 layer using a pre-coating treatment and solid state method. The physicochemical characteristics were investigated by XRD, SEM, TEM and XPS.

Li3PO4 coating layer maintained the crystal structure of NCM523 cathode. The cathode with 3.0 wt% Li3PO4 coating (P0.03-NCM) exhibited outstanding rate capability (169.3 mAh g􀀀 1 at 0.2 C) and cycling retention of 92.23% at 1 C after 150 cycles, whereas the pristine NCM exhibited a capacity retention of only 77.84%. The electrochemical performance of the full-cell (P0.03-NCM as the cathodes and graphite as the anodes) showed high cycle retention of 82.92% after 100 cycles. The Li3PO4 coating layer acted as a physical barrier and alleviated the degradation behaviors of NCM523. This research work provided insights for the commercial application of ternary layered cathodes.

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