Preparation of FePO4 by liquid-phase method and modification on the surface of LiNi0.80Co0.15Al0.05O2 cathode material

A general liquid-phase technology is hired to prepare uniform distribution, high crystallinity nano-FePO4, which is coated on the surface of LiNi0.80Co0.15Al0.05O2 (NCA) to adjust the interface property of electrode. The crystal structure of NCA is relatively complete before and after coating. Surface modification by FePO4 improves the cycling and thermal stability of NCA materials effectively. The initial specific discharge capacity is 181 mAhg(-1), 180 mAhg(-1), 180 mAhg(-1), and 166 mAhg(-1), corresponding to the pristine and the coating contents of 1 wt%, 2 wt%, and 3 wt%. The capacity retention can keep over 85.82% for the sample coated content of 2 wt% after 100 cycles. It also exhibit good rate capacity performance even at 5C. The Electrochemical impedance spectroscopy (EIS) analysis reveals the charge transfer resistance is reduced by coating and the cycle performance is improved. Therefore, the NCA electrode coated with nano-FePO4 shows enhanced electrochemical performance. (C) 2017 Elsevier B.V. All rights reserved.