Abstract
A uniform nanocoating can substantially enhance the electrochemical properties of cathode materials. Herein, we report that a uniform AlPO4 coating can be produced on the surface of LiNi0.8Co0.15Al0.05O2 (NCA) particles by a homogeneous precipitation method, which was confirmed by scanning electron microscopy and energy dispersive x-ray spectroscopy. After being heated, the AlPO4 was converted to the Li3PO4 which was verified by x-ray diffraction. The heated AlPO4 coated NCA demonstrated a substantially enhanced electrochemical performance. The capacity retention increased from 87.38% for bare NCA to 94.28% for the heated 1 wt.% AlPO4 coated NCA sample. Moreover, the reversible capacity at 5 C increased from 80 mAh/g for bare NCA to 120 mAh/g for the heated 1 wt.% AlPO4-coated NCA. In addition, improved thermal stability was also found. The start temperature of thermal runaway increased from 175.12°C for bare NCA to 200.32°C for the heated 1 wt.% AlPO4-coated NCA.
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The research was financially supported by the Sichuan Provincial Key Technology R&D Program (2016GZ0299).
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Zhang, X., Liu, G., Li, S. et al. Preparation of a Homogeneous Li3PO4 Coating and Its Effect on the Electrochemical Properties of LiNi0.8Co0.15Al0.05O2. J. Electron. Mater. 48, 4443–4451 (2019). https://doi.org/10.1007/s11664-019-07223-5
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DOI: https://doi.org/10.1007/s11664-019-07223-5