Hydrothermal Synthesis of Hierarchical Hollow Li(Ni0.8Co0.15Al0.05)O-2 Microspheres for Lithium Ion Batteries

摘要

Li(Ni0.8Co0.15Al0.05)O-2 (NCA) cathode material for lithium ion batteries is synthesized by calcining Ni-Co-Al hydroxide or carbonate hydroxide hydrate precursor, which is obtained by hydrothermal method, and the NCA cathode material is hierarchical hollow microspheres with the diameter in the range of 3-5 mu m and composed of nanoflakes and/or nanowires. The effect of hydrothermal reaction time on the morphologies and the crystalline quality of the NCA cathode material is investigated on the basis of scanning electron microscopy, X-ray diffraction, and tunneling electron microscopy. The NCA cathode material shows smooth and monotonous charge/discharge characteristics, delivers a reversible capacity as 144.4 mAh/g and retains 90.4% after 50 cycles at a current density of 0.1 C between 2.5 and 4.3 V.