The effect of vanadium precursors on the electrochemical performance of Li_(1.1)V_(0.9)O_2 as an anode material for Li-ion batteries

摘要

Recently, Li_(1.1)V_(0.9)O_2 has been considered as one of the most promising anode materials for Li-ion batteries due to its high volumetric capacity at a relatively low intercalation potential. For a scalable and economical production of Li_(1.1)V_(0.9)O_2 anode material with a high electrochemical performance, however, the preparation of vanadium precursor with a good quality is of crucial importance. In this work, a high-purity V_2O_3 precursor was prepared through a thermal reduction of commercial V_2O_5 at 600℃, which is far more cost-effective than V_2O_3. Li_(1.1)V_(0.9)O_2 was synthesized by a simple solid-state reaction of Li_2CO_3, as well as V_2O_3 at high temperature under a reducing atmosphere. In the electrochemical measurement, Li_(1.1)V_(0.9)O_2 prepared using V_2O_3 from the thermal reduction of V_2O_5 showed considerably higher specific capacity than the one using the commercial V_2O_3, maintaining a specific capacity of about 300 mAh g~(-1) even after 20 cycles at 0.1 C rate, although it showed a lower coulombic efficiency for the first cycle.