Simple fabrication of nanocomposites of Bi2O3 and Bi2MoO6 for application as anode materials for high-performance lithium-ion battery
摘要
In this work, nanocomposites of Bi2O3 and Bi2MoO6 were successfully developed under simple synthesis conditions with low reaction temperature (< 100 ℃). The synthesized material denoted as BMO had a reaction time of only 5 min at room temperature and BMO_80 ℃ was synthesized at 80 °C for 2 h. Morphological examination from transmission electron microscopy images showed that the materials had sizes ranging from about 5–30 nm. When used as an anode for lithium-ion batteries, BMO_80 ℃ electrode demonstrated excellent electrochemical performance including a reversible capacity of 804.7 mAh g−1 at a current density of 0.1 A g−1 over 50 cycles and impressive fast-charging capability with retention of more than 92% of the capacity value when the current density increased from 0.1 A g−1 to 3 A g−1. In addition, the low resistance value obtained from electrochemical impedance spectroscopy measurements and overwhelming contribution of the pseudocapacitive behavior in energy storage was also noted. These excellent properties are due to the special characteristic of the BMO_80 ℃ material such as the size of 5 to 10 nm, the large energy storage capacity from the Bi2O3 and Bi2MoO6 phases, and the presence of Mo element with good electrical conductivity. These results demonstrate the high potential of BMO_80 ℃ as an anode material for lithium-ion battery.