GeO2/ZnWO4@CNT nanocomposite as a novel anode material for lithium-ion battery

Single-walled carbon nanotube (SWCNT) wrapped GeO2/ZnWO4 nanocomposite was prepared by single-step solvothermal method. In this work, GeO2/ZnWO4 nanocomposites were prepared by varying the molar percentage of GeO(2)and by further adding SWCNT for the composite to boost the electrochemical performance. The prepared GeO2/ZnWO4 nanocomposites and GeO2/ZnWO4@CNT nanocomposite are used as anode material for lithium-ion battery (LIB). As expected, GeO2/ZnWO4@CNT nanocomposite exhibits higher capacities and good rate capability than the GeO2/ZnWO(4)nanocomposite. The GeO2/ZnWO4@CNT nanocomposite exhibits 930 mAh g(-1)discharge capacity and 533 mAh g(-1)charge capacity for the initial cycle at 100 mAh g(-1) in the voltage range of 0.01-3 V (vs. Li+/Li). Even at high current density of 500 mAh g(-1), GeO2/ZnWO4@CNT nanocomposite shows 231 mAh g(-1)and 257 mAh g(-1) charge/discharge capacity which are higher than that of GeO2/ZnWO4 nanocomposite. The GeO2/ZnWO4@CNT nanocomposite delivers 75.8% capacity retention and 100% coulombic efficiency even after 400 cycles at 300 mAh g(-1). These results direct that GeO2/ZnWO4@CNT nanocomposite is a good negative electrode for lithium-ion battery.