ZnWO4/SnO2@r-GO nanocomposite as an anode material for high capacity lithium ion battery

Abstract

Lithium ion battery (LIB) is widely used energy storage device. Herein, we report the preparation of ZnWO<inf>4</inf>/SnO<inf>2</inf> nanocomposite and ZnWO<inf>4</inf>/SnO<inf>2</inf>@r-GO nanocomposite via solvothermal method. The structural, elemental and morphological properties of the prepared samples are characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDAX), high-resolution transmission electron microscopy (HR-TEM), Brunauer-Emmett-Teller (BET) measurements, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) techniques. The prepared samples are tested as an anode for LIB. The ZnWO<inf>4</inf>/SnO<inf>2</inf> (5%) nanocomposite delivers initial discharge capacity of 882 mAh g?1 at a current density of 100 mA g?1, while, the specific capacity increases with the increase of SnO<inf>2</inf> upto 10% tested in present case. Further, ZnWO<inf>4</inf>/SnO<inf>2</inf>@r-GO nanocomposite exhibits a discharge capacity of 1486 mAh g?1 which is higher than that of ZnWO<inf>4</inf>/SnO<inf>2</inf> nanocomposite. In addition, after 500 cycles ZnWO<inf>4</inf>/SnO<inf>2</inf>@r-GO nanocomposite exhibits 89.8% cycle life and 98% of discharge capacity retention. These results indicate that, ZnWO<inf>4</inf>/SnO<inf>2</inf>@r-GO nanocomposite is a promising anode material for LIB. © 2020 Elsevier Ltd