ZnWO4/r-GO nanocomposite as high capacity anode for lithium-ion battery

Abstract

The pristine ZnWO<inf>4</inf> and ZnWO<inf>4</inf>/r-GO nanocomposite synthesized by the facile solvothermal method were tested as anode materials for lithium-ion battery. Ex situ X-ray photoelectron spectroscopy (XPS) confirms the elemental composition of the pristine ZnWO<inf>4</inf> and ZnWO<inf>4</inf>/r-GO nanocomposite. The ZnWO<inf>4</inf>/r-GO nanocomposite shows mesoporous nature and exhibits 50.802 m2 g?1 BET specific surface area, which is higher than that of pristine ZnWO<inf>4</inf>. In addition, the electrochemical property of the pristine ZnWO<inf>4</inf> and ZnWO<inf>4</inf>/r-GO nanocomposite investigated using 2032 half-cell reveals that GO enhances the electrochemical property of the ZnWO<inf>4</inf>. The ZnWO<inf>4</inf>/r-GO nanocomposite not only exhibits higher discharge capacity of 1158 mAh g?1 at 100 mA g?1 but also shows longer and stable cycle life at 300 mA g?1 current density. The ZnWO<inf>4</inf>/r-GO nanocomposite exhibits 80.74% capacity retention even after 500 cycles. The synergetic effect of r-GO and ZnWO<inf>4</inf> improves the capacity, columbic efficiency, and stability of the material. The results indicate that ZnWO<inf>4</inf>/r-GO nanocomposite is an interesting anode material for Li-ion battery with higher capacity complemented with stability compared to pristine ZnWO<inf>4</inf>. [Figure not available: see fulltext.]. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.