Study of the Effect of F-Doping on Lithium Electrochemical Behavior in MnWO 4 Anode Nanomaterials

MnWO4 nanorods with different contents of F-doping were synthesized by a facile approach. The morphological studies further confirmed formation of MnWO4 nanorod structure with dimensional size and length of 50 and 100 nm, respectively. The differences of Li-storage performance that caused by F-doping contents in MnWO4 nanomaterials were systematically investigated. The results show by tuning the F-doping contents in the MnWO4 nanorods, both the reversible capacity and the cycling stability of nano-MnWO4 electrode attain remarkable improvement. Furthermore when the content of F-doping is 0.05 mol%, the reversible capacity for lithium storage in nano-MnWO4 is at its maximum. What makes that all the more remarkable is that the 0.05 mol% F-doped nano-MnWO4 shows a long cycle life. Even cycled under a low current density (200 mA h g−1), the capacity retention still can keep more than 85% after 150 cycles, which are much superior to the report ones. These results provide insight into the effective method which can easily be applied to improve the electrochemical performances of the advanced electrode materials for Li ion batteries.