In this paper, Cu-doped Li 2 Zn 1−x Cu x Ti 3 O 8 (x = 0, 0.05, 0.1, 0.15) were successfully prepared using titanate nanowires as a precursor. The effects of Cu-doping on the physicochemical properties of Li 2 ZnTi 3 O 8 were extensively investigated by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscope (SEM), galvanostatic charge-discharge testing, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results show that the Li 2 Zn 1−x Cu x Ti 3 O 8 (x = 0, 0.05, 0.1, 0.15) compounds are pure well-crystallized spinel phase. In addition, the Cu-doping does not change the morphology and the electrochemical reaction process of Li 2 ZnTi 3 O 8 . Galvanostatic charge-discharge testing denotes that the Li 2 Zn 0.9 Cu 0.1 Ti 3 O 8 exhibits highest discharge capacity among all the samples and show higher cyclic stability and better rate capability compared with pristine Li 2 ZnTi 3 O 8 . When charge-discharge current density increases up to 1000 mA g −1 , the Li 2 Zn 0.9 Cu 0.1 Ti 3 O 8 sample still maintains a capacity of 165.4 mA h g −1 , while the pristine Li 2 ZnTi 3 O 8 sample shows severe capacity decline at same current density. CV result reveals that the Li 2 Zn 0.9 Cu 0.1 Ti 3 O 8 has the lowest polarization. It is shown by EIS that the Li 2 Zn 0.9 Cu 0.1 Ti 3 O 8 exhibits higher diffusion coefficient of Li + . The superior cycling performance and good rate capability, as well as simple synthesis route of the Cu-doped Li 2 ZnTi 3 O 8 are expected to show a potential commercial application.
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