Cr-Doped Li2ZnTi3O8 as a High Performance Anode Material for Lithium-Ion Batteries

Li 2 ZnTi 2.9 Cr 0.1 O 8 and Li 2 ZnTi 3 O 8 were synthesized by the liquid phase method and then studied comparatively using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), galvanostatic charge–discharge testing, cyclic stability testing, rate performance testing, and electrochemical impedance spectroscopy (EIS). The results showed that Cr-doped Li 2 ZnTi 3 O 8 exhibited much improved cycle performance and rate performance compared with Li 2 ZnTi 3 O 8 . Li 2 ZnTi 2.9 Cr 0.1 O 8 exhibited a discharge ability of 156.7 and 107.5 mA h g −1 at current densities of 2 and 5 A g −1 , respectively. In addition, even at a current density of 1 A g −1 , a reversible capacity of 162.2 mA h g −1 was maintained after 200 cycles. The improved electrochemical properties of Li 2 ZnTi 2.9 Cr 0.1 O 8 are due to its increased electrical conductivity.