Cr-Doped Li(2)ZnTi(3)O(8) 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.