Ti-based anode materials with the nominal compositions Li 4 Ti 5 Cu x O 12+ x (x=0, 0.075, 0.15, 0.3, 0.6, 1.20 and 1.67) were synthesized at 800°C by a solid-state reaction process. X-ray diffraction analysis indicated that the sintered samples were composed of intergrown spinel-type Li 4 Ti 5 O 12 and Li 2 CuTi 3 O 8 , and a small amount of Li 2 O. Scanning electron microscopy, electrical resistance measurement and galvanostatic cell cycling were also employed to characterize the structure and properties of the double spinel samples. It is proposed that the first lithiation of the component Li 2 CuTi 3 O 8 leads to the in situ production of Cu that can significantly improve the rate performance of Li 4 Ti 5 Cu x O 12+ x . The optimal nominal composition is Li 4 Ti 5 Cu 0.15 O 12.15 .