Ultra-high specific capacity of Cr3+-doped Li4Ti5O12 at 1.55 V as anode material for lithium-ion batteries

Cr3+-doped Li4Ti5O12 (LTO) was fabricated by spray drying followed by a solid-state reaction. The crystal structure and morphology of the sample was tested using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results show that Cr3+-doped LTO not only significantly improved the discharge specific capacity but also maintained the original 1.55-V discharge platform. During the process of discharge-charge, Cr3+-doped LTO showed a long discharge plateau (91.4% of the entire discharge process) at 1.55 V and an ultra-high initial discharge specific capacity of 240.6 mAh g(1) at 0.1 degrees C. Furthermore, it can maintain 144.7 mAh g (1) at 5.0 degrees C after 200cycles, which is 92% of its initial discharge capacity. (C) 2018 Elsevier B.V. All rights reserved.