Synthesis of novel anode Li4Ti5O12/C with PAN as carbon source and its electrochemical performance

A newly carbon-doped Lithium titanate (Li4Ti5O12/C) spinel-type composite material was routinely prepared by a simple solid-state reaction method using carbonization of polyacrylonitrile (PAN) as carbon source in an inert atmosphere. Impedance measurement shows that the resistance of the composite electrode is substantially lower than that of the pure one. Electrochemical performances of the prepared materials were investigated. Results indicate that the composite materials obtained with 10 wt.% PAN shows relatively higher specific capacity, better cycling and higher rate performance. The first discharge specific capacity of 158 mAh g−1, 138 mAh g−1, and 121 mAh g−1 were obtained at 0.2 C rate, 1/3 C rate, and 3 C rate at room temperature, respectively. And it was also found that tap density of the Li4Ti5O12/C composite reaches 1.51 g cm−3, which is higher than that of the pure one (1.13 g cm−3).

► PAN was used as carbon source in the preparation of Li4Ti5O12/C composite. ► Doping with PAN can reduce the resistance of the composite material. ► Li4Ti5O12/C composite with 10 wt.% PAN shows the best performance. ► Its specific capacity reaches 158 mAh g−1 at 0.2 C and can be cycled at 3 C.