The low-temperature (400 °C) coating of few-layer graphene on porous Li4Ti5O12via C28H16Br2 pyrolysis for lithium-ion batteries

Abstract

Porous Li4Ti5O12 coated with few-layer graphene was prepared via the low-temperature pyrolysis of C28H16Br2 at 400 °C. The coating layer was very thin and uniform. The coated sample shows superior Li storage performance compared with the as-prepared sample. Capacities of 131 and 104 mA h g−1 can be reached at current rates of 5 and 10 C, respectively. Moreover, cyclic performance is significantly improved after coating. The capacity decreases from 144.6 to 124.4 mA h g−1 after 2400 cycles at a current rate of 2 C in a half cellversusLi/Li+, with high capacity retention of 86%.