Dopamine derived nitrogen-doped carbon sheets as anode materials for high-performance sodium ion batteries

Designed as an anode material for sodium ion batteries, nitrogen-doped carbon sheets (NCSs) were successfully synthesized using graphene and dopamine as template and carbon precursor, respectively. The NCSs demonstrate high reversible capacity and excellent rate performance, delivering a high reversible capacity of 382 mAh g(-1) at 50 mA g(-1) after 55 cycles. Even up to 10 A g(-1), a rate capacity of 75 mAh g(-1) can be obtained. Furthermore, NCSs also have remarkable cycling stability with specific capacity of 165 mAh g(-1) after 600 cycles (under 200 mA g(-1)). The excellent performance of NCSs can be ascribed to the nitrogen-doped two-dimension sheet structure. (C) 2015 Elsevier Ltd. All rights reserved.