Fabrication of N-doped graphitic carbon nanosheets via reaction between CaC2 and g-C3N4 as promising Li-ions battery anode

Abstract

Nitrogen-doped carbon materials have attracted much attention for energy storage. Herein, we synthesize nitrogen-doped graphitic carbon nanosheets (NGCN) via a simple reaction between g-C3N4 and CaC2. The NGCN product integrates various features including high nitrogen content (3.98 at.%), large surface area (72.96 m2 g−1) and high graphitization degree (interplanar spacing, 0.335 nm). When served as anode material in Li-ions batteries, the NGCN exhibits a quite encouraging reversible capacity of 475 mAh g−1 at a current density of 500 mA g−1, with a capacity retention of 98.5 % after 1000 cycles. It also has an acceptable rate capability (238 mAh g−1 at 5000 mA g−1). This work promises an efficient route to convert sustainable carbon sources into nitrogen-doped graphitic carbon nanosheets with excellent electrochemical performances for energy storage.