MOF-derived, N-doped porous carbon coated graphene sheets as high-performance anodes for lithium-ion batteries

Abstract

N-doped porous carbon coated graphene (rGO) sheets (denoted as NPCGS) have been synthesized through a facile pyrolysis of an in situ grown zeolitic imidazolate framework (ZIF) on graphene oxide (GO). When tested as an anode material for lithium-ion batteries, the NPCGS exhibited superior electrochemical performance with a specific capacity of 1040 mA h g⁻¹ after 200 cycles at a discharging current density of 0.5 A g⁻¹ and excellent rate performance. The fascinating electrochemical performance of the NPCGS can be attributed to the synergistic effect of NPC and graphene in terms of N-doping, rich porosity and high electrical conductivity. The novel N-doped porous carbon coated graphene sheet material can be extended for application in sensors, electronic devices, catalysts, hydrogen storage and other systems.