Combination of uniform SnO2 nanocrystals with nitrogen doped graphene for high-performance lithium-ion batteries anode

A composite of well dispersed SnO2 nanocrystals adhered on N-doped graphene (containing 18 at% N atoms) by g-CNx coating is obtained through facile hydrothermal process and followed by high temperature treatment, which displays obviously improved electrochemical properties as an anode material in LIBs. Respectively, dicyandiamide and sulfourea are selected as the Nitrogen source and surfactant for preparing high conductive carbonic matrix and well dispersed SnO2 nanocrystals. A stable reversible capacity could be achieved which is upto 803 mAh g(-1), after 80 cycles due to the uniformity of SnO2 particles in nano-scale and firmly bonding onto N-doped graphene matrix. (C) 2015 Elsevier B.V. All rights reserved.