N-doped CMK-3 anchored with SnS2 nanosheets as anode of lithium ion batteries with superior cyclic performance and enhanced reversible capacity

Abstract

The composites of N-doped ordered mesoporous carbon (N-CMK-3) anchored with tin disulfide (SnS2) nanosheets (NSs) have been synthesized via a maneuverable hot bath method at low temperature. The as-synthesized SnS2@N-CMK-3 composites exhibit a hierarchical structure with two dimensional (2D) SnS2 nanosheets uniformly grown on N-CMK-3, leading to a large specific area (126.7 m2 g−1) with mesoscale porosity. As anode material for lithium ion batteries (LIBs), SnS2@N-CMK-3 composite exhibits a high initial capacity of 1438.9 mA h g−1 (200 mA g−1). Moreover, the electrochemical performance remained at 618.9 mA h g−1 after 200 cycles, which are significantly higher than that of the pristine SnS2. The outstanding electrochemical properties might be due to the 2D nanosheet-morphology feature of SnS2 and the addition of N-CMK-3 that could availably inhibit the agglomeration of active substances and raise the conductivity of the composite electrode.