One-pot solvothermal synthesis 2D SnS2/CNTs hybrid as a superior anode material for sodium-ion batteries

Structural properties of active material play a fundamental role in determining electrochemical performance of sodium-ion battery anodes. In this work, SnS2/CNTs hybrids feature with different nanostructures (2D nanosheets and 3D self-assembled flowers) were synthesized through a facile time-dependent solvothermal approach. Meanwhile, the sodium storage performances of these hybrids were evaluated, and the structural-associated effects in term of diffusion coefficient and cycling stability were briefly discussed. Electrochemical tests reveal that 2D hybrid with ultrathin SnS2 sheets acquired both improved electrons and Nathorn diffusion kinetics. As a result, enhanced cycling performance, cycling stability and rate capability were obtained. At a current density of 50 mA g(-1), the 2D hybrid electrode could deliver a discharge capacity of 476.3 mAh g(-1) after 100 cycles, which is 31.3% higher than that of 3D hybrid electrode. Even at 3200 mA g(-1), a discharge capacity of 265.5 mAh g(-1) still could be maintained for 2D hybrid electrode. Therefore, the as-prepared 2D SnS2/CNTs hybrid exhibits great prospect for application in SIBs anodes. (C) 2017 Elsevier B.V. All rights reserved.