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 Na+ 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.