| 초록 |
SnS2, a 2D layered transition metal dichalcogenide, is well studied as anode in lithium ion battery. However, it undergoes huge volume change during charging / discharging cycles. As a result its capacity fades with the increasing cycles. Composites of SnS2 with graphene deliver improved capacity and rate performance. Nevertheless, these composites rarely achieve theoretical (645 mAh/g) capacity of SnS2. In the present work, 3D macroporous nanostructures were achieved through the composite formation of SnS2 with reduced graphene oxide (RGO) and graphitic carbon nitride (g-C3N4). Several composites were synthesized by varying the amount of g-C3N4. Crystal phase, morphology and compositions of the composites were established through several characterization techniques and their lithium storage properties were evaluated. It showed that the specific capacity depends on the amount of N in the composites. High specific capacity and good rate performance were achieved in the ternary composite which otherwise was not possible in the binary composites. The ternary composites exhibit high specific capacity at high current densities like 1000 mA/g and 2000 mA/g. Moreover, ternary composites display good rate performance at different current densities and capacity retained when the current density comes back to the starting value. |
