Designing of reinforced two-dimensional molybdenum sulfoselenide microspheres by SnS quantum flakes with N-doped carbon for high performance half/full lithium-ion batteries

초록

Though two-dimensional metal chalcogenides are a promising anode material for Li-ion batteries owing to their high theoretical capacity, they exhibit poor cycling stability and inferior rate performance due to their structural deterioration caused by huge volume change during the repeated cycling. Herein, we report extra-small tin sulfide quantum flakes with nitrogen-doped carbon over two-dimensional molybdenum sulfoselenide microspheres (SnS QFs/NC@MoSSe) to improve the lithium ion-storage capability. The exclusive design of SnS QFs/NC@MoSSe endows the heterostructure with the large surface area, improves charge storage kinetics, maintains robust structural stability and exaggerates ion storage ability. An initial discharge capacity of 962 mAh g−1 is obtained at 100 mAg−1 with good cycling stability (1026 mAhg−1 after 100 cycles) and superior rate capability (628 mAhg−1 at 2000 mA g−1). The full cell with SnS QFs/NC@MoSSe anode and LiNi0.8Co0.1Mn0.1O2 cathode exhibits good cycling performance with a capacity retention of 90.0% after 300 cycles at 0.5 C rate. Our work provides the feasible design of anchoring/infusing quantum-sized active materials into the various two-dimensional structures for the development of high-performance anode materials for advanced Li-ion batteries.

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