Abstract
Layer SnS2 has been garnered significant attention for next-generation lithium-ion batteries (LIBs), due to its abundant resources and high theoretical capacity. However, the low initial Coulombic efficiency, large volume expansion and structural degradation have significantly hindered its application in LIBs. Herein, the layer Sn0.7(MoFeCoNiV)0.3S2 nanosheets (HE3-SnS2) grown on the conductive substrate carbon cloth (CC) is synthesized by one-step hydrothermal method. Multiple elements doping strategy not only increases the conformational entropy which will improve the structural stability of during cycling, but also enlarges the interlayer spacing which benefits for lithium-ion transfer. As a result, the additive-free integrated CC@HE3-SnS2 electrode achieves a high reversible specific capacity of 1204.9 mAh g−1 with a high initial Coulombic efficiency of 94.7 % at 1C, and maintains 1011.4 mAh g−1 after 100 cycles. Specifically, the CC@HE3-SnS2 anode exhibits excellent rate capability of 670.8 mAh g−1 at 10C. Moreover, the full cell based on CC@HE3-SnS2 anode and commercial LiCoO2 cathode displays a stable capacity retention of 862.7 mAh g−1 after 100 cycles at 1C. The entropy-stabilized SnS2-based anode with high initial Coulombic efficiency and rate capability has a competitive candidate for LIBs.
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