Entropy enhancement drived high initial Coulombic efficiency and capacity integrated SnS2 nanosheets for lithium-ion batteries
Layer SnS 2 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 Sn 0.7 (MoFeCoNiV) 0.3 S 2 nanosheets (HE3-SnS 2 ) 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-SnS 2 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-SnS 2 anode exhibits excellent rate capability of 670.8 mAh g −1 at 10C. Moreover, the full cell based on CC@HE3-SnS 2 anode and commercial LiCoO 2 cathode displays a stable capacity retention of 862.7 mAh g −1 after 100 cycles at 1C. The entropy-stabilized SnS 2 -based anode with high initial Coulombic efficiency and rate capability has a competitive candidate for LIBs.
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