摘要
The magnesium/lithium hybrid batteries(MLHBs)featuring dendrite-less deposition with Mg anode and Li-storage cathode are a promising alternative to Li-ion batteries for large-scale energy storage.However,their limited energy density limits their practical implementation.To improve this,beyond the commonly proposed intercalation compounds,high-capacity conversion-type cathodes based on heterostructures of tin sulphide-molybdenum disulphide(SnS_(2)-MoS_(2))are proposed in this work.Individual SnS_(2) is already a promising high-capacity electrode material for multivalent batteries and undergoes conversion reactions during the ion storage process.The introduction of S-deficient MoS_(2) enhances the reversibility of SnS_(2) in the conversion reaction via strong polysulfide anchoring and catalytic effect.Our results show that the SnS_(2)-MoS_(2) electrode achieves a high charge capacity of~600 mAhg^(-1) at 50mAg^(-1) and an excellent rate capability of 240mAhg^(-1) at 1000mAhg^(-1) with a negligible capacity fading rate of 0.063%per cycle across 1000 cycles.The results highlight a new direction toward designing 2D heterostructures as high-capacity cathodes beyond intercalation-type cathodes for multivalent-ion batteries.
基金
XF thanks the University of Queensland(UQ)for offering IPRS and UQ Centennial scholarships and the PhD research startup foundation of North University of China.The authors gratefully acknowledge the facilities and technical assistance of the Australian Microscopy and Microanalysis Research Facility at the UQ Centre for Microscopy and Microanalysis.This work was supported by the Australian Research Council(Project ARC FL170100101)
the Research Project Supported by Shanxi Scholarship Council of China(2021-128)
supported by the Fundamental Research Program of Shanxi Province(20210302124356).
