Controllable Preparation Of Rhenium Sulfide Heterostructures And Their Sodium/potassium Storage Properties

Lithium-ion batteries,representing excellent energy storage batteries,have been extensively studied in the decades since they gained commercialization,and nowadays the long-term consumption of lithium has brought certain obstacles to the development of lithium-ion batteries.Meanwhile,sodium ion batteries(SIBs)and potassium ion batteries(PIBs)are gradually attracting the attention and research of scientists.Both the abundance of natural resources,the similar battery operation mechanism,and the transport properties as carriers indicate the development potential of SIBs and PIBs.The design and application of high-performance anode materials remain the key to the development of SIBs/PIBs.Therefore,the research of a high-performance,low-cost anode material for sodium ion batteries is now one of the main research topics.The high efficiency performance and application potential of metal sulfides and metal selenides as anode materials for SIBs and PIBs,but also the large volume expansion caused by the transformation reaction of metal sulfides and metal selenides in SIBs and PIBs is known from previous reports.The structural design of materials and compounding with compounds can effectively improve the defects of the materials themselves,so this work also explores the heterogeneous structure of compounds and compounds to enhance the electrochemical properties of the materials.In this work,compounds with different morphological structures are selected to synthesize heterostructures with two-dimensional sheet rhenium sulfide to show the superiority of the material according to the electrochemical properties of the heterostructures.(1)Metal-organic frameworks(MOFs)derived metal compound structures have great potential to become high-quality substrates due to their highly ordered porous structures,which can also enhance the contact between electrolyte and electrode.In the first work,the three-dimensional metal-organic framework MIL-88 was used as a precursor,and after sulfidation,the porous Fe S₂ polyhedra were formed,and ReS₂ nanosheets were grown and arranged on the surface to form a heterogeneous structure.The nanosheets on the surface of the polyhedra ensure sufficient contact between the electrolyte solution and the electrode material,while shortening the ion transport path.(2)Carbon wrapping is also an important tool in heterostructures.The outer wrapped carbon layer not only improves the overall electrical conductivity of the material but also increases the mechanical stress of the material,making the material structure more stable.In the second work,a one-dimensional linear structure of Mn O-NW precursor was chosen to form a heterogeneous material Mn Se-NW@C@ReS₂ with ReS₂ after wrapping the carbon layer.(3)Non-metal atom doping is also an effective strategy to improve electrochemical properties by tuning the electron/ion state of the target,which lowers the diffusion energy barrier and improves the inherent electrical conductivity in the electrode material.Therefore,we doped Se in three-dimensional Bi₂S₃ to improve the electrical conductivity,while growing anisotropic ReS₂ nanosheets on the surface to form a unique nano structure(Bi₂S_3-xSe_x@ReS₂)with good durability and excellent Na⁺/K⁺storage capacity.