Synthesis Of 3D Hierarchical MoS₂ Nanoarchitectures For Lithium Ion Batteries Property

Due to its advantages such as splitting of layer structure and easy peeling,molybdenum disulfide?MoS₂?has become another typical 2D material following the graphene.However,the unstable structure and poor electrical conductivity of MoS₂ materials greatly restrict its application as the cathode material for lithium ion batteries.In this paper,the electrochemical properties of MoS₂ materials are improved by modifying MoS₂ with conductive carbon material.?1?In this experiment,core-shell MoS₂ spheres have been prepared by solvothermal method,the lithium storage properties of hybrid materials with different graphene contents at low current and high current were studied.The electrochemical results showed that the hybrid material with 7.0 wt%graphene exhibited ca.922 mAh/g after 100 cycles under the current density of 200 mA/g.MSA-3 maintained the capacity of 682.4,667.9 and 564.2 mAh/g after200 cycles at 500,1000 and 2000 mA/g,respectively.The electrochemical properties of the core-shell MoS₂ coated with carbon were studied,the results show that the surface carbon coating is not ideal to enhance the lithium storage performance.?2?By regulating the growth environment of the MoS₂ microspheres,fullerene MoS₂spheres have been prepared.Carbon-coated MoS₂@C hybrid materials were prepared by annealed with the help of glucose as carbon source.By regulating the amount of glucose added,hybrid materials with carbon thickness of 3.6,10 and 20 nm were prepared of the hybrid materials with optuium carbon content?15.9 wt%?showed the most excellent electrochemical performance.and the discharge capacity was about 862 mAh/g after 600cycles at 1000 mA/g current density.It can still maintain 127%of the discharge capacity relative to the 6^th.?3?MoS₂@C hybrid materials with homogeneous MoS₂ and C incorporation have been designed and synthesized with one-step method.Propylene glycol,which play the roles of solvent and carbon source,were successfully applied to construst hybrid material.The hollow structure is conducive to the diffusion of electrolyte,and the homogeneous doping of conductive carbon materials could endow easing the volume change of active materials in the process of lithium inlay/lithium removal,and accelerat the electron transfer.The electrochemical results suggested that the hollow MoS₂ maintained 1214.0 and 234.7 mAh/g after 200/1000 cycles at the current density of 200 mA/g and 5000 mA/g.After cycling 1000times at current densities of 10 and 20 A/g,the average discharge capacities could keep 223.4and 92.2 mAh/g.