The Structure Design And Property Study Of Carbon Modified MoS₂ Anode With High Performances

When Molybdnum disulfide?MoS₂?is used as LIBs anode,it exhibits large-current charge/discharge capability and wide operation temperature region.In spite of these advantages,the volume expansion and low electronic conductivity during the charge/discharge process still limit its further development.Based on these shortcomings,this paper explores various methods to design two different structures of MoS₂-based materials applied for LIBs anode.The electrochemical performances have been measured by means of galvanostatic method,cyclic voltammetry?CV?and electrochemical spectroscopy?EIS?.The present work is mainly divided into the following aspects.The N-CNT/MoS₂@C recycled paper?N-M-RP film?freestanding electrode featuring“point-line-plane”structure was prepared via vauucm filtration method.The mixed spherical MoS₂@C and linear N-CNT suspension was filtrated into the prepared recycled paper.The fabricated N-M-RP film was directly used as LIBs anode without further process.Benefiting for the advantages of synergic effect between the functional materials and 3D recycled paper,the N-M-RP film exhibits the excellent electrochemical performances(990 mAh g^-1).The N-RP film delivers normal capacity as the CNT-cellulose paper performs(280 mAh g^-1).While the M-RP film is totally incapable of functioning as a negative material for LIBs for its poor discharge capacity(0 mAh g^-1).At high current density of 500 mAh g^-1,the N-M-RP electrode maintains high discharge specific capacity of 740 mAh g^-11 after 200 cycles.The“point-line-plane”structure make full use of the advantages of the funtional materials and RP,demostrating excellent electrochemical performances.The MoS₂/graphene fiber coaxial nanotube was synthesized by a facile hydrothermal method.The MoS₂/graphene fiber coaxial nanotube exhibits several significant advantages:one is constructing an effective conductive network inside the N-M-RP film.Another is the graphene fiber in the composite constructs a good buffer matrix accommodating the volume change of MoS₂ during repeated conversion reactions.When it was used as an anode material in LIBs.At a high current density of1 A g^-1,the N-G-M still remains capacity of 398 mAh g^-1;at 100 mA g^-1,the N-G-M,G-M and pristine MoS₂ deliver the capacity of 600 mAh g^-1,361 mAh g^-11 and 107mAh g^-1,respectively.All in all,the as-prepared MoS₂/graphene fiber coaxial nanotube revealed an excellent cycling stability and high rate capability.