关键词: 钠离子电池；二硫化钼；导电碳；水热法；电化学性能

Abstract: Conductive carbon?鄄loaded MoS2（MoS2@C） nanosheets were prepared by hydrothermal method，which significantly improved the cycle stability and rate performance of MoS2：under a current density of 0.1 A/g，the reversible specific capacity was still as high as 466.3 mA·h/g and the capacity retention rate was up to 90.6% after 100 cycles.Under a current density of 10 A/g，the reversible specific capacity was up to 321.5 mA·h/g. After a long cycle of 500 times，under a current density of1 A/g，the reversible specific capacity was 313 mA·h/g without capacity decay.This was because MoS2@C composite structure could improve the diffusion efficiency of electrons and sodium ions in the composite material and could inhibit the agglome?鄄ration of MoS2.In addition，the small size of MoS2 could shorten the transmission path of sodium ions and provided space for the expansion of the MoS2 volume.Through the kinetic analysis of the two electrodes，it was found that sodium ions had higher diffusion efficiency within MoS2@C electrode，and the pseudocapacitive control behavior was the main reason for the excellent rate performances of MoS2@C electrode.

Key words: sodium ion battery；molybdenum disulfide；conductive carbon；hydrothermal method；electrochemical properties