It is crucial to design advanced electrodes with large Li/Na-ion storage capacities for the development of next-generation battery systems. Herein, hierarchical MoS /C composite microspheres were constructed by facile template-free self-assembly sulfurization plus post-carbonization. Cross-linked MoS nanosheets and outer carbon layer are organically combined together to form composite microspheres with diameters of 400-500 nm. Due to enhanced electrical conductivity and good structural stability, the MoS /C composite microspheres exhibit substantially improved Li/Na-ion storage performance. Compared to unmodified MoS , MoS /C composite microspheres deliver higher Li/Na-ion storage capacity (Li : 1017 mA h g at 100 mA g and Na : 531 mA h g at 100 mA g ), as well as better rate capability (Li : 434 mA h g at 1 Ag and Na : 102 mA h g at 1 Ag ) and capacity retention (Li : 902 mA h g after 200 cycles and Na : 342 mA h g over 100 cycles). The superior Li/Na-ion storage performance is mainly attributed to the unique porous microsphere architecture with increased electrode/electrolyte interfaces and more diffusion paths for Li/Na ion insertion. Additionally, the carbon coating can not only improve the electronic conductivity, but also suppress the shuttle effect of polysulfides.
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