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General synthesis of sulfonate-based metal-organic framework derived composite of MxSy@N/S doped carbon for high-performance lithium/sodium ion batteries.

Herein, a general and simple strategy has been realized for preparing metal sulfide (MxSy) nanoparticles immobilized into N/S co-doped carbon (NSC) via an one-step pyrolysis method for the first time, in which the organic ligand 1, 5-naphthalenedisulfonic acid in metal-organic framework (MOF) precursor is as a sulfur source, and metal ions are in situ sulfurized to form MxSy nanoparticles, results in formation of MxSy/NSC (M=Fe, Co, Cu, Ni, Mn, Zn) composites. Benefiting from the MxSy nanoparticles and conductive carbon, a synergistic effect of the composite has been achieved. For instance, the composite of Fe7S8/NSC as an anode displays excellent long-term cycling stability in lithium/sodium ion batteries. At 5 A g-1, large capacities of 645 mA h g-1 and 426.6 mA h g-1 can be retained after 1500 cycles for lithium-ion battery and after 1000 cycles for sodium-ion battery, respectively.