Abstract
With the aim to develop high-performance sulfur electrode, manganese sulfide (MnS) was combined with sulfur/porous carbon composite electrode by a simple precipitation method. Both X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) results show that as-prepared MnS corresponds to Rambergite phase with a hexagonal structure (γ-MnS). MnS could be uniformly dispersed in the carbon matrix when the content was less than 20 wt%. When the content of MnS increased, γ-MnS particles aggregated on both outside of the mesoporous carbon channels and the surface of carbon particles. The CV curves of MnS/MC in the first cycle were similar to elemental sulfur, indicating partially decomposed MnS at the surface of mesoporous carbon. Charge/discharge tests indicated that the initial discharge-specific capacity of S/MnS/MC was 1412.5 mAh g−1 and remained a reversible capacity of 727.4 mAh g−1 after 50 cycles at a current of 100 mA g−1, which is superior to that of sulfur composite electrode without MnS.
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