摘要
As a promising candidate for next generation energy storage devices, lithium sulfur (Li-S) batteries still confrant rapid capacity degradation and low rate capability. Herein, we report a well-architected porous nitrogen-doped carbon/MnO coaxial nanotubes (MnO@PNC) as an efficient sulfur host material. The host shows excellent electron conductivity, sufficient ion transport channels and strong adsorption capability for the polysulfides, resulting from the abundant nitrogen-doped sites and pores as well as MnO in the carbon shell of MnO@PNC. The MnO@PNC-S composite electrode with a sulfur content of 75 wt.% deliveries a specific capacity of 802 mAh·g^-1 at a high rate of 5.0C and outstanding cycling stability with a capacity retention of 82% after 520 cycles at 1.0C.
基金
the National Natural Science Fund for Distinguished Young Scholars (No. 51425204)
the National Natural Science Foundation of China (Nos. 51521001 and 51702247)
the National Key Research and Development Program of China (No. 2016YFA0202603)
the Programme of Introducing Talents of Discipline to Universities (No. B17034)
the Fundamental Research Funds for the Central Universities (WUT: 2016111001, 2017111009, 2017111005, 2017111030).