Abstract
Ti3C2Tx MXene has attracted great attention in lithium-sulfur batteries (LSBs) because of its multi-layer structure. However, the low adsorption strength between pure Ti3C2Tx and lithium polysulfides (LiPSs) causes inferior capacity. Surface modification is a promising methode to improve LiPSs adsorption strength of Ti3C2Tx.Herein, we report afast method for rationalsurface engineering of Ti3C2Tx in this paper. One-step plasma treatment strategy is applied to prepare nitrogen-doped Ti3C2Tx (Ti3C2Tx-N) in the first time. SEM and EDS mapping images show that the homogenous nitrogen doped on Ti3C2Tx. Due to the strong interaction between nitrogen in Ti3C2Tx with LiPSs along with high electronical conductivity, the S/MXene-N composite demonstrates excellent electrochemical performances, including high initial reversible capacity (1281.2 mAh g−1 at 0.5 C) and high cycling stability (420.3 mAh g−1 at 2.0 C after 1000 cycles). Overall this work offers a simple surface engineering strategy to manipulate Ti3C2Tx towards high-performance LSBs’ cathodes host.
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