Constructing 2D SnS@C nanosheets anchored on interconnected carbon nanotube networks as advanced anode materials for lithium ion and sodium ion batteries

摘要

The huge volume change and sulfur dissolution during the repeated discharge/charge process is believed to be the main cause of fast capacity decay and poor rate capability of SnS for LIBs and SIBs. Here, SnS@C nanosheets anchored on interconnected CNT networks are designed and prepared as anode materials for LIBs and SIBs is reported. Thanks to the synergistic function between SnS nanosheets, CNT and carbon coating layers, the obtained SnS/CNT@C composite exhibits outstanding cycling/rate performance for LIBs and SIBs. Meanwhile, high specific capacity of 494.9 mAh g(-1) is maintained after 400 loops at 1.0 A g(-1), excellent rate performance (431 mAh g(-1) at 5.0 A g(-1)) is achieved for LIBs. Furthermore, SnS/ CNT@C composite also demonstrated a high reversible capacity (582.6 mAh g(-1) at 0.2 A g(-1) ) and long-term cycling performance (243.3 mAh g -1 is obtained after 400 loops at 0.5 A g (-1) ) for SIBs. (C) 2019 Elsevier B.V. All rights reserved.