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Ultrahigh level nitrogen/sulfur co-doped carbon as high performance anode materials for lithium-ion batteries
- Qiu, Zhaozheng, Lin, Yemao, Xin, Hailin, Han, Pei, Li, Dongzhi, Yang, Bo, Li, Pengchong, Ullah, Shahid, Fan, Haosen, Zhu, Caizhen, Xu, Jian
- Carbon 2018 v.126 pp. 85-92
- anodes, electrochemistry, graphene, lithium batteries, micropores, nitrogen, sulfur
- Ultrahigh level nitrogen and sulfur co-doped disordered porous carbon (NSDPC) was facilely synthesized and applied as anode materials for lithium-ion batteries (LIBs). Benefiting from high nitrogen (14.0 wt%) and sulfur (21.1 wt%) doping, electrode fabricated from NS1/3 showed a high reversible capacity of 1188 mA h g−1 at 0.1 A g−1 in the first cycle with a high initial columbic efficiency (>75%). In addition, prolonged life over 500 cycles and excellent rate capability of 463 mA h g−1 at 5 A g−1 have been realized. The preeminent electrochemical performance is attributed to three effects: (1) the high level of sulfur and nitrogen; (2) the synergic effect of dual-doping heteroatoms in cooperation with each other; (3) the large quantity of edge defects and abundant micropores and mesopores that can provide extra Li storage regions. These unique features of NSDPC electrodes suggest that they can serve as a practical substitute for graphite as a high performance anode material in LIBs.