Integrated 3D porous C-MoS2/nitrogen-doped graphene electrode for high capacity and prolonged stability lithium storage
Integrated 3D porous C-MoS2/nitrogen-doped graphene electrode for high capacity and prolonged stability lithium storage
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DOI：
10.1016/j.jpowsour.2015.07.074
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发表时间：
2015-11
影响因子：
9.2
通讯作者：
D. Xie;Wangjia Tang;X. Xia;Dong-huang Wang;D. Zhou;F. Shi;X. Wang;C. Gu;J. Tu
中科院分区：
文献类型：
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作者：
D. Xie;Wangjia Tang;X. Xia;Dong-huang Wang;D. Zhou;F. Shi;X. Wang;C. Gu;J. Tu
精细的负极材料设计和制备对于开发高性能锂离子电池具有重要意义。在此，我们报道了一种通过水热诱导自组装过程构建自支撑和无粘结剂的3D多孔碳涂覆的MoS 2/氮掺杂石墨烯（C-MoS 2/N-G）集成电极的简单策略。预成型的碳涂覆的MoS 2被牢固地锚定在多孔氮掺杂的石墨烯气凝胶结构上。作为锂离子电池的负极，C-MoS 2/N-G电极提供1600 mAh g− 1的高首次放电容量，并在200 mA g−1的电流密度下循环500次后保持900 mAh g − 1。令人印象深刻的是，C-MoS 2/N-G实现了上级高倍率性能，在4000 mA g−1的高电流密度下可逆容量为500 mAh g − 1。此外，通过非原位X射线光电子能谱和透射电子显微镜详细研究了所获得的集成电极的储锂机理。
Scrupulous design and fabrication of advanced anode materials are of great importance for developing high-performance lithium ion batteries. Herein, we report a facile strategy for construction of free-standing and free-binder 3D porous carbon coated MoS2/nitrogen-doped graphene (C-MoS2/N-G) integrated electrode via a hydrothermal-induced self-assembly process. The preformed carbon coated MoS2is strongly anchored on the porous nitrogen-doped graphene aerogel architecture. As an anode for lithium ion batteries, the C-MoS2/N-G electrode delivers a high first discharge capacity of 1600 mAh g−1and maintains 900 mAh g−1after 500 cycles at a current density of 200 mA g−1. Impressively, superior high-rate capability is achieved for the C-MoS2/N-G with a reversible capacity of 500 mAh g−1at a high current density of 4000 mA g−1. Furthermore, the lithium storage mechanism of the obtained integrated electrode is investigated by ex-situ X-ray photoelectron spectroscopy and transmission electron microscopy in detail.