Phosphorus and Nitrogen Dual-Doped Few-Layered Porous Graphene: A High-Performance Anode Material for Lithium-Ion Batteries
Phosphorus and Nitrogen Dual-Doped Few-Layered Porous Graphene: A High-Performance Anode Material for Lithium-Ion Batteries
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磷氮双掺杂少层多孔石墨烯：高性能锂离子电池负极材料
DOI：
10.1021/am503692g
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发表时间：
2014-08-27
影响因子：
9.5
通讯作者：
Gao, Jinsen
中科院分区：
文献类型：
--
作者：
Ma, Xinlong;Ning, Guoqing;Gao, Jinsen
以（NH4）(3)PO4为氮、磷源，采用mgo模板化学气相沉积（CVD）法制备了磷、氮双掺杂多孔石墨烯（PNG）的少层石墨烯网络。由于在CVD过程中掺杂与石墨烯生长同时发生，因此P和N原子被取代掺杂到石墨烯网络中。拉曼光谱表明，P和N原子加入石墨烯框架后，缺陷或紊乱的数量增加。x射线光电子能谱测定的P和N的掺杂水平分别为0.6%和2.6%。作为锂离子电池（LIBs）的阳极，PNG电极具有高可逆容量（在电流密度为50 mA g（-1）时为2250 mA h g(-1)），优异的倍率性能（在1000 mA g（-1）时为750 mA h g(-1)），以及令人满意的循环稳定性（在1500次循环后无容量衰减），与未掺杂的少层多孔石墨烯相比，电极性能得到了极大的提高。我们的研究结果表明，PNG是一种很有前途的高速率锂离子电池阳极材料。
Few-layered graphene networks composed of phosphorus and nitrogen dual-doped porous graphene (PNG) are synthesized via a MgO-templated chemical vapor deposition (CVD) using (NH4)(3)PO4 as N and P source. P and N atoms have been substitutionally doped in graphene networks since the doping takes place at the same time with the graphene growth in the CVD process. Raman spectra show that the amount of defects or disorders increases after P and N atoms are incorporated into graphene frameworks. The doping levels of P and N measured by X-ray photoelectron spectroscopy are 0.6 and 2.6 at %, respectively. As anodes for Li ion batteries (LIBs), the PNG electrode exhibits high reversible capacity (2250 mA h g(-1) at the current density of 50 mA g(-1)), excellent rate capability (750 mA h g(-1) at 1000 mA g(-1)), and satisfactory cycling stability (no capacity decay after 1500 cycles), showing much enhanced electrode performance as compared to the undoped few-layered porous graphene. Our results show that the PNG is a promising candidate for anode materials in high-rate LIBs.