材料科学
石墨烯
阳极
杂原子
退火(玻璃)
兴奋剂
掺杂剂
碳纤维
氮化物
化学工程
离子
氮化碳
纳米技术
电极
催化作用
复合材料
图层(电子)
复合数
光电子学
物理化学
有机化学
化学
工程类
光催化
戒指(化学)
作者
Jinlong Liu,Yaqian Zhang,Lei Zhang,Fangxi Xie,Anthony Vasileff,Shi‐Zhang Qiao
标识
DOI:10.1002/adma.201901261
摘要
Abstract Heteroatom‐doped carbon materials with expanded interlayer distance have been widely studied as anodes for sodium‐ion batteries (SIBs). However, it remains unexplored to further enlarge the interlayer spacing and reveal the influence of heteroatom doping on carbon nanostructures for developing more efficient SIB anode materials. Here, a series of N‐rich few‐layer graphene (N‐FLG) with tuneable interlayer distance ranging from 0.45 to 0.51 nm is successfully synthesized by annealing graphitic carbon nitride (g‐C 3 N 4 ) under zinc catalysis and selected temperature ( T = 700, 800, and 900 °C). More significantly, the correlation between N dopants and interlayer distance of resultant N‐FLG‐T highlights the effect of pyrrolic N on the enlargement of graphene interlayer spacing, due to its stronger electrostatic repulsion. As a consequence, N‐FLG‐800 achieves the optimal properties in terms of interlayer spacing, nitrogen configuration and electronic conductivity. When used as an anode for SIBs, N‐FLG‐800 shows remarkable Na + storage performance with ultrahigh rate capability (56.6 mAh g −1 at 40 A g −1 ) and excellent long‐term stability (211.3 mAh g −1 at 0.5 A g −1 after 2000 cycles), demonstrating the effectiveness of material design.
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