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Long‐Term Cycling Performance of Nitrogen‐Doped Hollow Carbon Nanospheres as Anode Materials for Sodium‐Ion Batteries
Author(s) -
Wen Yanfen,
Wang Bei,
Luo Bin,
Wang Lianzhou
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201501172
Subject(s) - anode , chemistry , electrolyte , carbon fibers , nitrogen , chemical engineering , doping , ion , current density , sodium , inorganic chemistry , electrode , materials science , organic chemistry , composite material , composite number , optoelectronics , physics , quantum mechanics , engineering
Nitrogen‐doped hollow carbon nanospheres (N‐HCSs) were prepared by a facile template method with dopamine as the precursor and subsequently used as the anode material for sodium‐ion batteries. The N‐HCSs demonstrated high reversible capacities with a retained capacity of 162.2 mA h g –1 over 100 cycles at 0.1 A g –1 and an excellent rate capability with an attainable capacity of 90 mA h g –1 at a high current density of 5 A g –1 . Detailed characterization revealed that nitrogen doping introduces defects into the carbon wall structure and enables the storage of additional Na ions in the walls of the carbon spheres. We then show that the addition of an electrolyte additive [fluorinated ethylene carbonate (FEC)] also effectively enhances the cyclability of the N‐HCSs anode; a capacity of 136.4 mA h g –1 was obtained after 2500 charge–discharge cycles at a current rate of 0.2 A g –1 .