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Insight into the Synergistic Effect of N, S Co‐Doping for Carbon Coating Layer on Niobium Oxide Anodes with Ultra‐Long Life
Author(s) -
Cheng Xing,
Ran Fanmin,
Huang Yanfei,
Zheng Runtian,
Yu Haoxiang,
Shu Jie,
Xie Ying,
He YanBing
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202100311
Subject(s) - materials science , chemical engineering , coating , heteroatom , doping , anode , thiourea , composite number , conductivity , carbon fibers , oxide , inorganic chemistry , nanotechnology , electrode , composite material , metallurgy , organic chemistry , chemistry , engineering , ring (chemistry) , optoelectronics
Multi‐heteroatoms co‐doped carbon coating can significantly enhance the electronic conductivity and mass transfer rate of the electrode materials due to the synergistic effect. In this study N, S co‐doped carbon coating is introduced on the surface of niobium oxides (GNO@NSC) by using a convenient thiourea evaporation method. Theory calculations and experimental results confirm the synergistic effect of N, S co‐doping in GNO@NSC composite. N, S co‐doping not only enlarges the layer distance of the carbon materials but also leads to more activation sites for lithium storage; meanwhile, the introduction of the co‐doping carbon layer on GNO significantly enhances the bonding interaction with GNO, leading to excellent structural stability and conductivity of the composite. As a result, the GNO@NSC composite possesses excellent structural reversibility, a large specific capacity, and high‐rate performance. GNO@NSC nanowires deliver a highly reversible capacity of 288 mAh g –1 and display excellent cycling stability, and its capacity retention is 78.9% after 6000 cycles at a high current density of 1 A g –1 . This study reveals the functional mechanism of N, S co‐doped carbon coating and the origin of performance improvement of niobium oxides, which can be used for reference to design and develop relevant materials.