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Construction of Nitrogen‐Doped Carbon‐Coated MoSe 2 Microspheres with Enhanced Performance for Lithium Storage
Author(s) -
Tang Wangjia,
Xie Dong,
Shen Tong,
Wang Xiuli,
Wang Donghuang,
Zhang Xuqing,
Xia Xinhui,
Wu Jianbo,
Tu Jiangping
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201702840
Subject(s) - anode , materials science , lithium (medication) , electrochemistry , chemical engineering , current density , hydrothermal circulation , composite number , carbon fibers , coating , nitrogen , polarization (electrochemistry) , polymerization , electrode , nanotechnology , composite material , organic chemistry , polymer , chemistry , medicine , physics , quantum mechanics , engineering , endocrinology
Exploring advanced anode materials with highly reversible capacity have gained great interests for large‐scale lithium storage. A facile two‐step method is developed to synthesize nitrogen‐doped carbon coated MoSe 2 microspheres via hydrothermal plus thermal polymerization. The MoSe 2 microspheres composed of interconnected nanoflakes are homogeneously coated by a thin nitrogen‐doped carbon (N‐C) layer. As an anode for lithium ion batteries, the MoSe 2 /N‐C composite shows better reversibility, smaller polarization, and higher electrochemical reactivity as compared to the unmodified MoSe 2 microspheres. The MoSe 2 /N‐C electrode delivers a high specific capacity of 698 mAh g −1 after 100 cycles at a current density of 100 mA g −1 and good high rate performance (471 mAh g −1 at a high current density of 2000 mA g −1 ). The improved electrochemical performance is attributed to the conductive N‐C coating and hierarchical microsphere structure with fast ion/electron transfer characteristics.