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Hierarchical MoS 2 @Carbon Microspheres as Advanced Anodes for Li‐Ion Batteries
Author(s) -
Bai Zhongchao,
Zhang Yaohui,
Zhang Yuwen,
Guo Chunli,
Tang Bin
Publication year - 2015
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.201503587
Subject(s) - materials science , electrolyte , anode , electrochemistry , nanocomposite , chemical engineering , carbon fibers , ion , diffusion , nanotechnology , hydrothermal circulation , lithium (medication) , specific surface area , battery (electricity) , electrode , composite material , chemistry , catalysis , composite number , biochemistry , medicine , physics , power (physics) , organic chemistry , quantum mechanics , endocrinology , engineering , thermodynamics
Hierarchical hybridized nanocomposites with rationally constructed compositions and structures have been considered key for achieving superior Li‐ion battery performance owing to their enhanced properties, such as fast lithium ion diffusion, good collection and transport of electrons, and a buffer zone for relieving the large volume variations during cycling processes. Hierarchical MoS 2 @carbon microspheres (HMCM) have been synthesized in a facile hydrothermal treatment. The structure analyses reveal that ultrathin MoS 2 nanoflakes (ca. 2–5 nm) are vertically supported on the surface of carbon nanospheres. The reversible capacity of the HMCM nanocomposite is maintained at 650 mA h g −1 after 300 cycles at 1 A g −1 . Furthermore, the capacity can reach 477 mA h g −1 even at a high current density of 4 A g −1 . The outstanding electrochemical performance of HMCM is attributed to the synergetic effect between the carbon spheres and the ultrathin MoS 2 nanoflakes. Additionally, the carbon matrix can supply conductive networks and prevent the aggregation of layered MoS 2 during the charge/discharge process; and ultrathin MoS 2 nanoflakes with enlarged surface areas, which can guarantee the flow of the electrolyte, provide more active sites and reduce the diffusion energy barrier of Li + ions.