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Coated/Sandwiched rGO/CoS x Composites Derived from Metal–Organic Frameworks/GO as Advanced Anode Materials for Lithium‐Ion Batteries
Author(s) -
Yin Dongming,
Huang Gang,
Zhang Feifei,
Qin Yuling,
Na Zhaolin,
Wu Yaoming,
Wang Limin
Publication year - 2016
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.201504399
Subject(s) - materials science , graphene , anode , lithium (medication) , electrochemistry , oxide , metal organic framework , coating , composite material , composite number , electrode , transition metal , chemical engineering , nanotechnology , catalysis , metallurgy , adsorption , organic chemistry , chemistry , medicine , endocrinology , engineering
Rational composite materials made from transition metal sulfides and reduced graphene oxide (rGO) are highly desirable for designing high‐performance lithium‐ion batteries (LIBs). Here, rGO‐coated or sandwiched CoS x composites are fabricated through facile thermal sulfurization of metal–organic framework/GO precursors. By scrupulously changing the proportion of Co 2+ and organic ligands and the solvent of the reaction system, we can tune the forms of GO as either a coating or a supporting layer. Upon testing as anode materials for LIBs, the as‐prepared CoS x ‐rGO‐CoS x and rGO@CoS x composites demonstrate brilliant electrochemical performances such as high initial specific capacities of 1248 and 1320 mA h g −1 , respectively, at a current density of 100 mA g −1 , and stable cycling abilities of 670 and 613 mA h g −1 , respectively, after 100 charge/discharge cycles, as well as superior rate capabilities. The excellent electrical conductivity and porous structure of the CoS x /rGO composites can promote Li + transfer and mitigate internal stress during the charge/discharge process, thus significantly improving the electrochemical performance of electrode materials.