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Conducting Graphene Decorated Li 3 V 2 (PO 4 ) 3 /C for Lithium‐Ion Battery Cathode with Superior Rate Capability and Cycling Stability
Author(s) -
Zhou Pan,
He Dawei
Publication year - 2016
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201600187
Subject(s) - graphene , chemistry , electrochemistry , raman spectroscopy , lithium (medication) , cathode , scanning electron microscope , transmission electron microscopy , oxide , lithium ion battery , electrode , nanotechnology , battery (electricity) , analytical chemistry (journal) , chemical engineering , materials science , composite material , medicine , power (physics) , physics , organic chemistry , quantum mechanics , endocrinology , chromatography , engineering , optics
In this study, core‐shell structured Li 3 V 2 (PO 4 ) 3 /C wrapped in graphene nanosheets has been successfully prepared. The reduction of graphene oxide and the synthesis of Li 3 V 2 (PO 4 ) 3 /C are carried out simultaneously using a chemical route followed by a solid‐state reaction. The effects of conducting graphene are studied by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectra and electrochemical measurements. The results reveal that the graphene sheets not only form a compact and uniform coating layer throughout the Li 3 V 2 (PO 4 ) 3 /C, but also stretch out and cross‐link into a conducting network around the Li 3 V 2 (PO 4 ) 3 /C particles. Thus, the graphene decorated Li 3 V 2 (PO 4 ) 3 /C electrode exhibits superior high‐rate capability and long‐cycle stability. It delivers a reversible discharge capacity of 178.2 mAh·g −1 after 60 cycles at a current density of 0.1 C, and the rate performances of 176, 169.3, 156.1 and 135.7 mAh·g −1 at 1, 2, 5 and 10 C, respectively. The superior electrochemical properties make the graphene decorated Li 3 V 2 (PO 4 ) 3 /C composite a promising cathode material for high‐performance lithium‐ion battery.