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Synthesis and Electronic/ionic Transport Properties of MoO 2 /rGO Anode for Lithium Ion Batteries
Author(s) -
Cui Yongli,
Pu Yaming,
Hao Yuwan,
BAO Wenjing,
Zhuang Quanchao
Publication year - 2014
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201300628
Subject(s) - anode , scanning electron microscope , chemistry , monoclinic crystal system , lithium (medication) , intercalation (chemistry) , dielectric spectroscopy , electrochemistry , graphite , analytical chemistry (journal) , inorganic chemistry , crystal structure , crystallography , materials science , electrode , composite material , medicine , organic chemistry , endocrinology , chromatography
MoO 2 /rGO (reduced graphite oxide) composites have been synthesized by hydrothermal method followed by anneal and characterized by X‐ray diffraction (XRD) and scanning electron microscope (SEM). Galvanostatic charge/discharge testing and electrochemical impedance spectroscopy (EIS) techniques are employed to evaluate the kinetic behaviors of the MoO 2 /rGO during lithiation/delithiation. The obtained MoO 2 ‐based materials have monoclinic crystal structure, and worm like shape with average dimensions of 100‐200 nm width and 500 nm‐1 μm length. There are two steps of lithium ion intercalation/de‐intercalation for the MoO 2 /rGO anode at the potential ranging from 1.0 to 3.5 V, locating at E Li/Li + = 1.60/1.75 V, 1.25/1.40 V, and the first discharge and charge capacities are, respectively, 221.0 and 185.4 mAh g −1 . The resistances of R SEI and R CT for the MoO 2 /rGO anode are 2‐4 Ω and below 5 Ω. Moreover, the lithium diffusion coefficient calculated from the EIS measurement is about 3.6×10 −9 cm 2 s −1 .