Synthesis and Electronic/ionic Transport Properties of MoO2/rGO Anode for Lithium Ion Batteries |
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Authors: | Yongli Cui Yaming Pu Yuwan Hao Wenjing BAO Quanchao Zhuang |
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Institution: | School of Materials Science and Engineering, China University of Mining & technology, Xuzhou 221116, China |
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Abstract: | MoO2/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 MoO2/rGO during lithiation/delithiation. The obtained MoO2‐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 MoO2/rGO anode at the potential ranging from 1.0 to 3.5 V, locating at ELi/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 RSEI and RCT for the MoO2/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 cm2 s?1. |
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Keywords: | Lithium ion battery MoO2/rGO anode Electronic/ionic transport properties Lithium diffusion coefficient |
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