Facile one-step synthesis of Cu2O@Cu sub-microspheres composites as anode materials for lithium ion batteries

doi:10.1016/j.jmst.2017.12.010

Abstract

Abstract:

Cu₂O@Cu sub-microspheres composites with a narrow particle size distribution from 300 to 500 nm was successfully fabricated by one-step synthesis through the direct thermal decomposition of copper nitrate (Cu(NO₃)₂) in octadecylamine (ODA) solvent. As anode materials for lithium ion batteries, the Cu₂O@Cu composites obviously possess high specific capacity, excellent cyclic stability and rate capability. The coulombic efficiency is about 84% in the 1 st cycle and increases significantly up to 97.8% during successive cycles at various current densities. Even under a high current density of 500 mA g^-1, the discharge capacity of Cu₂O@Cu composites remains up to 200 mAh g^-1. The excellent electrochemical properties are ascribed to the synergistic effect between high electronic conductivity and volume-buffering capacity of metallic copper composited with Cu₂O.

Key words: Cu₂O@Cu composites, Anode materials, Octadecylamine, One-step synthesis

Huijie Zhou, Hongbin Zhao, Xuan Zhang, Hongwei Cheng, Xionggang Lu, Qian Xu. Facile one-step synthesis of Cu₂O@Cu sub-microspheres composites as anode materials for lithium ion batteries[J]. J. Mater. Sci. Technol., 2018, 34(7): 1085-1090.

Figures/Tables 6

Fig 1. XRD patterns: (a) Cu2O@Cu and metallic Cu, (b) Rietveld refinement of XRD pattern of Cu2O@Cu.

Fig. 2. Structural analysis of Cu2O@Cu: (a,b) SEM micrographs, (c) corresponding EDS spectrum, (d) content of Cu and O elements.

Fig. 3. TEM and HRTEM images of as-prepared Cu2O@Cu composites: (a,b) low- magnification TEM images of Cu2O@Cu composites, (c) high-magnification image of Cu2O@Cu composites, (d) HRTEM image of a portions of the composites.

Fig. 4. (a) Cyclic voltammetry curves of Cu2O@Cu composites, (b) galvanostatic discharge-charge curves of Cu2O@Cu composites at 50 mA g-1.

Fig. 5. (a) Rate capability of Cu2O@Cu composites at various current densities, (b) cycling performance of Cu2O@Cu composites at 50 mA g-1.

Fig. 6. Nyquist plot of Cu2O@Cu electrode (inset is an equivalent circuit model).

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Facile one-step synthesis of Cu₂O@Cu sub-microspheres composites as anode materials for lithium ion batteries

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