Facile synthesis of rod-like Cu2−xSe and insight into its improved lithium-storage property

Li, He, Jiang, Jiali, Wang, Feng, Huang, Jianxing, Wang, Yunhui, Zhang, Yiyong and Zhao, Jinbao (2017) Facile synthesis of rod-like Cu2−xSe and insight into its improved lithium-storage property. ChemSusChem, 10 (10), 2235-2241. (doi:10.1002/cssc.201700317).

Abstract

© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.A rod-like Cu2-xSe is synthesized by a facile water evaporation process. The electrochemical reaction mechanism is investigated by exsitu X-ray diffraction (XRD). By adopting an ether-based electrolyte instead of a carbonate-based electrolyte, the electrochemical performance of Cu2-xSe electrodes improved significantly. The Cu2-xSe electrodes exhibit outstanding cycle performance: after 1000cycles, 160mAhg-1 can be maintained with a retention of 80.3%. At current densities of 100, 200, 500, and 1000mAg-1, the capacity of a Cu2-xSe/Li battery was 208, 202, 200, and 198mAhg-1, respectively, showing excellent rate capability. The 4-probe conductivity measurements along with electrochemical impendence spectroscopy (EIS) and cyclic voltammetry (CV) tests illustrate that the Cu2-xSe electrodes display high specific conductivity and impressive lithium-ion diffusion rate, which makes the Cu2-xSe a promising anode material for lithium-ion batteries.

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Contributors

Author: He Li

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