Preparation of one-dimensional bamboo-like Cu2-xS@C nanorods with enhanced lithium storage properties

Wang, Yunhui, Zhang, Yiyong, Li, He, Peng, Yueying, Li, Jiyang, Wang, Jing, Hwang, Bing Joe and Zhao, Jinbao (2017) Preparation of one-dimensional bamboo-like Cu2-xS@C nanorods with enhanced lithium storage properties. Electrochimica Acta, 247, 271-280. (doi:10.1016/j.electacta.2017.07.022).

Abstract

Nanostructure construction and surface modification are effective ways to improve the electrochemical performances of electrode materials, especially for the conversion reaction-based materials. In this study, one-dimensional carbon coating bamboo-like Cu2-xS nanorods have been delicately designed in a template-free method. The structure and morphology are well characterized via different instruments such as X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Tested in lithium batteries as the anode, the Cu2-xS@C electrode shows superior electrochemical performances to pristine Cu2-xS. At 1 and 2 C, the Cu2-xS@C nanorod electrode releases 309 and 277 mAh g−1after 300 cycles. At high rates of 15 and 22 C, the electrode still exhibits 269 and 264 mAh g−1. The kinetics of electrodes are also investigated by means of cyclic voltammetry (CV) and galvanostatic intermittence titration (GITT) measurements, proving the enhanced electrochemical properties. Thus, the one-dimensional bamboo-like Cu2-xS voided nanorods can be a promising candidate for high-performance batteries.

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Contributors

Author: He Li

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