Investigation of the Na storage property of one-dimensional Cu_{2- x}Se nanorods

Li, He, Jiang, Jiali, Huang, Jianxing, Wang, Yunhui, Peng, Yueying, Zhang, Yiyong, Hwang, Bing Joe and Zhao, Jinbao (2018) Investigation of the Na storage property of one-dimensional Cu_{2- x}Se nanorods. ACS Applied Materials and Interfaces, 10 (16), 13491-13498. (doi:10.1021/acsami.8b00783).

Abstract

In this study, one-dimensional Cu 2−x Se nanorods synthesized by a simple water evaporation-induced self-assembly approach are served as the anode material for Na-ion batteries for the first time. Cu 2−x Se electrodes express outstanding electrochemical properties. The initial discharge capacity is 149.3 mA h g −1 at a current density of 100 mA g −1 , and the discharge capacity can remain at 106.2 mA h g −1 after 400 cycles. Even at a high current density of 2000 mA g −1 , the discharge capacity of the Cu 2−x Se electrode still remains at 62.8 mA h g −1 , showing excellent rate performance. Owing to the excellent electronic conductivity and one-dimensional structure of Cu 2−x Se, the Cu 2−x Se electrodes manifest fast Na + ion diffusion rate. Moreover, detailed Na + insertion/extraction mechanism is further investigated by ex situ measurements and theoretical calculations.

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Contributors

Author: He Li

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