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Investigation of the Na Storage Property of One-Dimensional Cu2–xSe Nanorods

Li, He, Jiang, Jiali, Huang, Jianxing, Wang, Yunhui, Peng, Yueying, Zhang, Yiyong, Hwang, Bing-Joe, Zhao, Jinbao
ACS applied materials & interfaces 2018 v.10 no.16 pp. 13491-13498
anodes, copper, electrochemistry, nanorods, selenium, sodium
In this study, one-dimensional Cu₂–ₓSe 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. Cu₂–ₓSe 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 Cu₂–ₓSe 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 Cu₂–ₓSe, the Cu₂–ₓSe electrodes manifest fast Na⁺ ion diffusion rate. Moreover, detailed Na⁺ insertion/extraction mechanism is further investigated by ex situ measurements and theoretical calculations.