Twist-Shaped CuO Nanowires as Anode Materials for Lithium Ion Batteries
(a) Cyclic voltammetry curves of CuO-500°C nanowires in the 1st, 2nd, and 3rd cycles. (b) Galvanostatic discharge-charge profiles in the 1st, 2nd, and 3rd cycles of CuO-500°C nanowires at the current density of 100 mA g−1. (c) Cycling performances of CuO-300°C, CuO-400°C, and CuO-500°C at the current density of 100 mA g−1. (d) Electrochemical impedance spectra plots of CuO nanowires electrodes over the frequency range of 100 kHz and 0.01 Hz.