Figure 5From: Copper nanofiber-networked cobalt oxide composites for high performance Li-ion batteries AC impedance spectra for both samples. The experimental results are presented as Nyquist plots by applying a sine wave with amplitude of 5 mV over the frequency range 100 kHz to 10 mHz, which were measured at E = 1.6 V (vs. Li+/Li) after the cycles.Back to article page