Fig. 5From: Copper Nanoparticle-Incorporated Carbon Fibers as Free-Standing Anodes for Lithium-Ion BatteriesThe first, second, and 10th charge/discharge curves of a Cu/CF-600, b Cu/CF-700, and c Cu/CF-800 electrodes vs. Li/Li+ at a current density of 100 mA g−1 in the voltage range of 0.005–3 VBack to article page