Fig. 5

a CVs of NiCo₂S₄/N-CNT at a scan rate of 0.1 mV s⁻¹ between 0.01 and 3.0 V versus Li⁺/Li; b charge/discharge curves of NiCo₂S₄/N-CNT at 0.1 A g⁻¹; c rate capability of NiCo₂S₄/N-CNT electrodes at various current rates; d cycling performance of NiCo₂S₄/N-CNT, NiCo₂S₄/CNT, and NiCo₂S₄ at 0.1 A g^–1; e EIS plots of NiCo₂S₄/N-CNT, NiCo₂S₄/CNT, and NiCo₂S₄; f cycling performance at a current density of 0.5 A g⁻¹