fig4

Figure 4. (A) Rate performance; (B) Initial charge-discharge curves of the three batteries at 0.2 C; (C) Plateau-voltage-derived overpotentials at 0.2 C; (D) Cycling performance at 2.0 C; (E) Cycling performance of Ni-CoTe and CoTe batteries with high sulfur loadings; (F) Charge-discharge profiles of the Ni-CoTe battery over 100 cycles at 0.05 C.