Fig. 5

High-loading Li–S cells with CNF current collector. a SEM image of the top surface of CNF current collector (scale bar = 10 µm). b SEM image of the cross-section of the sulfur cathode with CNF current collector (scale bar = 20 µm). c The 1st cycle discharge voltage profiles of the cells with one-layer or two-layer highly loaded sulfur cathodes deposited onto CNF current collectors. d Cycling performance of the cells with one-layer or two-layer CNF current collector sulfur cathodes