Fig. 4. Electrochemical performance of the bipyramid prism S@BPCS electrode.

a Charge–discharge profiles at different cycle numbers. b Rate capabilities at different current densities. c Rate performance and the corresponding Coulombic efficiency at 0.5 C. d Rate performance and the corresponding Coulombic efficiency with mass loading 7.3 mg cm⁻². e Rate performance with mass loading 9.1 mg cm⁻². f Coulombic efficiency of different metal chalcogenides. g Areal capacities of all electrodes with different mass loadings at different cycle numbers and h comparison of the rate performance and capacity of previously reported Na–S batteries with this work.