Figure 1

Energy density of a LIB cell versus capacity of a negative-electrode material.
Three lines are calculated with assuming different positive-electrode materials considering their different operating potentials; LiCoO2 (ca. 140 mAh g−1, 3.7 V), S (1672 mAh g−1, 1.8 V) and S (2.1 V). Details about the calculation are given in the Supporting Information.