Schematic of the batteries with different cathodes and corresponding charge/discharge curves. (a) Sulfur cathodes. The main challenge derives from the formation of soluble LiPSs. The left figure is reproduced with permission [65
]. Copyright 2017, Wiley-VCH. The right figure is reproduced with permission [67
]. Copyright 2019, Wiley-VCH. (b) Oxygen cathodes. Reproduced with permission [85
]. Copyright 2019, Wiley-VCH.