Figure 3. Inorganic materials for lithium-sulfur batteries: a) Schematic illustration of CNT@TiO 2-x regulation of LiPS redox. Reproduced with permission. [51] Copyright 2019, Wiley-VCH Verlag. b) Layered LiTiO 2 for the protection of Li 2 S cathodes against dissolution. Reproduced with permission. [58] Copyright 2018, Royal Society of Chemistry. c)The roles of the Chevrel-phase Mo 6 S 8 in the hybrid Mo 6 S 8 /S 8 cathode. Reproduced with permission. [61] Copyright 2019, Springer Nature. d) The MoN-C-MoN trilayer architecture enabled high-performance lithium-sulfur. Reproduced with permission. [68] Copyright 2020, John Wiley and Sons Ltd. e) Ti 3 C 2 T x entrapping the polysulfides by forming a sulfate complex protective barrier. Reproduced with permission. [75] Copyright 2018, Wiley-VCH Verlag. f) Cycle life of TiO 2 -Ni 3 S 2 /rGO electrode with 3.92 mg cm À2 sulfur loading. Reproduced with permission. [76] Copyright 2020, Wiley-Blackwell. g) cobalt in nitrogen-doped graphene (Co-N/G) as a single-atom catalyst toward high-performance lithium-sulfur batteries. Reproduced with permission. [79] Copyright 2019, Wiley-Blackwell. h) The natural Vermiculite is used as a sulfur host in lithium-sulfur batteries. Reproduced with permission. [81]

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