fig11

Figure 11. (A) Rate performance of pure SnSe₂ and five groups of Cu-doped SnSe₂ electrodes at various current densities (0.1, 0.2, 0.3, 0.4, 0.5 C). (B) Cycle performance at 0.1 C for 100 cycles, (C₁) SEM images of pure SnSe₂, (C₂) SnSe₂/0.1Cu, (C₃) SnSe₂/0.2Cu, (C₄) SnSe₂/0.3Cu, (C₅) SnSe₂/0.4Cu, (C₆) SnSe₂/0.5Cu^[57], Copyright 2019, Elsevier. (D) Rate performance of 2D/2D SnSe₂/graphene heterostructure, (E) The synthesis and assembly process of 2D/2D SnSe₂/graphene heterostructure, (G) Long-term cycling performance at 0.5 C for 2D/2D SnSe₂/graphene heterostructure^[59], Copyright 2020, Elsevier. (F) Illustration of the discharge process in Se-based cathodes, (H) Rate performance of the Se@CoSe₂-PC at increasing current density from 0.1 C to 10 C, (I) Cycling performance and coulombic efficiency comparisons between the Se@CoSe₂-PC and the Se@PC composite electrodes at 1 C^[63]. Copyright 2018, Elsevier.