Fig. 1: Synthesis and schematic diagram of the Li+ ion transport channels in Li-CuMH.

a Schematic of the self-assembly synthesis route of CuMH powders. NO3−, MA, AN, CuMH are represented as nitrate ion, maleic acid, acetonitrile, and copper maleate hydrate, respectively. b Top view and c side view SEM images of 2D CuMH nanoflakes. d Digital photograph of a typical 6 cm × 6 cm-sized Li-CuMH SSE film. e Schematic diagram of 1D Li+ ion transport pathways in Li-CuMH.