Fig. 2: The effect of different TFSI− concentrations on CGL.

a–d Interface potential distribution images of L-FL35PH and L@FL35PH electrolytes. e, f The schematic diagram of the effect of CGL thickness on lithium ion transport channels, where cLi+ is the Li+ concentration and λ is the CGL thickness, g Fe K-edge XANES (min–max normalized), inset: a enlarged view, h fourier transforms Fe K-edge EXAFS spectra of Fe foil, Fe2O3, FeF3 and FeF3-TFSI− and i wavelet transform of FeF3 and FeF3-TFSI−, respectively.