Fig. 2: The MOF Glass coating positively stabilizes the NCM cathode and enhances Li-ion desolvation and transport.
From: Metal-organic framework glass stabilizes high-voltage cathodes for efficient lithium-metal batteries
a XRD patterns of bare NCM-811 and Glass@NCM-811 cathodes. b Rate performances of batteries based on bare NCM-811 and Glass@NCM-811 cathodes (defined 1 C = 220 mA/g). c The state of charge (SoC) vs. time curves of Li||NCM-811 and Li||Glass@NCM-811 cells. This indicated the much faster Li-ion desolvation and transport of Li||Glass@NCM-811 cell due to the much lower interfacial resistance. d Discharge curves of the GITT measurements conducted after the 100th cycle (same cells used in Fig. 2b). Inset: average voltage loss and its standard deviation over different GITT steps. e FTIR spectra of typical electrolyte (LiPF6-EC/DMC, the bottom panel) and electrolyte formed inside the Glass layer (the top panel). The aggregative electrolyte inside the Glass layer suggested the successfully pre-desolvation enabled by the sub-nanochannels of the Glass layer. f Comparison of activation energies during Li-ion desolvation and its migration across the cathode electrolyte interphase (CEI) for Li||NCM-811 and Li||Glass@NCM-811 cells. g Comparison of the kinetics of desolvation/pre-desolvation and Li-ion transport through the cathode electrolyte interphase (CEI) in Li||NCM-811 cell (the top panel) and Li||Glass@NCM-811 cell (the bottom panel). h Schematic illustration of solvated Li-ions penetrating through the typical CEI formed on cycled bare NCM-811 cathode (top panel) and Glass layer on cycled Glass@NCM-811 cathode (bottom panel).
