Fig. 4: Key steps in the development of coupled solid polymer electrolytes (SPEs).
From: A reflection on polymer electrolytes for solid-state lithium metal batteries

a Chemical formula of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium trifluoromethanesulfonate (LiTf) and their ionic conductive properties in poly(ethylene oxide) (PEO)-based solid electrolytes at various temperatures. The values are taken from ref. 38. b Graphical representation of the inclusion of inorganic fillers in polymer electrolytes. c Schematic representation of amorphous Jeffamine-based polymer electrolytes. d Graphical summary of the in situ ultraviolet photo-irradiated cross-linking strategy for the PEO-based electrolytes.