fig4

Figure 4. (A) C-rate plot at 70 °C consisting in 5 cycles of two hours at 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 mA cm^-2; (B) Voltage profile as a function of time, with a current density of 50 µA cm^-2 with a record time of 10 s at 40 °C; (C) Polarization concentration plot of symmetric cells Li|SPE|Li, EO:Li 20:1 of LiTFSI/PEO, LiC_2,2TFSI/PEO, and LiC_6,6TFSI/PEO of 0.05 mA cm^-2 for 4 h at 70 °C. PEO: Poly(ethylene oxide); LiC_2,2TFSI: Lithium(trifluoromethanesulfonyl)(N,N-diethylsulfamoyl)imide; LiC_6,6TFSI: lithium(trifluoromethanesulfonyl)(N,N-dihexylsulfamoyl)-imide; EO:Li: ethylene oxide:lithium cation; SPE: solid polymer electrolyte.