Single‐ion conducting polymer as lithium salt additive in polymerized ionic liquid block copolymer electrolyte

Herein, we describe the use of single-ion conducting block copolymer (SIC) as an additional lithium salt additive to a ternary solid polymer electrolyte (SPE), consisting poly(styrene-b-1-((2-acryloyloxy)ethyl)-3-butylimidazolium bis(trifluoromethanesulfo-nyl)imide) (S-ImTFSI64-16) copolymer, N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (C3mpyrFSI) ionic liquid (IL) and bis(fluorosulfonyl) imide (LiFSI) salt. For this purpose, S-ImTFSI64-16 was substituted by SIC, based on poly(styrene-b-((4-styrenesulfonyl)(trifluoromethanesulfonyl)imide salt)) (S-STFSILi64-16), at various molar ratios. The impact SIC concentration phase behavior transport properties SPEs investigated means differential scanning calorimetry, electrochemical impedance spectroscopy, diffusion NMR. In addition, performance assessed in symmetrical cell 50 80°C. Finally, cycling selected SPE also 80°C Li│NMC111 with capacity loading 1.3 mAh.cm−2 C-rate 0.1 C. full able deliver stable 0.94 after 20 cycles, corresponding 117 mAh.g−1. These results demonstrates that PIL copolymer—IL—salt composites represent promising choice for next generation solid-state high energy density metal batteries.