An ambient‐temperature superionic conductive, electrochemically stable, plastic cross‐linked polymer electrolyte for lithium metal battery

Abstract

AbstractA plastic cross‐linked polymer is prepared using acrylonitrile as a monomer and poly(ethylene glycol diacrylate) as a linking agent. A phase diagram‐guide rational design is introduced to fabricate the polymer composite electrolyte in the case of succinonitrile complexed with lithium bis‐trifluoromethanesulfonimide. The plastic cross‐linked polymer‐based electrolyte films with ambient‐temperature superionic conductivity (2.33 mS cm−1) and a wide electrochemical window (0–5.6 V vs. Li/Li+) have been demonstrated. The charging and discharging experiments of the plastic polymer composite electrolyte‐based lithium batteries show that the plastic polymer electrolyte can cycle normally and safely at a current density of 0.5 mA cm−2. These batteries exhibit excellent average coulombic efficiency of 98.5% in the first 150 cycles. The initial capacity at 25°C is 127.5 mAh g−1 (0.2 C), which is close to the value achieved by liquid‐electrolyte‐based cells under similar conditions. The capacity retention is 91% after 150 cycles.