New aromatic polymer electrolytes for application in lithium metal batteries

We report a new synthetic strategy for single Li-ion conducting solid polymer electrolytes based on the fully aromatic polymer poly(ether ether ketone) (PEEK) grafted with differently substituted bis(sulfonyl)imide groups for use in lithium metal and lithium-ion batteries. The preferred polymer contains no fluorine and is particularly advisable from an environmental point of view. Its ionic conductivity reaches 0.03 mS cm−1 at 65 °C.