Li‐Salt Doped Single‐Ion Conducting Polymer Electrolytes for Lithium Battery Application

Traditionally solid polymer electrolytes (SPEs) for lithium battery application are made by dissolving a Li-salt in matrix, which renders both the Li+ cations, charge carriers of interest, and anions, only by-standers, mobile. In contrast, single-ion conductors (SICs), with solely cation mobile, can be created grafting anions onto backbone. SICs provide safety, mechanical stability, flexibility SPEs, but often suffer ionic conductivity. Herein an intrinsically synergetic design is suggested explored; one dopes promising SIC, LiPSTFSI (poly[(4-styrenesulfonyl) (trifluoromethanesulfonyl)imide]), common Li-salt, LiTFSI. This way increases concentration transport. Indeed, systematically exploring doping, it found that 50–70 wt% LiTFSI materials considerable improvements (Li+) dynamics A deeper analysis allows to address connections between ion transport mechanism(s) (Arrhenius/VTF), carrier speciation concentration, free volume glass transition temperature. While no silver bullet even remotely found, general findings open paths further explored SPEs doped particular.