LAUSR

Lithium-ion batteries (LIBs) have become the research focus of energy storage products. Due to the combination of Li+ and the Lewis basic sites of polymer chains, anions move more than five times faster, which don't participate in the electrode reaction during the discharge cycles, leading to concentration polarisation, voltage losses, and high internal resistance. To solve this phenomenon, in our work, a polymer network structure of single-ion polymer electrolyte-based polyimide (DPI-SIGPE) with plasticiser (EC/DMC) was formed by in-situ crosslinking double bond polyimide, 4-styrene sulfonyl (benzenesulfonyl) imide and crosslinking agent pentaerythritol tetra(2-thiol acetate) under UV irradiation. By incorporating the anion as a part of the polymer chain, DPI-SIGPE exhibited high lithium-ion conductivity of 2.7×10-4 S cm-1 at 30°C and transference number of 0.87. Typical lithium stripping/plating cycling of 900 h demonstrated uniform lithium deposition impacted by DPI-SIGPE. Meanwhile, it had good dimensional thermal stability with no obvious shrinkage at 200°C for 0.5 h and wide electrochemical window of 4.6 V. Thus, the polyimide-based crosslinked single-ion gel polymer electrolyte has the promising potential for application in LIBs. This article is protected by copyright. All rights reserved.