In situ induced crosslinking highly conductive solid polymer electrolyte with intimated electrodes interfacial compatibility for safe Li-ion batteries

Nowadays, lower ionic conductivity and interfacial issue are hindering industrial development of solid-state lithium batteries. Herein, we prepare cross-linking solid polymer electrolytes (CSPEs) with a certain amount of additive fluorosulfonamide (FSA) by employing lithium bis(fluorosulfonyl)imide (LiFSI) as an initiator for catalyzing cationic ring-opening polymerization (CROP) via an in-situ thermal strategy. a series of technologies have used to investigate the physiochemical properties and electrochemical performances of as-prepared CSPEs. The ionic conductivity of as-prepared CSPE-2 is 1.46 mS/cm at 25 °C. Its electrochemical anodic oxidation potential is stable up to 5.2 V. Its lithium transference number (tLi+) reaches to 0.61 at room temperature (RT). Furthermore, the assembled half-cell of LiFePO4/CSPE-2/Li delivers an excellent initial discharge capacity of 165 mAh/g at 0.1C and shows Coulombic efficiency (CE) of 96.7%. It retains its capacity at 136 mAh/g after 200 cycles. Full cell configuration of LiFePO4/CSPE-2/graphite shows an initial discharge capacity of 142 mAh/g at 0.1C, retains its capacity at 122 mAh/g, and achieves a CE of 90.2% after 200 cycles. Field emission scanning electron microscope (FE-SEM) reveals an intimate interface compatibility with additive FSA. This study may provide a strategy to design and fabricate solid-state electrolytes for lithium-ion batteries. [Display omitted] •A novel fluorosulfonamide as an additive is synthesized successfully.•As prepared CSPEs show excellent physicochemical and electrochemical properties.•FESEM revealed that CSPEs have intimate interfacial compatibility with electrodes.•The cell performances delivered better initial discharge capacity and cyclability.