UV-Cured Cross-Linked Astounding Conductive Polymer Electrolyte for Safe and High-Performance Li-Ion Batteries

Abstract

UV-cured cross-linked polymer electrolytes are promising electrolytes for safe Li-ion batteries (LIBs) application due to their excellent conduction ability, low glass-transition temperature (T g ), and high discharge capacity. Herein, we have prepared novel fluorosulfonylimide methacrylic-based cross-linked polymer electrolyte membranes for LIBs via UV-curing process, which is a well-known, easy, low-cost, fast, and reliable technique. The synthesized UV-reactive novel methacrylate monomer with directly attached fluorosulfonylimide functional group methacryloylcarbamoyl sulfamoyl fluoride (MACSF) was used as a precursor for UV curing along with poly(ethylene glycol) dimethacrylate (PEGDMA) and lithium bis(fluorosulfonyl)imide (LiFSI). The results demonstrated that the cross-linked membrane with an optimized amount (30 wt %) of MACSF monomer (noted as CPE-3) showed the best performance. The nonflammable fluorosulfonyl group (a hydrophilic group of MACSF monomer) in the polymer matrix formed a wide channel, as a result of which Li ion can migrate easily via forming an ionic linkage. The CPE-3 electrolyte exhibited a low T g (−79 °C), excellent phase separation, high conductivity (σ) (ca. 3.5 × 10 −4 and 8.50 × 10 −3 S•cm −1 at 30 and 80 °C, respectively), and high flame retardancy. The battery performance of half-cell (LiFePO 4 /CPE-3/Li) and full cell (LiFePO 4 /CPE-3/graphite) with CPE-3 electrolyte were attractive: discharge capacities (155 and 152 mAh/g) with the capacity retentions of 96.17 and 95.17% after 500 cycles at 0.1 C rate for half-cell and full-cell LIBs, respectively.

Novel poly(epichlorohydrin)-based matrix for monolithic ionogel electrolyte membrane with high lithium storage performances

“…1D , the resulted MIEM exhibits stability up to 250 °C, much higher than that reported in the most recent literature. 42 It reveals that no phase transition peaks exist until decomposition temperature, further implying the presence of an amorphous phase in the structure of MIEM. This could be attributed to the interactions between the polymer chains and ions, which inhibit possible crystallization processes.…”

“…The MIEMs exhibit high ionic conductivities of 1.21 and 4.49 mS cm −1 at 20 and 70 °C, respectively, higher than those of the counterparts as reported in literatures. 5,42–47 This trend could be ascribed to the increase in the flexibility of the MIEM and faster diffusion of the ions with increasing temperatures. The ionic conductivity of LIBs should exceed 0.1 mS cm −1 in the working temperature ranges of 20–70 °C, and the MIEM prepared herein fulfilled this requirement.…”

Crosslinked xylose-based polyester as a bio-derived and degradable solid polymer electrolyte for Li+-ion conduction

“…, Tominaga, 16 Brandell, 17 and Mecerreyes 18,19 ) have also been studied for SPE applications, as well as more sophisticated materials such inorganic/polymer composites, 20–22 block co-polymers, 23–30 single-ion conducting polymers 24,31,32 and crosslinked polymers. 33–36 Among the latter category, Jang, Kim and co-workers recently reported impressive ionic conductivity close to the practical requirement ( ca. 10 −3 S cm −1 at room temperature) from a fluorosulfonylimide methacrylic-based crosslinked SPE.…”

High-Ionic-Conductivity Sodium-Based Ionic Gel Polymer Electrolyte for High-Performance and Ultrastable Microsupercapacitors

“…According to this, the UV solution is exposed to intense illumination for 10 s in this study to ensure the cross-linking reactions occur almost entirely. With respect to the list of literature studies, the ionic gel polymer electrolyte in this paper provides a significant outstanding fabrication time, not only for the UV light method but also for the thermal set method. − …”