Lithium Salt Catalyzed Ring-Opening Polymerized Solid-State Electrolyte with Comparable Ionic Conductivity and Better Interface Compatibility for Li-Ion Batteries

Abstract

Rechargeable lithium-ion batteries have drawn extensive attention owing to increasing demands in applications from portable electronic devices to energy storage systems. In situ polymerization is considered one of the most promising approaches for enabling interfacial issues and improving compatibility between electrolytes and electrodes in batteries. Herein, we observed in situ thermally induced electrolytes based on an oxetane group with LiFSI as an initiator, and investigated structural characteristics, physicochemical properties, contacting interface, and electrochemical performances of as-prepared SPEs with a variety of technologies, such as FTIR, 1H-NMR, FE-SEM, EIS, LSV, and chronoamperometry. The as-prepared SPEs exhibited good thermal stability (stable up to 210 °C), lower activation energy, and high ionic conductivity (>0.1 mS/cm) at 30 °C. Specifically, SPE-2.5 displayed a comparable ionic conductivity (1.3 mS/cm at 80 °C), better interfacial compatibility, and a high Li-ion transference number. The SPE-2.5 electrolyte had comparable coulombic efficiency with a half-cell configuration at 0.1 C for 50 cycles. Obtained results could provide the possibility of high ionic conductivity and good compatibility through in situ polymerization for the development of Li-ion batteries.

A Complex Investigation of LATP Ceramic Stability and LATP+PVDF Composite Membrane Performance: The Effect of Solvent in Tape-Casting Fabrication

“…One of the key components of RFBs is an ion-conductive solid membrane (sometimes referred to as a separator) [ 9 , 10 , 11 , 12 ] that maintains the charge balance in the cell [ 13 , 14 , 15 ]. Impacting RFB’s cycling stability and total cell resistance, the membrane strongly contributes to battery’s power density, durability, and efficiency.…”

Cross-Linked Gel Polymer Electrolyte Based on Multiple Epoxy Groups Enabling Conductivity and High Performance of Li-Ion Batteries

“…The detailed composition of the as-prepared CPEs can be seen in Table S2 in the SM. The asymmetric dummy cell was fabricated following our previous work [17] and was employed to evaluate the ionic conductivity of the as-prepared C-GPEs.…”

“…For example, Gels 2023, 9, 384 2 of 12 Xie et al [16] present a dual-salt PEO-based cross-linked network electrolyte with a σ value of 0.57 × 10 −3 S/cm at 30 • C, while Teng et al [9] present a poly(ethylene oxide)-copoly(propylene oxide)-based GPE that delivers a σ value of 2.8 × 10 −3 S/cm at 30 • C, but polarization occurs due to anion accumulation. Our group's recent work employed LiFSI as an initiator and successfully polymerized a dual-epoxy group precursor through thermal cationic ring-opening technology [6,17,18]. The results showed tight interface compatibility between the electrolyte and electrode, which enables the σ and cycling performance of the battery.…”

“…Epoxidized soybean oil (ESO), as a renewable raw material with multiple epoxy groups, has attracted great attention in recent years in both scientific and industrial areas, such as in fabricating lubricants, coatings, and bioplastics [29][30][31]. Research has explored the ring-opening polymerization of ESOs through boron trifluoride diethyl etherate (BF 3 .OEt 2 ), and the epoxy group-based precursor can successfully achieve cationic ring-opening polymerization using Li salts, including LiFSI, LiPF 6 , and lithium difluoro (oxalate) borate (LiDFOB) [4,17,22].…”