Abstract
A series of new self-standing gel polymer electrolytes (SGPEs) were fabricated by ultraviolet (UV) curing and investigated for application in flexible lithium-ion batteries. Compared with traditional gel polymer electrolytes (combine with solvents or plasticizers), these new SGPEs were prepared simply by curing different weight ratios of lithium bis(fluorosulfonyl)imide (LiFSI) with a methacrylic linear monomer, poly (ethylene glycol) dimethacrylate (PEGDMA). Noticeably, there were no solvents or plasticizers combined with the final SGPEs. Owing to this, the SGPEs showed high flexibility and strong mechanical stability. Some paramount physicochemical and electrochemical characters were observed. The SGPEs demonstrated good thermal stability below 150 °C and an extremely low glass transition temperature (Tg) (around −75 °C). Moreover, plastic crystal behaviors were also identified in this study. Ultimately, the SGPEs demonstrated excellent ionic conductivity at room temperature, which proves that these new SGPEs could be widely applied as a prospective electrolyte in flexible lithium-ion batteries.
Highlights
Lithium-ion batteries (LIBs) have been paid increasing attention in recent decadesdue to their high energy density, long cycle lives, and high efficiency
A series of standing gel polymer electrolytes (SGPEs) were fabricated with the precursor mixture solutions through UV-curing
The thickness of the SGPEs was controlled under 300 μm by adjusting the silicon mold size and plates
Summary
Lithium-ion batteries (LIBs) have been paid increasing attention in recent decades (since 1991). Poor ambient temperature ionic conductivity (10−5 S/cm) of SPEs, which is caused by a high Ohmic drop in the electrolyte, is the main barrier limiting their wide application in LIBs [18,19,20,21]. To cope with this barrier, high-performance gelled polymer electrolytes (GPEs) have received great interest and have been investigated by some groups. The ion transference number was measured to confirm the cations’ mobility in the investigated electrolytes
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