A class of imprintable, bendable, and shape-conformable polymer electrolyte with excellent electrochemical performance in lithium battery system is reported. The material consists of a UV-cured polymer matrix, high-boiling point liquid electrolyte, and Al(2) O(3) nanoparticles, formulated for use in lithium-ion batteries with 3D-structured electrodes or flexible characteristics. The unique structural design and well-tuned rheological characteristics of the UV-curable electrolyte mixture, in combination with direct UV-assisted nanoimprint lithography, allow the successful fabrication of polymer electrolyte in geometries not accessible with conventional materials.
"The enhanced ionic conductivities are associated with the electrolyte uptake due to the enhanced specific surface area from Al 2 O 3 nanoparticles, which increases the motivation of lithium ions. The generation of free volume at the surface of the dispersed Al 2 O 3 may also contribute to the improved ionic conductivity . Fig. 5a exhibits the AC impedance spectra of GPE and CPE. "
[Show abstract][Hide abstract] ABSTRACT: Composite polymer electrolytes (CPE) based on triethylene glycol diacetate-2-propenoic acid butyl ester (TEGDA-BA) incorporating Al2O3 nanoparticles have been fabricated via in situ polymerization. The CPE have exhibited highly uniform morphology, excellent mechanical property (maximum stress up to ~1.3MPa), high ionic conductivity up to 3.92×10-3Scm-1 at 25°C, coupled with very high electrochemical stability (>5.0V vs. Li/Li+). The Li|CPE|Li[Li1/6Ni1/4Mn7/12]O7/4F1/4 cells have demonstrated remarkably stable charge/discharge performance and great capacity retention in the potential range of 2.0-4.8V. The unexpected growth of interface resistance has been retarded with the presence of Al2O3, indicating the enhancement of the interface stability. The results suggest that the CPE have demonstrated tremendous application potential in high-voltage lithium ion batteries.
[Show abstract][Hide abstract] ABSTRACT: We demonstrate mechanically compliant and lithium dendrite growth-suppressing composite polymer electrolytes for use in flexible lithium-ion batteries. This new composite polymer electrolyte (referred to as “CPE”) is fabricated via an exquisite combination of UV (ultraviolet)-cured ethoxylated trimethylolpropane triacrylate macromer (serving as a mechanical framework) and Al2O3 nanoparticles (as a functional filler) in the presence of a high boiling point liquid electrolyte. A distinctive structural feature of the CPE is the close-packed Al2O3 nanoparticles in the liquid electrolyte-swollen ETPTA macromer matrix. Owing to this unique morphology, the CPE provides significant improvements in the mechanical bendability and suppression of lithium dendrite growth during charge–discharge cycling.
[Show abstract][Hide abstract] ABSTRACT: The unending demand for portable, flexible, and even wearable electronic devices that have an aesthetic appeal and unique functionality stimulates the development of advanced power sources that have excellent electrochemical performance and, more importantly, shape versatility. The challenges in the fabrication of next-generation flexible power sources mainly arise from their limited form factors, which prevent their facile integration into differently shaped electronic devices, and from the lack of reliable electrochemical materials that exhibit optimized attributes and suitable processability. This review describes the technological innovations and challenges associated with flexible energy storage and conversion systems such as lithium-ion batteries and supercapacitors, along with an overview of the progress in flexible proton exchange membrane fuel cells (PEMFCs) and solar cells. In particular, recently highlighted cable-type flexible batteries with extreme omni-directional flexibility are comprehensively discussed.
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