All-solid-state flexible nanocomposite polymer electrolytes based on poly(ethylene oxide): Lithium perchlorate using functionalized graphene

Abstract

Solid polymer electrolytes (SPEs) rapidly attracted a great attention as a potential material to be used in flexible rechargeable lithium ion batteries, if an optimal match between their ionic conductivity and mechanical stability was achieved. In this work, two types of nanocomposite SPE based on poly(ethylene) oxide (PEO) and lithium perchlorate salt (LiClO 4) containing pristine graphene (GnP) or polyethylene glycol-grafted graphene (FGnP) were prepared. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) results revealed a reduced degree of crystallinity for nanocomposite electrolytes. The increment in amorphous phase domains was also confirmed by polarized optical microscope (POM), particularly for SPE/FGnP nanocomposites. Ionic conductivity showed one order of magnitude enhancement for SPE/FGnP(0.5%) at room temperature, while mechanical stability was also improved reasonably. Polyethylene glycol grafted onto FGnP appears to play two roles: plasticizing effect to promote the segmental motion of PEO chains, and contributing in dissociation of lithium salt.

Polymer Nanocomposites: Synthesis and Characterization

“…It was concluded here that the natural HNT clay mineral provides the desirable energy density at low cost with improved safety. Gomari et al, [70] reported the preparation of nanocomposite solid polymer electrolyte based on poly(ethylene) oxide (PEO) and lithium perchlorate salt (LiClO4) with pristine graphene (GnP) or polyethylene glycol-grafted graphene (FGnP). From FESEM analysis of the nanocomposite, it was concluded that the rough surface of the pristine PEO changes to smooth on the addition of GnP/FGnP and suggests the better dispersion of both.…”

Flexible, high-voltage, ion-conducting composite membranes with 3D aramid nanofiber frameworks for stable all-solid-state lithium metal batteries

“…Nevertheless, it is difficult to greatly increase the mechanical strength by using the nanofillers for commercial applications due to the failure of forming interconnected reinforcements [3,26]. Moreover, the room-temperature ion conductivity cannot be greatly improved, because of the low dispersity of the high-surface-area nanofillers, poor interactions between the nanofiller and the electrolyte matrices, and short ion transport pathways between the nanofiller/polymer-Li salt interfaces [13,25,[27][28][29]. To address these issues, constructing special CPEs by filling the SPEs in porous inorganic films as three-dimensional (3D) scaffolds has been reported to significantly enhance the thermal stability, electrochemical window and ionic conductivity [30][31][32][33][34][35][36]; however, there are few reports on the mechanical properties of these CPEs and the cycling performance of the CPE-based all-solid-state batteries, possibly due to the high stiffness/brittleness of the ceramic scaffolds.…”

Microstructural Development and Rheological Study of a Nanocomposite Gel Polymer Electrolyte Based on Functionalized Graphene for Dye-Sensitized Solar Cells

“…They suggested that NPs acted as a multifunctional component in the GPE. In a very recent study, Gomari et al [ 29 ] pioneeringly grafted poly ethylene glycol (PEG) onto graphene and employed it in a PEO electrolyte to enhance ionic conductivity through lowering the nanocomposite crystallinity. According to their results, PEG-grafted graphene was achieved through hydrogen bonding with oxygen atoms of PEO chains, possibly deteriorating the crystallinity of the PEO-based electrolyte.…”