A novel PEO-based composite solid-state polymer electrolyte with methyl group-functionalized SBA-15 filler for rechargeable lithium batteries

Abstract

Functionalized molecular sieve SBA-15 with trimethylchlorosilane was used as an inorganic filler in a poly(ethyleneoxide) (PEO) polymer matrix to synthesize a composite solid-state polymer electrolyte (CSPE) using LiClO4 as the doping salts, which is designated to be used for rechargeable lithium batteries. The methyl group-functionalized SBA-15 ((f)SBA-15) powder possesses more hydrophobic characters than SBA-15, which improves the miscibility between the (f)SBA-15 filler and the PEO matrix. The interaction between the (f)SBA-15 and PEO polymer matrix was investigated by scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry. Linear sweep voltammetry and electrochemical impedance spectroscopy were employed to study the electrochemical stability windows, ionic conductivity, and interfacial stability of the CSPE. The temperature dependence of the change of the PEO polymer matrix in the CSPE from crystallization to amorphous phase was surveyed, for the first time, at different temperature by Fourier transform infrared emission spectroscopy. It has demonstrated that the addition of the (f)SBA-15 filler has improved significantly the electrochemical compatibility of the CSPE with a lithium metal electrode and enhanced effectively the ion conductivity of the CSPE

The effects of SiO 2 and TiO 2 nanofillers on structural and electrochemical properties of poly(ethylene oxide)–EMIHSO 4 electrolytes

“…A similar trendfor PEO-based electrolytes was reported in [18,35,37]. In amorphous state, the inert nanofillers may restrict the chain motion or block the ion transport [11,19,38], which explains the slightly higher activation energy of the ionic conduction for PEO-EMIHSO 4 -SiO 2 electrolytes. While a similar effect is expected for PEO-EMIHSO 4 -TiO 2 , the higher dielectric constant of TiO 2 may promote the ionic conduction, resulting in a slightly lower E a .The trends in Figure 2 imply that TiO 2 and SiO 2 fillers affect the ionic dissociation and the ion transport in PEO-EMIHSO 4 differently, especially in the amorphous phase.…”

“…Figure 3 shows the XRD patterns of these four samples. The two dominant peaks at 19° and 23° (2θ) represent the crystalline phase of PEO [11,39]. The intensity of these peaks decreased substantially in the PEO-EMIHSO 4 electrolyte, and further decreased with the addition of SiO 2 or TiO 2 .…”

“…One way to improve the performance of PEO-based electrolytes is to disperse inorganic fillers such as SiO 2 , TiO 2 , or Al 2 O 3 in the electrolyte [10][11][12]. Inorganic fillers have been reported to be able to (a) prevent the recrystallization of the polymer chains,and to (b) promote ionic mobility and ionic dissociation through Lewis acid-base interaction between filler and polymer or filler and ionic species [10,13,14].However, these effects may vary with the ionic conductor, the size and type of the filler, and the manufacturing conditions of the electrolyte.…”

Poly(ethylene oxide)-based electrolytes for lithium-ion batteries

“…Thus, these unique properties have prompted researchers' attention to employ MOFs as fillers for a solid polymer electrolyte, especially for the PEO-based electrolyte. [322][323][324][325][326][327] Recently, Liu et al 323 Adhesion property of PEO-based electrolyte is critical to maintain good contact between the electrolyte and electrodes. However, solid polymer electrolytes usually show poor adhesion properties.…”

Nonisothermal crystallization behaviors and conductive properties of PEO‐based solid polymer electrolytes containing yttrium oxide nanoparticles

“…However, the high crystallinity of PEO retards the transmission of the conductive ions in the SPE, which results in poor ionic conductivity at ambient temperature. To promote the ionic conductivity, many modifications have been carried out on the PEO‐based SPE, such as blending with different polymers or plasticizers [16–18], cross‐linking [19], and incorporation of inorganic oxides [2, 5, 18, 20–23]. Inorganic oxides, especially the nanoparticles with large specific surface like Al 2 O 3 [5, 24], CuO [25], and SiO 2 [22, 26–29] etc., revealed the favorable effects on the performance enhancement of the SPE, for they could not only modify the conductivity but also the mechanical strength and special chemical stability.…”