A new Na+ ion conducting polymer electrolyte based on (PEO+NaYF4) and its use as an electrochemical cell

Rao, S. Sreepathi; Reddy, M. Jaipal; Reddy, K. Narasimha; Rao, Uma

doi:10.1016/0167-2738(94)90214-3

Cited by 29 publications

(5 citation statements)

References 10 publications

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“…We will investigate additives in follow-up work. Second, it is known that the segmental mobility of the polymer chains in the amorphous phase is slowed down by the presence of the crystalline phase due to their connected nature. − In Figure g, it is observed that the glass transition temperature of PEO decreased with increasing hot stretching strain. We think two underlying causes may lead to this change: first, due to the connected nature between the crystalline phase and the amorphous phase, a change in the crystalline morphology (lamellar thickness, lateral dimension, and orientation) may affect the segmental dynamics of the amorphous phase.…”

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confidence: 98%

Ionic Conductivity Enhancement of Polymer Electrolytes by Directed Crystallization

et al. 2022

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We report that hot stretching of poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) can lead to a preferred orientation of PEO crystalline lamellae, thereby reducing the tortuosity of the ion-conduction pathway along the thickness direction of the SPE film, causing improved ionic conductivity. The hot stretching method is implemented by stretching SPE films above the melting point of PEO in an inert environment followed by crystallization at room temperature while maintaining the applied strain. The effect of hot stretching on the crystalline orientation, crystallinity, morphology, and ion transport in PEO with two types of salts, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium triflate (LiCF3SO3), is investigated in detail. Wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) show that the orientation of PEO crystalline lamellae induces the formation of a short ion-conduction pathway along the through-plane direction of the SPE films, leading to 1.4- to 3.5-fold enhancement in the through-plane ionic conductivity.

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confidence: 98%

Ionic Conductivity Enhancement of Polymer Electrolytes by Directed Crystallization

et al. 2022

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“…Polymer electrolytes have applications in solid-state Li-ion [1][2][3][4][5] and Na-ion [6][7][8] secondary batteries, as well as medium to large scale energy storage such as flow batteries. Poly(ethylene oxide) (PEO) is one of the most widely studied polymers for use as a polymer electrolyte, [9][10][11][12] but generally exhibits low room temperature ionic conductivities of 10 −7 -10 −6 S cm −1 8,12-14 due to the formation of a crystalline phase at ∼60 °C.…”

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confidence: 99%

Well-designed Crosslinked Polymer Electrolyte Enables High Ionic Conductivity and Enhanced Salt Solvation

Lehmann

Yang

Nanda

et al. 2020

J. Electrochem. Soc.

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A new facile single-step method to fabricate crosslinked polymer electrolyte membranes consisting of branched poly(ethyleneimine), (PEI) and poly(ethylene oxide), (PEO) is demonstrated. The membranes exhibit excellent ionic conductivity (1.2 × 10−3 S cm−1 at 80 °C) with minimal addition of plasticizer (20 wt%). The amine functional group in the PEI-PEO crosslinked matrix provides Lewis basic and hydrogen bonding characteristics that facilitate the dissolution of lithium salt and enables a higher cation transport number than a PEO crosslinked matrix. The glass transition temperature, degree of crystallinity, and room temperature storage modulus increases with decreasing crosslink density and increasing ratio of free amines. The resultant ionic conductivity and mechanical strength can be flexibly tailored by varying the molar ratio of free amine moieties in the crosslinked PEI-PEO matrix. This study provides an improved synthesis method, in-depth characterization, and fundamental insights on the effect of free amine moieties on the transport properties of a highly conductive gel polymer electrolyte.

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“…In the past, solid polymer electrolytes based on polymers containing EO groups have been widely studied due to their ability to solvate cations. − …”

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confidence: 99%

Lithium Coordination in Cyclic-Carbonate-Based Gel Polymer Electrolyte

Tillmann¹,

Isken²,

Lex‐Balducci³

2015

J. Phys. Chem. C

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A gel polymer electrolyte based on a polymer host comprising cyclic carbonate and ethylene oxide (EO) moieties in the side chains and the liquid electrolyte 1 M LiPF 6 in ethylene carbonate (EC):dimethyl carbonate (DMC) 1:1 is studied regarding ionic and intermolecular interactions. Raman and NMR spectroscopic studies reveal that apart from the solvents of the liquid electrolyte also the polymer host is interacting with lithium ions. However, these interactions seem to be limited to the EO side chains. No evidence was found for an involvement of the cyclic carbonate moieties in the coordination of lithium ions. To evaluate the effect of the interactions between the lithium ions and the polymer network on the lithium-ion transport properties in the gel polymer electrolyte self-diffusion coefficients of the solvents, cation and anion were determined by pulsed field gradient (PFG)-NMR spectroscopy.

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A new Na+ ion conducting polymer electrolyte based on (PEO+NaYF4) and its use as an electrochemical cell

Cited by 29 publications

References 10 publications

Ionic Conductivity Enhancement of Polymer Electrolytes by Directed Crystallization

Ionic Conductivity Enhancement of Polymer Electrolytes by Directed Crystallization

Well-designed Crosslinked Polymer Electrolyte Enables High Ionic Conductivity and Enhanced Salt Solvation

Lithium Coordination in Cyclic-Carbonate-Based Gel Polymer Electrolyte

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