Highly conductive solvent-free polymer electrolyte membrane for lithium-ion batteries: Effect of prepolymer molecular weight

He, Ruixuan; Echeverri, Mauricio; Ward, Daniel; Zhu, Yu; Kyu, Thein

doi:10.1016/j.memsci.2015.10.008

Cited by 107 publications

(86 citation statements)

References 44 publications

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“…In this article, solid‐state polymer electrolyte membranes (PEM) were fabricated by means of photopolymerization of ternary mixtures consisted of poly(ethylene glycol) diacrylate (PEGDA) polymer precursor, succinonitrile (SCN) plasticizer, and lithium bis (trifluoromethyl sulfonyl)imide (LiTFSI) salt. Phase diagrams, ionic conductivity, Li‐ion transference number and mechanical properties of these PEMs have been reported previously and interested readers are referred to the original papers . The present PEMs are not only excellent flexible ion conductors for solid‐state Li‐ion batteries, but also capable of generating electrical voltage/current when subjected to mechanical bending deformation.…”

Section: Introductionmentioning

confidence: 65%

Mechanoelectrical Conversion in Highly Ionic Conductive Solid‐State Polymer Electrolyte Membranes

Cao

Kyu

2019

Macro Materials & Eng

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A novel phenomenon of mechanoelectrical conversion in a flexible solid‐state polymer electrolyte membrane (PEM) is presented, hereafter denoted as flexoelectric effect. The flexoelectric coefficient (≈323 µC m−1), that is, a measure of the converted mechanoelectrical energy, is the highest among all flexoelectric materials hitherto reported. It is proposed in this work that the flexoelectricity in PEMs operates based on electrical energy generation driven by ion polarization/depolarization across the PEM subjected to a pressure gradient during bending. Of particular interest is the phenomenon of polarity switching during bending, that is, reversal of the polarization direction with increasing succinonitrile (SCN) concentration (i.e., 10–20 wt%). The size disparity between the solvated cations and anions is attributed as the key factor in determining the polarization direction, which is responsible for the polarity switching. Of particular importance is that the present flexoelectric PEM itself is a key component of the solid‐state lithium ion battery and thus their integration opens up a new avenue for energy harvesting and storage devices.

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Section: Introductionmentioning

confidence: 65%

Mechanoelectrical Conversion in Highly Ionic Conductive Solid‐State Polymer Electrolyte Membranes

Cao

Kyu

2019

Macro Materials & Eng

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“…An elastic LIB electrolyte has not yet been reported. Some crosslinked plasticized and gel electrolytes appear to be elastic, but no detailed mechanical characterizations were provided on their elasticity. Even so, the mechanical resilience of these and other crosslinked electrolytes is limited because they rely on only a single type of covalent crosslinking junction .…”

mentioning

confidence: 99%

“…Some crosslinked plasticized and gel electrolytes appear to be elastic, but no detailed mechanical characterizations were provided on their elasticity. Even so, the mechanical resilience of these and other crosslinked electrolytes is limited because they rely on only a single type of covalent crosslinking junction . Meanwhile, secondary sacrificial crosslinks have recently been reported to significantly improve the mechanical properties of elastomers .…”

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confidence: 99%

A Dual‐Crosslinking Design for Resilient Lithium‐Ion Conductors

et al. 2018

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Solid-state electrolyte materials are attractive options for meeting the safety and performance needs of advanced lithium-based rechargeable battery technologies because of their improved mechanical and thermal stability compared to liquid electrolytes. However, there is typically a tradeoff between mechanical and electrochemical performance. Here an elastic Li-ion conductor with dual covalent and dynamic hydrogen bonding crosslinks is described to provide high mechanical resilience without sacrificing the room-temperature ionic conductivity. A solid-state lithium-metal/LiFePO cell with this resilient electrolyte can operate at room temperature with a high cathode capacity of 152 mAh g for 300 cycles and can maintain operation even after being subjected to intense mechanical impact testing. This new dual crosslinking design provides robust mechanical properties while maintaining ionic conductivity similar to state-of-the-art polymer-based electrolytes. This approach opens a route toward stable, high-performance operation of solid-state batteries even under extreme abuse.

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“…Quite recently, the effects of molecular weight of network precursors on the properties of solid‐state polymer electrolyte membranes (PEMs) comprised of PEGDA prepolymer, SCN plasticizer and LiTFSI salt using various PEGDA molecular weights have been investigated . The ternary phase diagrams of PEM precursor mixtures were also established to provide guidance for the crosslinking reaction.…”

Section: (Meth)acrylated Pegs As Electrolyte Membranesmentioning

confidence: 99%

“…Transparent and flexible PEM fabricated by photo‐polymerizing a 20/40/40 PEGDA6000/SCN/LiTFSI isotropic blend, with good deformability, including (a) bendability and (b) twistability. (c) Tensile stress–strain curves of various PEMs showing improved tensile strength and elongation at break with increasing molecular weight of PEGDA prepolymer . Copyright 2016.…”

Section: (Meth)acrylated Pegs As Electrolyte Membranesmentioning

confidence: 99%

(Meth)acrylated poly(ethylene glycol)s as precursors for rheology modifiers, superplasticizers and electrolyte membranes: a review

2017

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This review summarizes current trends in (meth)acrylated poly(ethylene glycol) (PEG) systems in the last decade, with a specific focus on their most important applications, including associative rheology modifiers, superplasticizers and electrolyte membranes. Associative rheology modifiers based on (meth)acrylated PEGs have significantly contributed to improvement of the application characteristics of waterborne coatings. These materials are employed by paint formulators to provide proper viscosity profiles across an entire shear range encountered in various paint applications. In the cement and concrete industry, superplasticizers derived from (meth)acrylated PEGs have also opened the doors to advances in this area, because of their ability to produce cementitious materials with lower water content and without compromising workability. In addition, development of solid electrolyte membranes based on photo-curable (meth)acrylated PEGs for use in polymer lithium ion batteries has recently attracted increasing attention in the energy storage industry. This review provides a comprehensive overview of the structural investigations and applications of (meth)acrylated PEGs and serves as a starting point for future studies.Over the past few decades, one of the major challenges in the energy storage industry has been developing solid electrolytes

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Highly conductive solvent-free polymer electrolyte membrane for lithium-ion batteries: Effect of prepolymer molecular weight

Cited by 107 publications

References 44 publications

Mechanoelectrical Conversion in Highly Ionic Conductive Solid‐State Polymer Electrolyte Membranes

Mechanoelectrical Conversion in Highly Ionic Conductive Solid‐State Polymer Electrolyte Membranes

A Dual‐Crosslinking Design for Resilient Lithium‐Ion Conductors

(Meth)acrylated poly(ethylene glycol)s as precursors for rheology modifiers, superplasticizers and electrolyte membranes: a review

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