Comparative study of interfacial behavior for polyphosphazene based polymer electrolytes and LiPF6 in EC/DMC against lithium metal anodes

He, Xiao-Hua; Schmohl, Sebastian; Wiemhöfer, Hans‐Dieter

doi:10.1016/j.polymertesting.2019.04.012

Cited by 10 publications

(13 citation statements)

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“…The surface understanding of phosphazene-based liquid electrolyte at the air-aqueous interface could be crucial for advancing electrochemical technologies. The understanding may elucidate the role of ion concentration, such as enhancing the hydrophobicity of the polymer membrane to stabilize the interface of Li-polymer batteries, as reported in the study by He et al [19]. Furthermore, the application of phosphazene-based PE as a surface membrane could be investigated in Li-based seawater batteries to promote polymer-salt coordination in the seawater-based electrolyte.…”

Section: Resultsmentioning

confidence: 90%

“…Comprehensively, the molecular-level insight collected through our study highlights the importance of synchronizing intermolecular forces (vdW or electrostatic forces) to predict the polymer interface propensity in the electrochemical activity, which may facilitate the motion of polymer-ion linkage. Such surface understanding can aid in designing Li-polymer batteries with stable interfaces and hydrophobic surface membranes, ensuring an efficient, sustainable, and steady energy conversion process [19].…”

Section: Resultsmentioning

confidence: 99%

“…Looking over the aspect of its application in Li-polymer batteries, the molecular structure of MEEP, along with the addition of lithium salts, has attracted the attention of many researchers aiming to elucidate the micro-scale changes that could explain the observed enhancement in ionic conductivity. A significant amount of experimental and theoretical exploration has been undertaken in the past on polyphosphazene, which primarily provides insight into the bulk properties of the polymer, where adequate information about the interfacial activities of such a crucial polymer is majorly lacking in the literature [16][17][18][19]. Nevertheless, the interfacial properties of polymer MEEP-based liquid-like electrolytes are poorly understood due to lack of studies based on surface-sensitive probing tools.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial molecular structure of phosphazene-based polymer electrolyte at the air-aqueous interface using sum frequency generation vibrational spectroscopy

Kaur,

Tomar,

Chaudhary

et al. 2023

J. Phys.: Condens. Matter

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The change induced in the physicochemical properties of polymer while hosting ions provides a platform for studying its potential applications in electrochemical devices, water treatment plants, and materials engineering science. The ability to host ions is limited in very few polymers, which lack a detailed molecular-level understanding for showcasing the polymer-ion linkage behavior at the interfacial region. In the present manuscript, we have employed sum frequency generation (SFG) vibrational spectroscopy to investigate the interfacial structure of a new class phosphazene-based methoxyethoxyethoxyphosphazene (MEEP) polymer in the presence of lithium chloride salt at the air-aqueous interface. The interfacial aspects of the molecular system collected through SFG spectral signatures reveal enhanced water ordering and relative hydrogen bonding strength at the air-aqueous interface. The careful observation of the study finds a synchronous contribution of van der Waals and electrostatic forces in facilitating changes in the interfacial water structure that are susceptible to MEEP concentration in the presence of ions. The observation indicates that dilute MEEP concentrations support the role of electrostatic interaction, leading to an ordered water structure in proximity to diffused ions at the interfacial region. Conversely, higher MEEP concentrations promote the dominance of van der Waals interactions at the air-aqueous interface. Our study highlights the establishment of polymer electrolyte (PE) characteristics mediated by intermolecular interactions, as observed through the spectral signatures witnessed at the air-aqueous interface. The investigation illustrates the polymer-ion linkage adsorption effects at the interfacial region, which explains the macroscopic changes observed from the cyclic voltammetry studies. The fundamental findings from our studies can be helpful in the design and fine-tuning of better PE systems that can offer improved hydrophobic membranes and interface stability for use in electrochemical-based power sources.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interfacial molecular structure of phosphazene-based polymer electrolyte at the air-aqueous interface using sum frequency generation vibrational spectroscopy

Kaur,

Tomar,

Chaudhary

et al. 2023

J. Phys.: Condens. Matter

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“…Jankowsky et al [72][73][74] have previously synthesized MEEP and obtained salt-in-polymer membranes. Gel polymer electrolytes were prepared by soaking a liquid salt solution containing 0.7 M LiPF 6 in ethylene carbonate-dimethyl carbonate (EC/DMC 1:1) in a salt-free cross-linked MEEP membrane [26,82,83]. Two different cells were studied and presented in the scientific literature: The Swagelok cell is symmetrical.…”

Section: Gel Polyphosphazene Electrolytesmentioning

confidence: 99%

Phosphorus-Containing Polymer Electrolytes for Li Batteries

Varan,

Merghes,

Plesu

et al. 2024

Batteries

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Lithium-ion polymer batteries, also known as lithium-polymer, abbreviated Li-po, are one of the main research topics nowadays in the field of energy storage. This review focuses on the use of the phosphorus containing compounds in Li-po batteries, such as polyphosphonates and polyphosphazenes. Li-po batteries are mini-devices, capable of providing power for any portable gadget. From a constructive point of view, Li-po batteries contain an anode (carbon), a cathode (metal oxide), and a polymer electrolyte, which could be liquid electrolytes or solid electrolytes. In general, a divider is used to keep the anode and cathode from touching each other directly. Since liquid electrolytes have a generally high ionic conductivity, they are frequently employed in Li-ion batteries. In the last decade, the research in this field has also focused on solving safety issues, such as the leakage of electrolytes and risk of ignition due to volatile and flammable organic solvents. The research topics in the field of Li-po remain focused on solving safety problems and improving performance.

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“…He et al investigated the SEI formation on lithium metal anodes with polyphosphazene GPEs. [87] It turned out that polyphosphazene GPEs inhibited the dendrite growth compared to common liquid electrolytes. The authors explained this observation can be explained by a more stable and more conductive SEI.…”

Section: Other Polymersmentioning

confidence: 99%

Polymers for Battery Applications—Active Materials, Membranes, and Binders

Saal

Hagemann

Schubert

2020

Advanced Energy Materials

110

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both large-and small-scale energy storage, ranging from large pumped hydroelectric storage to very small battery cells for handheld devices.Secondary batteries are among the more promising energy storage technologies, with a wide range of applications. [4] Since the development of the lead acid battery in the second half of the 19th century (Gaston Planté, 1860), a broad range of batteries has been invented. [5] Notable examples are the nickel/cadmium cell (1899) [6] and the lithium-ion battery, which was developed in the 1970s. [7] Today, batteries are omnipresent in the everyday lives of a large part of the world's population. They find application in numerous fields, ranging from handheld or portable devices to electric vehicles (including vehicles with combustion engines) to large-scale energy storage for renewable sources. [8] Each field has unique requirements for the applied batteries, therefore different battery types have been developed to meet the demands.The most dominant type of secondary batteries for modern devices is the lithium-ion battery. Lithium-ion batteries possess high energy densities, good rate capabilities, and a long cycle life. Since their commercialization in 1991, they have been applied in many portable devices, electric vehicles and even in large-scale energy storage systems. [7] Since 2000, the share of the worldwide produced lithium for application in batteries (35% of the total production in 2015) has increased by 20% per year. [9] Another, less known battery type is the redox-flow battery (RFB). With their independent scalability of capacity and power, they are in particular interesting for large-scale storage of renewable energy with regard to grid stability. [10] A recent, so far not commercially available type of batteries is the organic battery. Here, an organic compound (small molecule or polymer) is responsible for charge storage. Organic batteries offer high rate capabilities, cheap starting materials, and are less environmentally challenging compared to metalbased batteries. Possible fields of application are small, lightweight, and easily recyclable products. [11] None of the above-mentioned batteries would work without polymers. Polymers can be found in the electrodes, where they act as binders, ensuring a good adhesion and contact among the different materials. Furthermore, many membranes are based on polymers. Here, the macromolecules have to be ionconducting as well as mechanically and chemically robust. In addition, organic batteries rely on polymeric active materials. This review discusses the diverse possibilities polymers haveIn the light of an ever-increasing energy demand, the rising number of portable applications, the growing market of electric vehicles, and the necessity to store energy from renewable sources on large scale, there is an urgent need for suitable energy storage systems. In most batteries, the energy is stored by exploiting metals or metal-ion-based reactions. However, nearly every modern battery would not function without the help of polymer...

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Comparative study of interfacial behavior for polyphosphazene based polymer electrolytes and LiPF6 in EC/DMC against lithium metal anodes

Cited by 10 publications

References 45 publications

Interfacial molecular structure of phosphazene-based polymer electrolyte at the air-aqueous interface using sum frequency generation vibrational spectroscopy

Interfacial molecular structure of phosphazene-based polymer electrolyte at the air-aqueous interface using sum frequency generation vibrational spectroscopy

Phosphorus-Containing Polymer Electrolytes for Li Batteries

Polymers for Battery Applications—Active Materials, Membranes, and Binders

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