Co-polymerization and blending based PEO/PMMA/P(VDF-HFP) gel polymer electrolyte for rechargeable lithium metal batteries

Shi, Juan; Yang, Yuxin; Shao, Huixia

doi:10.1016/j.memsci.2017.10.033

Cited by 197 publications

(67 citation statements)

References 41 publications

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“…Therefore, polymer electrolytes are usually transformed to polymer gels by gelification with polar aprotic liquids, which largely enhance the ionic mobility [16,17,18,19]. An additional improvement is expected by the use of polymers with immobilized anions (= polyanions) whose charge is compensated by mobile lithium ions.…”

Section: Introductionmentioning

confidence: 99%

Boron Trifluoride Anionic Side Groups in Polyphosphazene Based Polymer Electrolyte with Enhanced Interfacial Stability in Lithium Batteries

Schmohl

Wiemhöfer

2018

Polymers

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A modified polyphosphazene was synthesized using a mixed substitution at phosphorus consisting of 2-(2-methoxyethoxy)ethoxy side groups and anionic trifluoroborate groups. The primary goal was to increase the low lithium ion conductivities of the conventional lithium salt containing poly[2-(2-methoxyethoxy)ethoxy-phosphazene] (MEEP) by the immobilized anionic groups. As in previous studies, the mechanical stability was stabilized by UV induced radiation cross linking. By variation of the molar ratio between different side groups, mechanical and electrochemical properties are controllable. The polymer demonstrated large electrochemical stability windows ranging between 0 and 4.5 V versus the Li/Li+ reference. Total and lithium conductivities of 3.6 × 10−4 S·cm−1 and 1.8 × 10−5 S·cm−1 at 60 °C were revealed for the modified MEEP. When observed in special visualization cells, dendrite formation onset time and short-circuit time were determined as 21 h and 90 h, respectively, under constant current polarization (16 h and 65 h for MEEP, both with 15 wt % LiBOB), which hints to a more stable Li/polymer interface compared to normal MEEP. The enhanced dendrite suppression ability can be explained by the formation of a more conductive solid electrolyte interphase (SEI) and the existence of F-contained SEI components (such as LiF). With the addition of ethylene carbonate–dimethyl carbonate (EC/DMC) to form MEE-co-OBF3P gel polymer, both total and lithium conductivity were enhanced remarkably, and the lithium transference numbers reached reasonable values (σtotal = 1.05 mS·cm−1, σLi+ = 0.22 mS·cm−1, tLi+ = 0.18 at 60 °C).

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Section: Introductionmentioning

confidence: 99%

Boron Trifluoride Anionic Side Groups in Polyphosphazene Based Polymer Electrolyte with Enhanced Interfacial Stability in Lithium Batteries

Schmohl

Wiemhöfer

2018

Polymers

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“…PVDF-HFP/PEO GPE was 2.4 mS.cm −1 at 25 • C typically. The incorporation of PEO into PVDF-HFP significantly enhances ionic conductivity, which was explained by two reasons: (i) an increase in electrolyte absorption (due to increased porosity and amorphous structure of the membrane); (ii) flexibility of PEO circuit segments and conducting mechanism based on good "solvate" ability of the sodium ion with OCH 2 groups ("hopping" mechanism; reduction of interaction between Na + and ClO 4 − ions) which increase the mobility of sodium ions in favor of soaring ionic conductivity 10,14 . Additionally, as seen in the IR spectra, PEO blended PVDF-HFP did not have any change in the functional groups of PEO and PVDF-HFP in the blended membrane, indicating that blended polymers do not have any formation of chemical bonding and that PEO decreased principally the crystallinity of the PVDF-HFP/PEO samples.…”

Section: Discussionmentioning

confidence: 99%

Physical-chemical and electrochemical properties of sodium ion conducting polymer electrolyte using copolymer poly(vinylidene fluoride- hexafluoropropylene) (PVDF-HFP)/ polyethylene oxide (PEO)

Vo¹,

Phung²,

Truong³

et al. 2019

Sci. Tech. Dev. J.

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Introduction: Polymers acting as both an electrolyte and a separator are of tremendous interest because of their many virtues, such as no leakage, flexible geometry, excellent safe performance, and good compatibility with electrodes, compared with their liquid counterparts. In this study, polymer electrolyte membranes comprising of poly(vinylidene fluorine-co-hexafluoropropylene) [PVDF-HFP] were plasticized with different mass ratios of poly(ethylene oxide) (PEO) in 1 M NaClO4/PC solutions, and were prepared and characterized in sodium-ion battery. Methods: Polymer electrolyte membranes were prepared by solution-casting techniques. The membranes' performance was evaluated in terms of morphology, conductivity, electrochemical stability, thermal properties and miscibility structure. The following various characterization methods were used: Scanning Electron Microscopy (SEM), impedance spectroscopy (for determination of electrolyte resistance), cyclic voltammetry, thermal degradation analysis, and infra-red spectroscopy (for determination of structure of co-polymer). Results: It was indicated that the PVDF-HFP/PEO membrane with 40 % wt. PVDF-HFP absorbed electrolytes up to 300 % of its weight and had a roomtemperature conductivity of 2.75 x 10-3 Scm-1, which was better than that of pure PVDF-HFP. All polymer electrolyte films were electrochemically stable in the potential voltage range of 2-4.2 V, which could be compatible with 3-4 V sodium material electrodes in rechargeable sodium cells. Conclusion: The PVDF-HFP/PEO polymer electrolyte film is a potential candidate for sodium-ion battery in the potential range of 2-4.2 V.

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“…Up until now, numerous polymer/ liquid hybrid electrolytes along with the individual components have been studied and reported with equal intensity. These include polymer matrixes such as polyethylene oxide (PEO) and its derivate [73], poly(vinylidene fluoride) (PVDF) [74], poly(ethylene glycol) diacrylate (PEGDMA) [75], polymeric ionic liquid (PIL) and so on [76], as well as conventional liquid electrolytes and ionic liquids [77][78][79]. Here, the study of the liquid ingredients in polymer matrixes has been mainly devoted to the resolution of the diffusion issue as well as the realization of better interfacial adhesion between the two electrodes.…”

Section: Polymer/liquid Hybrid Electrolytesmentioning

confidence: 99%

Recent Advancements in Polymer-Based Composite Electrolytes for Rechargeable Lithium Batteries

Tan

Zeng

et al. 2018

Electrochem. Energ. Rev.

334

170

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In recent years, lithium batteries using conventional organic liquid electrolytes have been found to possess a series of safety concerns. Because of this, solid polymer electrolytes, benefiting from shape versatility, flexibility, low-weight and low processing costs, are being investigated as promising candidates to replace currently available organic liquid electrolytes in lithium batteries. However, the inferior ion diffusion and poor mechanical performance of these promising solid polymer electrolytes remain a challenge. To resolve these challenges and improve overall comprehensive performance, polymers are being coordinated with other components, including liquid electrolytes, polymers and inorganic fillers, to form polymer-based composite electrolytes. In this review, recent advancements in polymer-based composite electrolytes including polymer/ liquid hybrid electrolytes, polymer/polymer coordinating electrolytes and polymer/inorganic composite electrolytes are reviewed; exploring the benefits, synergistic mechanisms, design methods, and developments and outlooks for each individual composite strategy. This review will also provide discussions aimed toward presenting perspectives for the strategic design of polymer-based composite electrolytes as well as building a foundation for the future research and development of high-performance solid polymer electrolytes.

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Co-polymerization and blending based PEO/PMMA/P(VDF-HFP) gel polymer electrolyte for rechargeable lithium metal batteries

Cited by 197 publications

References 41 publications

Boron Trifluoride Anionic Side Groups in Polyphosphazene Based Polymer Electrolyte with Enhanced Interfacial Stability in Lithium Batteries

Boron Trifluoride Anionic Side Groups in Polyphosphazene Based Polymer Electrolyte with Enhanced Interfacial Stability in Lithium Batteries

Physical-chemical and electrochemical properties of sodium ion conducting polymer electrolyte using copolymer poly(vinylidene fluoride- hexafluoropropylene) (PVDF-HFP)/ polyethylene oxide (PEO)

Recent Advancements in Polymer-Based Composite Electrolytes for Rechargeable Lithium Batteries

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