Influence of binary lithium salts on 49% poly(methyl methacrylate) grafted natural rubber based solid polymer electrolytes

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Abstract

Effect of binary lithium salts (lithium tetrafluoroborate, LiBF4 with lithium trifluoromethanesulfonate, LiCF3SO3) and (lithium tetrafluoroborate, LiBF4 with Lithium iodide, LiI) as charge carriers in solid polymer electrolyte based 49% poly(methyl methacrylate) grafted natural rubber (MG49) for Li-ion battery application has been investigated. The polymer electrolytes were prepared by solution casting technique. The effect of binary lithium salts on chemical interaction, structural, thermal studies, ionic conductivity and ion transference number of MG49 films are analyzed by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC) and electrochemical impedance spectroscopy (EIS). Infrared analysis indicated the interaction occurred between Li ions and oxygen atoms at the carbonyl group (–C[dbnd]O) and the ether group (C–O–C) on methyl methacrylate (MMA) segments. XRD studies exhibited a reduction of the MMA peak intensity at 29.5° after the addition of different ratios of binary Li salts due to the plasticizing effect of the salts. The larger anion size tends to create bigger free volume in the polymer electrolyte. In addition, this confirms that the degree of crystallinity of the electrolyte films is reduced leading to enhancement of ionic conductivity. DSC results revealed the highest conductivity sample has the lowest Tg implying the ions can flow with more ease throughout the polymer chain. The ratios of LiBF4:LiI presenting the higher overall performance in terms of ionic conductivity comparing to LiBF4:LiCF3SO3 ratios in MG49. The highest room temperature conductivity was obtained at 1.89 × 10−6 S cm−1 for (30:70) LiBF4:LiI percentages ratio. Moreover, tion is observed to increase with the ionic conductivities.

Original languageEnglish
JournalArabian Journal of Chemistry
DOIs
Publication statusAccepted/In press - 1 Jan 2018

Fingerprint

Rubber
Polymethyl Methacrylate
Ionic conductivity
Polymethyl methacrylates
Lithium
Electrolytes
Polymers
Salts
Methacrylates
Ions
Differential scanning calorimetry
X ray diffraction
Free volume
Iodides
Charge carriers
Electrochemical impedance spectroscopy
Ether
Anions
Casting
Oxygen

Keywords

  • Binary lithium salts
  • Electrochemical characterization
  • Modified natural rubber
  • Polymer electrolyte

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

@article{41630200523d48e48411a8b446a74d2a,
title = "Influence of binary lithium salts on 49{\%} poly(methyl methacrylate) grafted natural rubber based solid polymer electrolytes",
abstract = "Effect of binary lithium salts (lithium tetrafluoroborate, LiBF4 with lithium trifluoromethanesulfonate, LiCF3SO3) and (lithium tetrafluoroborate, LiBF4 with Lithium iodide, LiI) as charge carriers in solid polymer electrolyte based 49{\%} poly(methyl methacrylate) grafted natural rubber (MG49) for Li-ion battery application has been investigated. The polymer electrolytes were prepared by solution casting technique. The effect of binary lithium salts on chemical interaction, structural, thermal studies, ionic conductivity and ion transference number of MG49 films are analyzed by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC) and electrochemical impedance spectroscopy (EIS). Infrared analysis indicated the interaction occurred between Li ions and oxygen atoms at the carbonyl group (–C[dbnd]O) and the ether group (C–O–C) on methyl methacrylate (MMA) segments. XRD studies exhibited a reduction of the MMA peak intensity at 29.5° after the addition of different ratios of binary Li salts due to the plasticizing effect of the salts. The larger anion size tends to create bigger free volume in the polymer electrolyte. In addition, this confirms that the degree of crystallinity of the electrolyte films is reduced leading to enhancement of ionic conductivity. DSC results revealed the highest conductivity sample has the lowest Tg implying the ions can flow with more ease throughout the polymer chain. The ratios of LiBF4:LiI presenting the higher overall performance in terms of ionic conductivity comparing to LiBF4:LiCF3SO3 ratios in MG49. The highest room temperature conductivity was obtained at 1.89 × 10−6 S cm−1 for (30:70) LiBF4:LiI percentages ratio. Moreover, tion is observed to increase with the ionic conductivities.",
keywords = "Binary lithium salts, Electrochemical characterization, Modified natural rubber, Polymer electrolyte",
author = "Whba, {R. A.G.} and L. TianKhoon and Su'ait, {Mohd Sukor} and {Abd Rahman}, {Mohd Yusri} and Azizan Ahmad",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.arabjc.2018.11.009",
language = "English",
journal = "Arabian Journal of Chemistry",
issn = "1878-5352",
publisher = "King Saud University",

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TY - JOUR

T1 - Influence of binary lithium salts on 49% poly(methyl methacrylate) grafted natural rubber based solid polymer electrolytes

AU - Whba, R. A.G.

AU - TianKhoon, L.

AU - Su'ait, Mohd Sukor

AU - Abd Rahman, Mohd Yusri

AU - Ahmad, Azizan

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Effect of binary lithium salts (lithium tetrafluoroborate, LiBF4 with lithium trifluoromethanesulfonate, LiCF3SO3) and (lithium tetrafluoroborate, LiBF4 with Lithium iodide, LiI) as charge carriers in solid polymer electrolyte based 49% poly(methyl methacrylate) grafted natural rubber (MG49) for Li-ion battery application has been investigated. The polymer electrolytes were prepared by solution casting technique. The effect of binary lithium salts on chemical interaction, structural, thermal studies, ionic conductivity and ion transference number of MG49 films are analyzed by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC) and electrochemical impedance spectroscopy (EIS). Infrared analysis indicated the interaction occurred between Li ions and oxygen atoms at the carbonyl group (–C[dbnd]O) and the ether group (C–O–C) on methyl methacrylate (MMA) segments. XRD studies exhibited a reduction of the MMA peak intensity at 29.5° after the addition of different ratios of binary Li salts due to the plasticizing effect of the salts. The larger anion size tends to create bigger free volume in the polymer electrolyte. In addition, this confirms that the degree of crystallinity of the electrolyte films is reduced leading to enhancement of ionic conductivity. DSC results revealed the highest conductivity sample has the lowest Tg implying the ions can flow with more ease throughout the polymer chain. The ratios of LiBF4:LiI presenting the higher overall performance in terms of ionic conductivity comparing to LiBF4:LiCF3SO3 ratios in MG49. The highest room temperature conductivity was obtained at 1.89 × 10−6 S cm−1 for (30:70) LiBF4:LiI percentages ratio. Moreover, tion is observed to increase with the ionic conductivities.

AB - Effect of binary lithium salts (lithium tetrafluoroborate, LiBF4 with lithium trifluoromethanesulfonate, LiCF3SO3) and (lithium tetrafluoroborate, LiBF4 with Lithium iodide, LiI) as charge carriers in solid polymer electrolyte based 49% poly(methyl methacrylate) grafted natural rubber (MG49) for Li-ion battery application has been investigated. The polymer electrolytes were prepared by solution casting technique. The effect of binary lithium salts on chemical interaction, structural, thermal studies, ionic conductivity and ion transference number of MG49 films are analyzed by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC) and electrochemical impedance spectroscopy (EIS). Infrared analysis indicated the interaction occurred between Li ions and oxygen atoms at the carbonyl group (–C[dbnd]O) and the ether group (C–O–C) on methyl methacrylate (MMA) segments. XRD studies exhibited a reduction of the MMA peak intensity at 29.5° after the addition of different ratios of binary Li salts due to the plasticizing effect of the salts. The larger anion size tends to create bigger free volume in the polymer electrolyte. In addition, this confirms that the degree of crystallinity of the electrolyte films is reduced leading to enhancement of ionic conductivity. DSC results revealed the highest conductivity sample has the lowest Tg implying the ions can flow with more ease throughout the polymer chain. The ratios of LiBF4:LiI presenting the higher overall performance in terms of ionic conductivity comparing to LiBF4:LiCF3SO3 ratios in MG49. The highest room temperature conductivity was obtained at 1.89 × 10−6 S cm−1 for (30:70) LiBF4:LiI percentages ratio. Moreover, tion is observed to increase with the ionic conductivities.

KW - Binary lithium salts

KW - Electrochemical characterization

KW - Modified natural rubber

KW - Polymer electrolyte

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JO - Arabian Journal of Chemistry

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