Enhanced Li+ conductivity in PEO–LiBOB polymer electrolytes by using succinonitrile as a plasticizer

Wu, Xing‐Long; Xin, Sen; Seo, Hyun-Ho; Kim, Jaekook; Guo, Yu‐Guo; Lee, Jong‐Sook

doi:10.1016/j.ssi.2011.01.010

Cited by 100 publications

(62 citation statements)

References 33 publications

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“…The ionic conductivity of SPEs increased with increasing LiDFOB concentration and reached maximum and then decreased with further increasing LiDFOB content. The highest ionic conductivity σ∼3.18×10 −5 S/cm was obtained for the sample EO/Li molar ratio 10 at room temperature (23°C) which is higher than other polymer electrolyte systems PEO-LiBF 4 and PEO-LiBOB [50,51]. The increased ionic conductivity was mainly due to increase of the number of charge carriers (Li + and DFOB¯) when increasing the salt concentration.…”

Section: Conductivity Studiesmentioning

confidence: 83%

Poly(ethylene oxide)-lithium difluoro(oxalato)borate new solid polymer electrolytes: ion–polymer interaction, structural, thermal, and ionic conductivity studies

Polu

Kim

Rhee

2015

Ionics

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Solid polymer electrolytes based on high molecular weight poly(ethylene oxide) (PEO) complexed with lithium difluoro(oxalato)borate (LiDFOB) salt in various EO:Li molar ratios from 30:1 to 8:1 were prepared by using solution casting technique. Ion-polymer interaction, structural, thermal, and ionic conductivity studies have been reported by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), polarized optical microscopy (POM), differential scanning calorimeter (DSC), and impedance analysis. FTIR spectral studies suggested that the interaction of Li + cations with the ether oxygen of PEO, where a triple peak broad band centered at 1105 cm −1 , corresponds to C-O-C stretching and extreme deformation occurs. XRD, POM, and DSC indicated that the inclusion of LiDFOB salt could reduce the crystallinity of PEO. The melting temperature of PEO shifted to lower temperature side by the addition of LiDFOB. The glass transition temperature obtained for the system 10:1 was −38.2°C. An increase in the ionic conductivity from 3.95×10 −9 to 3.18× 10 −5 S/cm at room temperature (23°C) was obtained through the addition of LiDFOB to a high molecular weight PEO. In addition, the ionic conductivity of the polymer electrolyte films followed an Arrhenius relation, and the activation energy decreased with increasing LiDFOB concentration.

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Section: Conductivity Studiesmentioning

confidence: 83%

Poly(ethylene oxide)-lithium difluoro(oxalato)borate new solid polymer electrolytes: ion–polymer interaction, structural, thermal, and ionic conductivity studies

Polu

Kim

Rhee

2015

Ionics

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“…where x c is the relative percentage of crystallinity of the PEO-based polymer electrolyte, and DH PEO is the DH m of 100% crystalline PEO (203 JÁg À1 ) [28,29]. As shown in Table 1, the melting heat (DH m ) and T m of pure PEO are 149.7 J/g and 66.2 C, respectively; x c of the present pure PEO is about 73.7%.…”

Section: Phase Behaviormentioning

confidence: 95%

A new composite solid electrolyte PEO/Li10GeP2S12/SN for all-solid-state lithium battery

Chen

Huang

Chen

et al. 2016

Electrochimica Acta

194

111

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“…After LiTDI inclusion, the peaks of PEO shifted to lower 2h values due to increase of the interplanar crystal spacing of PEO which may have occurred from the insertion of large TDI anions into PEO lattice. In all XRD patterns of polymer electrolytes, no diffraction peak of either LiTDI or SN [20] is found, demonstrating that the added lithium salt and plasticizer have well dissolved into the PEO matrix. With the incorporation of LiTDI and SN decreased the intensity of the peaks and broader than pure PEO.…”

Section: Xrd Analysismentioning

confidence: 96%

“…Measurements were performed under a nitrogen atmosphere from -100 to 100°C at heating rate of 10°C/ min. The crystallinity (v c ) was determined from DSC thermograms using the following equation: where DH 0 m is the standard enthalpy of fusion of pure PEO (203 J g -1 ) [20] and DH m is the enthalpy of fusion of the solid polymer electrolyte. The thermogravimetry (TG) measurements were carried out on a TGA-2950 thermal analyzer (Hi-Res, TA instruments) by heating from 25 to 500°C under a N 2 atmosphere at a heating rate of 20°C/ min, with a sample about 7 mg. Impedance and conductivity of the samples was determined using an Iviumstat (Ivium Technologies, Netherlands).…”

Section: Characterizationmentioning

confidence: 99%

New solid polymer electrolytes (PEO20–LiTDI–SN) for lithium batteries: structural, thermal and ionic conductivity studies

Polu

Rhee

Kim

2015

J Mater Sci: Mater Electron

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Solid polymer electrolyte films based on Poly(ethylene oxide) (PEO) have been prepared by solution casting technique using acetonitrile as a solvent. Succinonitrile (SN) was used as a plasticizer and lithium 4,5-dicyano-2-(trifluoromethyl)imidazole (LiTDI) as a doping salt. The following techniques such as X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermo gravimetric analysis, AC-impedance analysis and linear sweep voltametry have been employed to characterize the prepared solid polymer electrolyte films. The crystalline and amorphous nature of polymer electrolytes was confirmed by XRD and DSC analysis respectively. The electrolyte film with 30 wt% of SN was thermally stable up to 260°C. The ionic conductivities of polymer electrolyte films were calculated from the AC-impedance analysis. The undoped PEO 20 -LiTDI electrolyte exhibited the ionic conductivity of 9.64 9 10 -7 S cm -1 and this value was increased to 2.83 9 10 -5 S cm -1 when 30 wt% of succinonitrile was added to PEO 20 -LiTDI electrolyte at 23°C. The temperature dependent conductivity obeys Arrhenius behavior and the activation energy decreased to 0.264 eV. The electrochemical stability of the optimum conducting composition is 4.3 V, which make it attractive as electrolyte for Li battery.

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Enhanced Li+ conductivity in PEO–LiBOB polymer electrolytes by using succinonitrile as a plasticizer

Cited by 100 publications

References 33 publications

Poly(ethylene oxide)-lithium difluoro(oxalato)borate new solid polymer electrolytes: ion–polymer interaction, structural, thermal, and ionic conductivity studies

Poly(ethylene oxide)-lithium difluoro(oxalato)borate new solid polymer electrolytes: ion–polymer interaction, structural, thermal, and ionic conductivity studies

A new composite solid electrolyte PEO/Li10GeP2S12/SN for all-solid-state lithium battery

New solid polymer electrolytes (PEO20–LiTDI–SN) for lithium batteries: structural, thermal and ionic conductivity studies

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