Selective Ion Transport in Organoboron Polymer Electrolytes Bearing a Mesitylboron Unit

Matsumi, Noriyoshi; Sugai, Kazunori; Ohno, Hiroyuki

doi:10.1021/ma0121666

Cited by 51 publications

(29 citation statements)

References 37 publications

(9 reference statements)

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“…23,24 This concept was extended to solid polymer electrolytes by several research groups. [25][26][27][28][29] Incorporation of organoboron unit into polymer electrolyte resulted in improved lithium transference number of the matrix. The anion trapping of boron atom worked much efficiently in IL matrix than was observed in polyether systems.…”

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confidence: 99%

“…30 Incorporation of several highly dissociable organoborate lithium salt structures into electrolyte matrix was particularly found to be effective to improve ionic conductivity. 28,29,[31][32][33][34][35] For instance, a zwitterionic molten salt 32 bearing lithium pentafluorophenylborate structure showed very high ionic conductivity as a zwitterionic molten salt.…”

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confidence: 99%

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Enhanced Ionic Conduction in Organoboron Ion Gels Facilely Designed via Condensation of Cellulose with Boric Acids in Ionic Liquids

et al. 2009

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Novel ion-gels bearing lithium borate were synthesized via condensation between cellulose and boric acids in IL. Ion-gels obtained showed high ionic conductivity comparable to IL itself. First, ion-gels containing 5 wt % and 7 wt % of cellulose were prepared in 1-allyl-3-ethylimidazolium chloride. Their ionic conductivities were evaluated by ac-impedance method after drying ion-gels thoroughly. The ion-gel including 5 wt % of cellulose exhibited higher conductivity than that including 7 wt % of cellulose. This should be because of lower activating energy under lower composition of cellulose. The effect of concentration of C 6 F 5 B(OH) 2 on ionic conductivity was also examined with varying the ratio of B(OH) 3 and C 6 F 5 B(OH) 2 . It was demonstrated that the ion-gel including greater amount of pentafluorophenylborate showed significantly enhanced ionic conductivity. Preparation of ion-gels including 1-allyl-3-ethylimidazolium formate was also examined at the cellulose concentration of 7 wt %. The ion-gels synthesized in 1-allyl-3-ethylimidazolium formate showed higher ionic conductivity (1:98 Â 10 À3 Scm À1 ; 30 C) than that synthesized in 1-allyl-3-ethylimidazolium chloride. This should be because of lower viscosity of 1-allyl-3-ethylimidazolium formate.KEY WORDS: Ion-gels / Cellulose / Boric Esters / Ionic Conduction / Ionic Liquids / After ionic liquids (ILs) 1-3 emerged as a new class of electrolytes showing unusually high ionic conductivity, ILs had become one of the most frequently employed ion conductive matrix in an amazingly short period. Expectation toward ILs as electrolyte for lithium secondary battery or fuel cell had also rapidly spread worldwide. These days, there is urgent social demanding for improvement in safety of energy storage devices. Non flammable ILs are expected to be one of key materials for the solution of such problem. To explore novel ILs showing desirable properties such as low viscosity, high electrochemical stability and selectivity of target cation transport, versatile types of ILs have been developed so far. Moreover, in view of application for energy storage devices, polymerized ILs and polymer gel electrolytes including ILs (ion gels) have also been earnestly studied. [4][5][6][7][8][9][10][11][12][13][14][15] In the present work, cellulose was employed as a supporting polymer of ion gels.In the case of poly(ethylene oxide), it is known that addition of cellulose leads to improved mechanical properties and higher ionic conductivity of the resulting matrix.16 Since chloride type ILs are known as good solvent of cellulose, [17][18][19] preparation of IL based ion gels including cellulose appears to be a promising approach to obtain dimensionally stable and highly ion conductive ion gels.In addition, it is widely known that poly(saccharide)s possess high reactivity toward boric acids. [20][21][22] As an approach to improve the selectivity of target cation transport in electrolytes or enhance ionic conductivity of matrix, incorporation of organoboron units such as boric ester, ...

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Enhanced Ionic Conduction in Organoboron Ion Gels Facilely Designed via Condensation of Cellulose with Boric Acids in Ionic Liquids

et al. 2009

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“…As anionic structure in electrolytes, borate anions such as tetrafluoroborate are frequently employed because of their reasonable stability and high ionic conductivity [12,13]. We have also reported several solid polymer electrolytes bearing dissociable borate salt structures [14][15][16]. Particularly, the polymer electrolyte bearing a pentafluorophenylborate showed markedly improved ionic conductivity.…”

Section: Introductionmentioning

confidence: 98%

Design and evaluation of imidazolium cation-based ionic liquids having double-armed anions for selective cation conduction

Shibayama

Narita

Matsumi

et al. 2009

Journal of Organometallic Chemistry

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“…[6][7][8] Organic polymers involving ionic liquid moieties in the main chain were also synthesized. [9][10][11][12] The other approach for synthesis of the ionic liquid-organic polymer hybrids is the use of physical interactions between organic polymer and ionic liquid interfaces.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, from the FE-SEM image of the transparent hybrid at high magnification (Â60 000), phenol resin and [EMI][TFSA] were observed to be integrated at a scale of a few nanometers. The transparent hybrid containing 20 wt% phenol resin showed high thermal stability and ionic conductivity (1.0Â10 À3 S cm À1 at 30 1C [3][4][5][6][7][8][9][10][11][12][13][14] However, in case of poor compatibility between organic polymer and ionic liquid, aggregation of organic polymer in ionic liquid occurred, and then ionic liquid leaked from the organic polymer matrix and the obtained composite material appeared turbid or phase separated. For preparation of homogeneous solid-state ionic liquid-organic polymer hybrids, improvement of compatibility is necessary.…”

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Transparent ionic liquid-phenol resin hybrids with high ionic conductivity

Ogoshi

Onodera

Yamagishi

et al. 2011

Polym J

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We report transparent ion conductive ionic liquid-phenol resin hybrids prepared by in situ polymerization/crosslinking of phenol monomer in ionic liquid. As ionic liquid, we used highly ion conductive ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([EMI][TFSA]). Simultaneous polymerization and crosslinking of phenol with paraformaldehyde in [EMI][TFSA] yielded a highly transparent film. From a field emission scanning electron microscope (FE-SEM) image at 5000 magnification, the transparent hybrid prepared by in situ method did not show phase separation at 5000 magnification. In addition, from the FE-SEM image of the transparent hybrid at high magnification (Â60 000), phenol resin and [EMI][TFSA] were observed to be integrated at a scale of a few nanometers. The transparent hybrid containing 20 wt% phenol resin showed high thermal stability and ionic conductivity (1.0Â10 À3 S cm À1 at 30 1C [3][4][5][6][7][8][9][10][11][12][13][14] However, in case of poor compatibility between organic polymer and ionic liquid, aggregation of organic polymer in ionic liquid occurred, and then ionic liquid leaked from the organic polymer matrix and the obtained composite material appeared turbid or phase separated. For preparation of homogeneous solid-state ionic liquid-organic polymer hybrids, improvement of compatibility is necessary. To improve compatibility, one attempt is utilizing covalent bonds between organic polymer and ionic liquid phases. By using vinyl monomers having ionic liquid moieties, organic polymers carrying ionic liquid moieties at the side chain were prepared. 6-8 Organic polymers involving ionic liquid moieties in the main chain were also synthesized. [9][10][11][12] The other approach for synthesis of the ionic liquid-organic polymer hybrids is the use of physical interactions between organic polymer and ionic liquid interfaces.

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Selective Ion Transport in Organoboron Polymer Electrolytes Bearing a Mesitylboron Unit

Cited by 51 publications

References 37 publications

Enhanced Ionic Conduction in Organoboron Ion Gels Facilely Designed via Condensation of Cellulose with Boric Acids in Ionic Liquids

Enhanced Ionic Conduction in Organoboron Ion Gels Facilely Designed via Condensation of Cellulose with Boric Acids in Ionic Liquids

Design and evaluation of imidazolium cation-based ionic liquids having double-armed anions for selective cation conduction

Transparent ionic liquid-phenol resin hybrids with high ionic conductivity

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