Enhanced ion conduction in imidazolium-type molten salts

Ito, Kaori; Nishina, Naoko; Ohno, Hiroyuki

doi:10.1016/s0013-4686(99)00335-7

Cited by 106 publications

(75 citation statements)

References 7 publications

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“…2 and 3 show that the specific conductivities of the AICI3-BPC and AICI3-EMIC systems increase nearly linearly with the temper ature, which is not the case for the AICI3-BTEAC system ( Figure 4). These conductivities were fitted by the Arrhenius equation [9][10][11][12] …”

Section: Resultsmentioning

confidence: 99%

Conductivities of Room Temperature Molten Salts Containing AlCl₃, Measured by a Computerized Direct Current Method

Hsu

Yang

2001

Zeitschrift Für Naturforschung A

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The conductivities of the binary room-temperature molten salt systems AlCl3-yV-«-butylpyridinium chloride (BPC), AlCl3-l-ethyl-3-methylimidazolium chloride (EMIC) and AlCl3-benzyltriethylammonium chloride (BTEAC) have been measured at different temperatures and compositions by a d.c. fourprobes method.There is a maximum of the conductivity at 50 mol% A1C13 in the A1C13-BPC and A1C13-EMIC systems at 40 to 80 °C, their activation energies being relatively low (20.79 and 14.76 kJ/mol, respec tively). As to the A1C13-BTEAC system, there is an irregular change in the conductivity at 40-70 mol% A1C13 in the temperature range 50 to 80 °C. The conductivities of the three RTMS are in the order A1C13-EMIC > A1C13-BPC > A1C13-BTEAC, the reason being discussed.

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Section: Resultsmentioning

confidence: 99%

Conductivities of Room Temperature Molten Salts Containing AlCl₃, Measured by a Computerized Direct Current Method

Hsu

Yang

2001

Zeitschrift Für Naturforschung A

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“…To avoid an increase in T g , we have tried several different chemical modifications such as introduction of flexible spacer group in between polymerizable group and charge site. 103 Copolymerization of ionic liquid monomer and flexible chain containing monomer is also effective to improve selective ion conductive properties. For this, the two monomers shown in Fig.…”

Section: Polymerization Of Ionic Liquidsmentioning

confidence: 99%

Functional Design of Ionic Liquids

Ohno

2006

Bulletin of the Chemical Society of Japan

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246

158

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Ionic liquids, molten salts at temperatures lower than 100 C, preferably below room temperature, are unique liquids having very different characteristics from ordinary molecular liquids. Since these ionic liquids are prepared by coupling relatively large organic ions, there are many chances to create novel functionalities by changing structure of component ions. To develop such novel and functional ionic liquids, we first developed a facile preparation method, i.e., neutralization of tertiary amines with organic acids. By this convenient method, we prepared hundreds of salts having low melting points. We, then, tried to prepare ionic salts containing small ions such as lithium cation, proton, or chloride anion. Because small ions received stronger electrostatic force due to higher surface charge density, which results in the formation of salts with higher melting points, case must be taken. Ionic liquids containing halogen-free salts are another interesting subject to challenge from the viewpoint of environmentally friendly materials. Heteroaromatic rings such as azolates gave excellent ionic liquids having very low viscosity by coupling with suitable cations. Amino acids have also been used as anions to prepare salts with low melting points or amorphous glasses. They are helpful to analyze the relationship between ion structure and characteristics of the salts. Zwitterions, in which both cation and anion were tethered with a covalent bond, were prepared to function as ionic liquids. These ions should not migrate under a potential gradient and should be an excellent ion conductive matrix for added ions. Tethering of ions caused the T m to be high, and the zwitterions with melting points around room temperature have not been synthesized yet. However, lots of solid zwitterions became liquids by adding suitable solid salts or acid such as lithium bis(trifluoromethanesulfonyl)imide. In this mixture, lithium cations had a transport number higher than 0.5, meaning that the lithium cations are the major mobile ions in the mixture. Some of the functionality is achieved by dimension control, such as polymerization of ions, and so on. Other functional modifications and design of ionic liquids are also mentioned.

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“…Recently new types of di-cationic attracted increasing attention from both industrial and academic fields. Compared to traditional monocationic, these di-cationic ILs are new structures characterized by the presence of a doubly charged cation that is composed of two singly charged cations linked by an alkyl chain and paired with two singly charged anions [2,3]. One of the most interesting features of ILs is that they have controllable physiochemical and solvation properties.…”

Section: Introductionmentioning

confidence: 99%

Bis-methyl imidazolium methylidene bis(trifluoromethanesulfonyl)imide, crystal structure, thermal and dielectric studies

et al. 2016

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A new geminal di-cationic ionic liquid (IL) containing a central cationic unit methylidene capped by a basic functionality (imidazole) is synthesized. The compound was characterized by means of 1 H, 13 C, 19 F NMR, IR and Raman spectroscopies and its crystal structure is confirmed by single crystal X-ray diffraction method. The X-ray studies on ([M(CH 2 )IM 2+ ][2NTf −2 ]) show that it crystallizes in monoclinic system with space group: P 21/c. Thermal properties were investigated in the temperature range from 0 to 400 • C by using differential thermal (DTA) and thermogravimetric (TGA) analyses. The frequency-dependent electrical data are discussed using complex dielectric permittivity in the frequency range of (10 −2 -10 6 Hz) and in the temperature range of −50 • to 20 • C. The outstanding dielectric and thermal properties make this IL as promising candidate for electrochemical devices.

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Enhanced ion conduction in imidazolium-type molten salts

Cited by 106 publications

References 7 publications

Conductivities of Room Temperature Molten Salts Containing AlCl₃, Measured by a Computerized Direct Current Method

Conductivities of Room Temperature Molten Salts Containing AlCl₃, Measured by a Computerized Direct Current Method

Functional Design of Ionic Liquids

Bis-methyl imidazolium methylidene bis(trifluoromethanesulfonyl)imide, crystal structure, thermal and dielectric studies

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Enhanced ion conduction in imidazolium-type molten salts

Cited by 106 publications

References 7 publications

Conductivities of Room Temperature Molten Salts Containing AlCl3, Measured by a Computerized Direct Current Method

Conductivities of Room Temperature Molten Salts Containing AlCl3, Measured by a Computerized Direct Current Method

Functional Design of Ionic Liquids

Bis-methyl imidazolium methylidene bis(trifluoromethanesulfonyl)imide, crystal structure, thermal and dielectric studies

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Product

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Conductivities of Room Temperature Molten Salts Containing AlCl₃, Measured by a Computerized Direct Current Method

Conductivities of Room Temperature Molten Salts Containing AlCl₃, Measured by a Computerized Direct Current Method