Design of Ionic Liquids for Electrochemical Applications

2004 ◽  
Vol 57 (2) ◽  
pp. 139 ◽  
Author(s):  
Masahiro Yoshizawa ◽  
Asako Narita ◽  
Hiroyuki Ohno
Keyword(s):  
Ionic Liquids ◽  
Ionic Conductivity ◽  
Lithium Salt ◽  
Liquid Lithium ◽  
Melting Points ◽  
Salt Mixture ◽  
Liquid Salt ◽  
Electrochemical Applications ◽  
Salt Mixtures ◽  
The Relationship

Zwitterionic liquids composed of a tethered cation and anion were synthesized and their thermal properties and ionic conductivity were investigated as novel ionic liquids especially for electrochemical applications. We prepared nine zwitterions in this study. In addition, this paper includes 36 kinds of zwitterions already reported in order to discuss the relationship between the zwitterion structure and their properties. Most zwitterions melt above 100°C; their melting points are generally higher than that of simple ionic liquids. When an equimolar amount of lithium salt (LiTFSI, LiBETI, LiCF3SO3, LiBF4, or LiClO4) was added to the zwitterion, the mixture showed only a glass transition temperature Tg. The Tg values of the zwitterionic liquid/salt mixture showed the lowest value of –37°C when mixed with LiTFSI. This mixture also showed the highest ionic conductivity of 8.9 × 10–4 S cm–1 at 100°C. There is a good relationship between Tg and the ionic conductivity of the zwitterionic liquid/lithium salt mixtures.

Phase Behavior and Crystalline Phases of Ionic Liquid-Lithium Salt Mixtures with 1-Alkyl-3-methylimidazolium Salts†

2010 ◽  
Vol 22 (3) ◽  
pp. 1203-1208 ◽  
Author(s):  
Qian Zhou ◽  
Kendall Fitzgerald ◽  
Paul D. Boyle ◽  
Wesley A. Henderson
Keyword(s):  
Ionic Liquid ◽  
Phase Behavior ◽  
Lithium Salt ◽  
Liquid Lithium ◽  
Crystalline Phases ◽  
Salt Mixtures

Modeling Ionic Liquid Based Electrolytes for Lithium Batteries

2013 ◽  
Author(s):  
Soumik Banerjee
Keyword(s):  
Ionic Liquids ◽  
Energy Storage ◽  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Specific Energy ◽  
Lithium Salt ◽  
Lithium Ion ◽  
Ionic Species ◽  
Specific Power ◽  
Energy Storage Devices

Based on ever-growing societal demand for stable energy supply, recent times have witnessed an increasing emphasis on developing energy storage devices such as batteries with improved specific energy and specific power. Among the myriad energy-storage technologies, rechargeable lithium ion batteries are widely used as energy sources for a range of portable electronic devices because of their relatively high specific energy storage capabilities [1]. However, the highest energy storage capacity achieved by a state-of-the-art lithium ion battery is too low to meet current demands in larger applications such as in the automotive industry [1]. The limitation is due, in part, to the limited ionic conductivity of currently used organic electrolytes coupled with their volatility, electrochemical instability and flammability, which raises safety concerns. The development of new generation of lithium ion batteries with significantly improved energy storage would require the selection of novel electrolyte materials with improved performance without compromising on safety standards. In recent years, there has been growing interest in the development of room temperature ionic liquids because they have extremely low vapor pressure, are stable at high temperatures, are highly resistant to oxidation and reduction, possess high ionic conductivity and have tunable electrochemical properties. However, the ionic conductivity of ionic liquids doped with lithium salt is extremely sensitive to the molecular structure of the ions as well as the extent of coordination between neighboring ionic species. In an effort to understand how atomistic interactions determine transport properties of ionic liquids, in the current study, we simulated lithium salt doped pyrrolidinium based ionic liquids using fundamental atomistic simulations. Properties such as density and self-diffusion coefficients were determined from molecular dynamics simulations and compared to experimental data to validate our model. Our simulations indicate that the mobility of lithium ions is limited due to association with multiple salt anions.

Use of selective ionic liquids and ionic liquid/salt mixtures as entrainer in a (vapor + liquid) system to separate n -heptane from toluene

2015 ◽  
Vol 91 ◽  
pp. 156-164 ◽  
Author(s):  
Emilio J. González ◽  
Pablo Navarro ◽  
Marcos Larriba ◽  
Julián García ◽  
Francisco Rodríguez
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid System ◽  
Liquid Salt ◽  
Salt Mixtures ◽  
Vapor Liquid

Physicochemical Properties of Three Ionic Liquids Containing a Tetracyanoborate Anion and Their Lithium Salt Mixtures

2014 ◽  
Vol 118 (29) ◽  
pp. 8772-8781 ◽  
Author(s):  
Nédher Sanchez-Ramirez ◽  
Vitor L. Martins ◽  
Rômulo A. Ando ◽  
Fernanda F. Camilo ◽  
Sérgio M. Urahata ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Lithium Salt ◽  
Salt Mixtures

Development of Novel Bio-Degradable Electrolyte Based on Polylactide (PLA) for Lithium Rechargeable Battery

2013 ◽  
Vol 853 ◽  
pp. 270-275 ◽  
Author(s):  
K.W. Chew
Keyword(s):  
Ionic Conductivity ◽  
Aluminum Oxide ◽  
Lithium Salt ◽  
Ethylene Carbonate ◽  
Polymer System ◽  
Lithium Perchlorate ◽  
Salt Mixture ◽  
Degradable Polymer ◽  
Lithium Rechargeable Battery ◽  
Amorphous Nature

Development of Novel Bio-degradable Electrolyte Based on Polylactide (pla) for Lithium Rechargeable Batteryarmfu� h� r�rment, degradable polymer which is Polylactide (PLA) was chosen as the host material in the electrolyte. PLA alone had low ionic conductivity which cannot satisfy the current electrical appliance usage. Therefore, PLA is complexed with Ethylene Carbonate, Lithium perchlorate and Aluminum Oxide using THF as a wetting agent. The ionic conductivity of the electrolyte is tested with a.c impedance spectroscopy to determine its ionic conductivity. The highest ionic conductivity of pure PLA is 3.624 x 10-12 Scm-1. The PLA is mixed with Ethylene Carbonate to increase its amorphous nature. The result showed that PLA when mixed with 35% of EC give the highest conductivity which is 1.90 x 10-10 Scm-1. While the PLA mixed with 20% of Lithium perchlorate give an optimum ionic conductivity which is 5.72 x 10-7 Scm-1. Later, the ionic conductivity of PLA, EC and lithium salt mixture were carried out and shows the highest conductivity of 1.44 x 10-6 Scm-1. Lastly, with the addition of 4% aluminum oxide filler, the highest conductivity is boosted to 2.07 x 10-5 Scm-1. The samples were then analyzed using scanning electron microscope (SEM) to better understand the microstructure of the polymer system.

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