Structure–Capacitance Relationships of Graphene/Ionic Liquid Electrolyte Double Layers

2021 ◽  
Vol 125 (37) ◽  
pp. 20204-20218
Author(s):  
Yi-Jung Tu ◽  
Jesse G. McDaniel
Keyword(s):  
Ionic Liquid ◽  
Liquid Electrolyte ◽  
Double Layers ◽  
Ionic Liquid Electrolyte ◽  
Structure Capacitance

scholarly journals Modeling Lithium Transport and Electrodeposition in Ionic-Liquid Based Electrolytes

2021 ◽  
Vol 9 ◽  
Author(s):  
Guanchen Li ◽  
Charles W. Monroe
Keyword(s):  
Ionic Liquid ◽  
Electrical Response ◽  
Lithium Ion ◽  
Transference Number ◽  
Liquid Electrolyte ◽  
Double Layers ◽  
Exchange Reactions ◽  
Ionic Liquid Electrolyte ◽  
Mechanical Coupling ◽  
Chemomechanical Coupling

Purely ionic electrolytes—wherein ionic liquids replace neutral solvents—have been proposed to improve lithium-ion-battery performance, on the basis that the unique microscopic characteristics of polarized ionic-liquid/electrode interfaces may improve the selectivity and kinetics of interfacial lithium-exchange reactions. Here we model a “three-ion” ionic-liquid electrolyte, composed of a traditional ionic liquid and a lithium salt with a common anion. Newman's concentrated-solution theory is extended to account for space charging and chemomechanical coupling. We simulate electrolytes in equilibrium and under steady currents. We find that the local conductivity and lithium transference number in the diffuse double layers near interfaces differ considerably from their bulk values. The mechanical coupling causes ion size to play a crucial role in the interface's electrical response. Interfacial kinetics and surface charge on the electrodes both affect the apparent transport properties of purely ionic electrolytes near interfaces. Larger ionic-liquid cations and anions may facilitate interfacial lithium-exchange kinetics.

Enhanced Ion Transport in an Ether Aided Super Concentrated Ionic Liquid Electrolyte for Long-Life Practical Lithium Metal Battery Applications

2020 ◽  
Author(s):  
Urbi Pal ◽  
Fangfang Chen ◽  
Derick Gyabang ◽  
Thushan Pathirana ◽  
Binayak Roy ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ion Transport ◽  
Current Density ◽  
Coulombic Efficiency ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Mass ◽  
Lithium Metal ◽  
Ionic Liquid Electrolyte ◽  
Lithium Metal Battery

We explore a novel ether aided superconcentrated ionic liquid electrolyte; a combination of ionic liquid, <i>N</i>-propyl-<i>N</i>-methylpyrrolidinium bis(fluorosulfonyl)imide (C<sub>3</sub>mpyrFSI) and ether solvent, <i>1,2</i> dimethoxy ethane (DME) with 3.2 mol/kg LiFSI salt, which offers an alternative ion-transport mechanism and improves the overall fluidity of the electrolyte. The molecular dynamics (MD) study reveals that the coordination environment of lithium in the ether aided ionic liquid system offers a coexistence of both the ether DME and FSI anion simultaneously and the absence of ‘free’, uncoordinated DME solvent. These structures lead to very fast kinetics and improved current density for lithium deposition-dissolution processes. Hence the electrolyte is used in a lithium metal battery against a high mass loading (~12 mg/cm<sup>2</sup>) LFP cathode which was cycled at a relatively high current rate of 1mA/cm<sup>2</sup> for 350 cycles without capacity fading and offered an overall coulombic efficiency of >99.8 %. Additionally, the rate performance demonstrated that this electrolyte is capable of passing current density as high as 7mA/cm<sup>2</sup> without any electrolytic decomposition and offers a superior capacity retention. We have also demonstrated an ‘anode free’ LFP-Cu cell which was cycled over 50 cycles and achieved an average coulombic efficiency of 98.74%. The coordination chemistry and (electro)chemical understanding as well as the excellent cycling stability collectively leads toward a breakthrough in realizing the practical applicability of this ether aided ionic liquid electrolytes in lithium metal battery applications, while delivering high energy density in a prototype cell.

High energy density supercapacitor based on N/B co-doped graphene nanoarchitectures and ionic liquid electrolyte

Ionics ◽  
2019 ◽  
Vol 25 (9) ◽  
pp. 4351-4360 ◽  
Author(s):  
Zhongliang Yu ◽  
Jiahe Zhang ◽  
Chunxian Xing ◽  
Lei Hu ◽  
Lili Wang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Energy Density ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Energy Density ◽  
Ionic Liquid Electrolyte ◽  
Doped Graphene ◽  
Co Doped

Surface modification of TiO2 by an ionic liquid electrolyte in dye-sensitized solar cells using a molecular insulator

RSC Advances ◽  
2015 ◽  
Vol 5 (43) ◽  
pp. 33855-33862 ◽  
Author(s):  
Molang Cai ◽  
Xu Pan ◽  
Weiqing Liu ◽  
John Bell ◽  
Songyuan Dai
Keyword(s):  
Ionic Liquid ◽  
Surface Modification ◽  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Liquid Electrolyte ◽  
Electron Recombination ◽  
Ionic Liquid Electrolyte ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

DMImBS is used as a novel additive in dye-sensitized solar cells to restrain the electron recombination and intercalation of Li+.

CuP2 /C Composite Negative Electrodes for Sodium Secondary Batteries Operating at Room-to-Intermediate Temperatures Utilizing Ionic Liquid Electrolyte

2018 ◽  
Vol 5 (10) ◽  
pp. 1340-1344 ◽  
Author(s):  
Shubham Kaushik ◽  
Jinkwang Hwang ◽  
Kazuhiko Matsumoto ◽  
Yuta Sato ◽  
Rika Hagiwara
Keyword(s):  
Ionic Liquid ◽  
Liquid Electrolyte ◽  
Ionic Liquid Electrolyte ◽  
Negative Electrodes

Electrosynthesis of novel photochemically active inherently conducting polymers using an ionic liquid electrolyte

2006 ◽  
Vol 51 (12) ◽  
pp. 2471-2476 ◽  
Author(s):  
Paul S. Murray ◽  
Stephen F. Ralph ◽  
Chee O. Too ◽  
Gordon G. Wallace
Keyword(s):  
Ionic Liquid ◽  
Conducting Polymers ◽  
Liquid Electrolyte ◽  
Ionic Liquid Electrolyte
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