EIS and XPS Investigation on SEI Layer Formation during First Discharge on Graphite Electrode with a Vinylene Carbonate Doped Imidazolium Based Ionic Liquid Electrolyte

2018 ◽  
Vol 122 (32) ◽  
pp. 18223-18230 ◽  
Author(s):  
J. E. Morales-Ugarte ◽  
E. Bolimowska ◽  
H. Rouault ◽  
J. Santos-Peña ◽  
C. C. Santini ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Graphite Electrode ◽  
Liquid Electrolyte ◽  
Layer Formation ◽  
Vinylene Carbonate ◽  
Ionic Liquid Electrolyte ◽  
Sei Layer

scholarly journals A Rocking-Chair Proton Battery with Conducting Redox Polymer Active Materials and a Protic Ionic Liquid Electrolyte

2020 ◽  
Author(s):  
huan Wang ◽  
Rikard Emanuelsson ◽  
Christoffer Karlsson ◽  
Patric Jannasch ◽  
Maria Strømme ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Energy Storage ◽  
Liquid Electrolyte ◽  
Rechargeable Batteries ◽  
Energy Storage Materials ◽  
Layer Formation ◽  
Protic Ionic Liquid ◽  
Proton Battery ◽  
Ionic Liquid Electrolyte ◽  
Polymerization Conditions

<p>Rechargeable batteries that use redox-active organic compounds are currently considered as an energy storage technology for the future. Conducting redox polymers (CRPs) are organic materials being both electronically conducting and resilient to dissolution. While insolubility is an advantageous property for active battery materials, it complicates the processing necessary for fabricating electrodes, including electrode formulation and layer formation. Here we employ a post-deposition electro-polymerization (PDP) method, which allows for solution-processing to be used for electrode layer formation. The polymerization conditions are optimized and the underlying mechanism is studied with the final aim to produce high performance CRPs as energy storage materials. We show that quinizarin (Qz) and naphthoquinone (NQ) based CRPs can reach their theoretical capacity thorough optimization of the polymerization conditions. Combining the two CRPs, with the Qz-CRP as cathode and the NQ-CRP as anode, and a protic ionic liquid electrolyte, yields a 0.8 V proton rocking-chair battery. The conducting additive-free all-organic proton battery exhibits a capacity of 62 mAh/g and a capacity retention of 80% after 500 cycles using rapid potentiostatic charging and galvanostatic discharge at 4.5 C. </p>

scholarly journals A Rocking-Chair Proton Battery with Conducting Redox Polymer Active Materials and a Protic Ionic Liquid Electrolyte

2020 ◽  
Author(s):  
huan Wang ◽  
Rikard Emanuelsson ◽  
Christoffer Karlsson ◽  
Patric Jannasch ◽  
Maria Strømme ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Energy Storage ◽  
Liquid Electrolyte ◽  
Rechargeable Batteries ◽  
Energy Storage Materials ◽  
Layer Formation ◽  
Protic Ionic Liquid ◽  
Proton Battery ◽  
Ionic Liquid Electrolyte ◽  
Polymerization Conditions

<p>Rechargeable batteries that use redox-active organic compounds are currently considered as an energy storage technology for the future. Conducting redox polymers (CRPs) are organic materials being both electronically conducting and resilient to dissolution. While insolubility is an advantageous property for active battery materials, it complicates the processing necessary for fabricating electrodes, including electrode formulation and layer formation. Here we employ a post-deposition electro-polymerization (PDP) method, which allows for solution-processing to be used for electrode layer formation. The polymerization conditions are optimized and the underlying mechanism is studied with the final aim to produce high performance CRPs as energy storage materials. We show that quinizarin (Qz) and naphthoquinone (NQ) based CRPs can reach their theoretical capacity thorough optimization of the polymerization conditions. Combining the two CRPs, with the Qz-CRP as cathode and the NQ-CRP as anode, and a protic ionic liquid electrolyte, yields a 0.8 V proton rocking-chair battery. The conducting additive-free all-organic proton battery exhibits a capacity of 62 mAh/g and a capacity retention of 80% after 500 cycles using rapid potentiostatic charging and galvanostatic discharge at 4.5 C. </p>

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.

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