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Related Concept Videos

Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

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Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Electrolyte Contribution on Solid-Electrolyte Interphase (SEI) Evolution in Graphite Anodes under Rapid Cycling.

Omar Gómez Rojas1, Watcharaporn Hoisang1, Wataru Sugimoto1,2

  • 1Institute for Aqua Regeneration, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan.

ACS Applied Materials & Interfaces
|November 18, 2025
PubMed
Summary
This summary is machine-generated.

Higher lithium bis(fluorosulfonyl)imide (LiFSI) concentrations and specific ionic liquid (IL) cation choices significantly improve the cycling stability and interfacial integrity of high-rate energy storage devices. Vinylene carbonate (VC) addition creates a protective organic solid-electrolyte interphase (SEI) by suppressing cation decomposition.

Keywords:
graphite anodeshigh-rate energy storage devicesionic liquid electrolyteslithium-ion hybrid capacitorssolid-electrolyte interphase (SEI)

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-rate energy storage devices require stable interfaces for optimal performance.
  • Lithium salt concentration and ionic liquid (IL) composition critically influence interfacial behavior.
  • Understanding solid-electrolyte interphase (SEI) formation is key to enhancing device longevity.

Purpose of the Study:

  • To investigate the impact of lithium bis(fluorosulfonyl)imide (LiFSI) concentration on lithiated graphite anodes.
  • To analyze how ionic liquid (IL) cation identity affects SEI chemistry and stability during rapid cycling.
  • To evaluate the role of vinylene carbonate (VC) as an SEI-preserving additive.

Main Methods:

  • Electrochemical testing across varying LiFSI concentrations (1-4 M).
  • Detailed electrochemical and surface analyses of SEI chemistry in different IL systems (P13FSI, EmimFSI).
  • Comparative study of SEI formation with and without VC additive.

Main Results:

  • Higher LiFSI concentrations (4 M) improved cycling stability and reduced interfacial resistance.
  • P13FSI-based systems with VC formed a protective, organic-rich SEI via cation ring-opening.
  • EmimFSI-based systems without VC showed progressive SEI degradation due to cation decomposition.

Conclusions:

  • IL cation structure and LiFSI concentration are critical for SEI chemistry and device durability.
  • Targeted additives like VC can suppress cation decomposition and enhance SEI self-preservation.
  • Optimized IL/salt combinations and additive strategies are essential for high-rate energy storage systems.