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Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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Electrodeposition01:08

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Standard Electrode Potentials03:02

Standard Electrode Potentials

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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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Ionic Bonding and Electron Transfer02:48

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Electrogravimetric Analysis: Overview01:30

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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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Ionic Bonds00:42

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
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Correlation between Electrolyte Chemistry and Solid Electrolyte Interphase for Reversible Ca Metal Anodes.

Zhen Hou1, Rui Zhou1, Yunduo Yao1

  • 1Department of Applied Physics & Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China.

Angewandte Chemie (International Ed. in English)
|October 19, 2022
PubMed
Summary
This summary is machine-generated.

Rechargeable calcium batteries face challenges from passivating interfaces. Stronger cation-solvent interactions in electrolytes create stable interfaces, enabling efficient calcium deposition and stripping for improved battery performance.

Keywords:
Ca Deposition/StrippingElectrolyte FormulationSolid Electrolyte InterphaseSolvation Structure

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable calcium metal batteries (RCMBs) are promising energy storage devices.
  • Their development is limited by the formation of passivating solid electrolyte interphases (SEIs) on the Ca metal anode.
  • The properties of SEIs are significantly influenced by the cation solvation structure within the electrolyte.

Purpose of the Study:

  • To investigate the role of cation-solvent interactions in forming stable SEIs for RCMBs.
  • To identify electrolyte compositions that promote reversible Ca deposition and stripping.
  • To demonstrate the feasibility of RCMBs with optimized electrolytes and organic cathodes.

Main Methods:

  • Systematic variation of electrolyte chemistry to control cation-solvent binding strength.
  • Analysis of SEI composition and structure using advanced characterization techniques.
  • Electrochemical testing of Ca metal anodes and RCMBs under various conditions.

Main Results:

  • Strong cation-solvent interactions, achieved through specific solvent and salt combinations, enhance Ca deposition/stripping reversibility.
  • These electrolytes promote solvent-occupied solvation structures, minimizing undesirable anion reduction.
  • The resulting SEIs are rich in organic components and low in CaF2, facilitating reversible cycling.
  • Proof-of-concept RCMBs using optimized electrolytes and organic cathodes demonstrate viable performance.

Conclusions:

  • A strong cation-solvent interaction is crucial for designing effective SEIs in RCMBs, contrary to Li metal anodes.
  • This finding represents a paradigm shift in SEI design strategies for calcium metal anodes.
  • The optimized electrolytes and demonstrated RCMBs open new avenues for advancing rechargeable calcium battery technology.