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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Precipitation Processes01:12

Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Colloidal precipitates01:09

Colloidal precipitates

4.7K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

5.1K
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Factors Affecting Solubility04:01

Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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Solvent-Dependent Size Regulation of Li6PS5Cl Synthesized through Precipitation-Dissolution-Reprecipitation

Seunggu Kim1, Jaedong Kim1, Yoon-Cheol Ha2

  • 1Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

ACS Applied Materials & Interfaces
|December 1, 2025
PubMed
Summary

Researchers developed a one-pot synthesis for small, high-purity solid-state electrolyte particles, crucial for safer, high-energy lithium batteries. This method enhances interfacial contact, improving battery performance and stability.

Keywords:
Li6PS5Clall-solid-state batteriesparticle sizesulfide solid-state electrolytewet synthesis

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A Protocol for Safe Lithiation Reactions Using Organolithium Reagents
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Solid-state electrolytes (SSEs) are key for safer, high-energy lithium batteries.
  • Particle size and interfacial contact in SSEs critically impact battery performance.
  • Achieving small SSE particles (1-3 μm) is essential for intimate contact with cathode materials.

Purpose of the Study:

  • To develop a one-pot synthesis for small argyrodite-type Li6PS5Cl (LPSCl) particles.
  • To investigate the role of solvent properties in controlling particle size and purity.
  • To evaluate the electrochemical performance of LPSCl in lithium-ion full cells.

Main Methods:

  • One-pot synthesis of LPSCl using 1,2-dimethoxyethane (DME) as a solvent.
  • Utilizing DME's strong Li+ solvation to control nucleation and growth.
  • Characterization of particle size, purity, and ionic conductivity.
  • Fabrication and testing of full cells with LiNbO3-coated NCM811 cathodes.

Main Results:

  • Achieved LPSCl particles with an average size of ~2 μm without post-processing.
  • DME solvent enabled smaller, higher purity particles compared to THF or 2-methyl-THF.
  • Synthesized LPSCl exhibited superior ionic conductivity (3.3 mS cm-1) and critical current density (1.75 mA cm-2).
  • Full cells demonstrated excellent cycling stability, retaining 99.7% capacity after 1000 cycles.

Conclusions:

  • The one-pot synthesis using DME effectively produces small, high-purity LPSCl particles.
  • Enhanced interfacial contact in full cells leads to superior electrochemical performance and stability.
  • This method offers a promising route for developing advanced solid-state lithium batteries.