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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Colligative Properties of Electrolytes
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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Method Using Water-Based Solvent to Prepare Li7La3Zr2O12 Solid Electrolytes.

Xiao Huang1,2, Yang Lu1,2, Jun Jin1

  • 1CAS Key Laboratory of Materials for Energy Conversion , Shanghai Institute of Ceramics, Chinese Academy of Science , Shanghai 200050 , P. R. China.

ACS Applied Materials & Interfaces
|April 28, 2018
PubMed
Summary

A new water-based method simplifies the large-scale production of lithium-garnet solid electrolytes for safer lithium-ion batteries. This process yields high-density ceramics with excellent ionic conductivity, enabling efficient battery performance.

Keywords:
LLZOLi-garnetLi−sulfur batteryattrition millsolid electrolytespray dry

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-state ionics

Background:

  • Lithium-garnet Li7La3Zr2O12 (LLZO) is a key solid electrolyte for solid-state lithium-ion batteries due to its high safety.
  • The high reactivity of LLZO with water complicates its large-scale synthesis.
  • Developing water-based processing methods is crucial for industrial production of LLZO.

Purpose of the Study:

  • To propose and validate a water-based solvent method for large-scale preparation of lithium-garnet ceramics.
  • To investigate the influence of processing parameters on the properties of the synthesized materials.
  • To demonstrate the performance of fabricated solid-state batteries using the developed ceramics.

Main Methods:

  • Synthesis of Ta-doped LLZO (Li6.4La3Zr1.4Ta0.6O12, LLZTO) and LLZTO/MgO composite ceramics.
  • Utilized attrition milling and spray-drying techniques with water-based slurries.
  • Characterized green and sintered pellets to study structural and property variations.

Main Results:

  • Achieved high relative density (∼95%) and uniform grain size in LLZTO/MgO composite ceramics.
  • Obtained a Li-ion conductivity of approximately 3.5 × 10-4 S/cm.
  • Fabricated Li-sulfur batteries demonstrated stable cycling for 20 cycles at 25 °C with 100% Coulombic efficiency.

Conclusions:

  • The developed water-based attrition milling and spray-drying method is a viable approach for mass production of Li-garnet ceramics.
  • The synthesized LLZTO/MgO composite ceramics exhibit promising properties for solid-state battery applications.
  • This research offers a scalable and practical solution for manufacturing advanced solid electrolytes.