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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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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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Aqueous Solutions and Heats of Hydration02:42

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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Colloidal precipitates

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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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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Suspended Lithium Nitrate-Based Electrolytes: Electrostatic Interactions for Mutually Rewarding Interface

Wenjing Zhang1,2,3,4, Zhenguo Zhang1,2,4, Hongtao Zhang1,2,4

  • 1Hebei Engineering Research Center of Advanced Energy Storage Technology and Equipment, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 20, 2025
PubMed
Summary
This summary is machine-generated.

A novel suspension electrolyte strategy uniformly disperses lithium nitrate particles, enhancing lithium metal battery stability and performance across wide temperatures. This approach stabilizes the electrode-electrolyte interface, improving safety and energy density.

Keywords:
interface optimizationlithium metal batteriessuspension electrolytewide temperature range

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Stable electrode-electrolyte interfaces (EEI) are crucial for high-energy lithium metal batteries.
  • Lithium nitrate (LiNO3) is a promising sacrificial additive but suffers from poor solubility in ester/nitrile electrolytes.
  • Limited utility of LiNO3 hinders the development of safe and high-performance lithium metal batteries.

Purpose of the Study:

  • To develop a novel suspension electrolyte strategy for dispersing LiNO3 particles.
  • To stabilize the electrode-electrolyte interface in lithium metal batteries.
  • To enhance battery performance, safety, and applicability across a wide temperature range.

Main Methods:

  • A suspension electrolyte strategy was proposed, dispersing LiNO3 particles in an ester/nitrile mixed electrolyte.
  • The dual functionality of suspended LiNO3 particles was investigated for interface stabilization and Li+ transport.
  • Electrochemical performance of Li||NCM523 batteries was evaluated at various temperatures (60°C and -10°C) and high voltage (4.5 V).

Main Results:

  • The suspension electrolyte uniformly dispersed LiNO3, enhancing electrode-electrolyte compatibility and Li+ solvation.
  • In situ formed LiNxOy-rich EEI accelerated Li+ transport kinetics, suppressed parasitic reactions, and improved rate performance.
  • The optimized electrolyte enabled stable cycling for 100 cycles with 90.05% capacity retention at 60°C and stable low-temperature operation at -10°C.

Conclusions:

  • The suspension electrolyte strategy effectively overcomes LiNO3 solubility limitations in ester/nitrile electrolytes.
  • This dual-strategy approach, combining wide-temperature formulation and interface engineering, significantly enhances lithium metal battery performance.
  • The developed technology offers a pathway towards high-specific-energy, safe, and broadly applicable lithium metal batteries.