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Related Concept Videos

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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Ionic Strength: Effects on Chemical Equilibria01:19

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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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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Tailoring Electrolyte Solvation for LiF-Rich Solid Electrolyte Interphase toward a Stable Li Anode.

Haifeng Tu1,2, Linge Li3, Zhicheng Wang3

  • 1Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China.

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|September 28, 2022
PubMed
Summary

A novel electrolyte additive creates a robust solid electrolyte interphase (SEI) for lithium metal batteries. This advanced SEI effectively suppresses dendrite growth, enhancing battery performance and longevity.

Keywords:
crowding dilutantionic liquid electrolyteslithium metal batterysolid electrolyte interphasesolvation structure

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • High-performance lithium metal batteries require a solid electrolyte interphase (SEI) with mechanical strength and ionic conductivity to prevent lithium dendrite growth.
  • Directly forming such an ideal SEI from conventional electrolytes remains a significant challenge in battery research.

Purpose of the Study:

  • To develop a modified ionic liquid electrolyte (M-ILE) using a crowding diluent for constructing a superior SEI.
  • To investigate the mechanism by which the diluent promotes SEI formation and enhances battery performance.

Main Methods:

  • Utilized simulations and experimental validation to study the M-ILE.
  • Incorporated 1,2-difluorobenzene (1,2-dfBen) as a crowding diluent in the ionic liquid electrolyte.
  • Fabricated and tested Li/LiFePO4 and Li/LiNi0.5Co0.2Mn0.3O2 battery cells using the M-ILE.

Main Results:

  • The 1,2-dfBen diluent induced a crowded electrolyte environment, promoting Li+-FSI- interactions and aggregate ion pair formation.
  • The diluent actively participated in the reduction process, forming a robust SEI with high ionic conductivity.
  • Li/LiFePO4 cells demonstrated 96% capacity retention over 250 cycles; Li/LiNi0.5Co0.2Mn0.3O2 cells retained 88% capacity after 100 cycles.

Conclusions:

  • The crowding diluent strategy is effective for creating advanced SEIs in lithium metal batteries.
  • This approach offers a promising pathway for improving the safety and cycle life of lithium metal batteries.
  • The developed M-ILE significantly enhances the performance of lithium metal anodes by optimizing SEI properties.