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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
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Updated: May 27, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

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Cyclopropylamine Magnesium Borohydrides as Solid-State Electrolytes.

Mads B Amdisen1, Young-Su Lee2, Torben R Jensen1

  • 1Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark.

Inorganic Chemistry
|February 18, 2025
PubMed
Summary
This summary is machine-generated.

New solid-state electrolytes using cyclopropylamine magnesium borohydride compounds show promise for advanced batteries. The composite Mg(BH4)2·(CH2)2CHNH2-Al2O3 demonstrated significant ionic conductivity at room temperature.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-state Chemistry

Background:

  • Solid-state batteries offer higher energy and power densities than conventional lithium-ion batteries.
  • Solid electrolytes are key to enabling these advanced battery technologies.

Purpose of the Study:

  • To investigate cyclopropylamine magnesium borohydride compounds as potential solid-state electrolytes.
  • To evaluate the ionic conductivity and structural properties of these novel materials and their nanocomposites.

Main Methods:

  • Synthesis and characterization of three cyclopropylamine magnesium borohydride compounds.
  • Preparation and analysis of two nanocomposites with Al2O3.
  • Determination of crystal structures and ionic conductivities.

Main Results:

  • Four crystal structures were determined for the magnesium borohydride compounds.
  • The composite Mg(BH4)2·(CH2)2CHNH2-Al2O3 exhibited the highest ionic conductivity (1.8 × 10^-5 S cm^-1) at room temperature.
  • An exceptionally high ionic transference number (Tion = 0.99999) was achieved.

Conclusions:

  • Cyclopropylamine magnesium borohydride compounds are promising candidates for solid-state electrolytes.
  • Nanocomposite formation enhances ionic conductivity, paving the way for improved solid-state battery performance.
  • The addition of neutral ligands to metal borohydrides positively impacts ionic conductivity.