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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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. 
54.1K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

27.3K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
27.3K
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...
26.8K
Valence Bond Theory02:42

Valence Bond Theory

11.7K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.7K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

49.7K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
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Fast lithium-ionic conduction in a new complex hydride-sulphide crystalline phase.

Atsushi Unemoto1, Hui Wu, Terrence J Udovic

  • 1WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan. unemoto@imr.tohoku.ac.jp.

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This summary is machine-generated.

A novel solid electrolyte material exhibits high ionic conductivity and stability for all-solid-state batteries. This advancement enables repeated battery cycling at room temperature.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-state Chemistry

Background:

  • All-solid-state batteries (ASSBs) offer enhanced safety and energy density compared to conventional lithium-ion batteries.
  • Development of solid electrolytes with high ionic conductivity, wide electrochemical stability, and good mechanical properties is crucial for practical ASSB applications.
  • Existing solid electrolytes often face challenges related to conductivity, stability, or processability.

Purpose of the Study:

  • To synthesize and characterize a new crystalline solid electrolyte material.
  • To evaluate the electrochemical performance and stability of the new electrolyte.
  • To demonstrate the feasibility of using this electrolyte in a functional all-solid-state battery.

Main Methods:

  • Synthesis of a new crystalline phase from a 90LiBH4:10P2S5 mixture.
  • Measurement of ionic conductivity at various temperatures.
  • Assessment of thermal stability and electrochemical potential window.
  • Fabrication and testing of a bulk-type all-solid-state TiS2/InLi battery.

Main Results:

  • A new crystalline phase was successfully derived from the 90LiBH4:10P2S5 mixture.
  • The material exhibits high lithium-ionic conductivity (log(σ/S cm(-1)) = -3.0 at 300 K).
  • The electrolyte demonstrates stability up to 473 K, a wide potential window (0-5 V), and favorable mechanical properties.
  • The TiS2/InLi ASSB incorporating this electrolyte showed repeated battery operation at 300 K.

Conclusions:

  • The newly developed crystalline phase is a promising solid electrolyte material for all-solid-state batteries.
  • Its high ionic conductivity, thermal stability, and electrochemical window make it suitable for practical battery applications.
  • The successful demonstration in a TiS2/InLi battery highlights its potential for enabling safe and efficient energy storage solutions.