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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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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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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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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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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Ionic Association01:28

Ionic Association

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Out-Of-Plane Symmetry Design Arrests Structural Evolution in Layered-Type Framework for Sustainable Sodium Shuttling.

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Engineered monoclinic distortion in sodium transition metal oxides stabilizes sodium-ion batteries by preventing structural changes during cycling. This breakthrough enhances battery longevity and performance, addressing key challenges in energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sodium-ion batteries (SIBs) are a sustainable alternative to lithium-ion batteries, crucial for the energy transition and addressing lithium scarcity.
  • Structural instability in sodium transition metal oxides (NaxTMyO2) during de/sodiation, caused by crystallographic diversity and symmetry reconfigurations, hinders stable SIB operation.

Purpose of the Study:

  • To investigate the role of out-of-plane symmetry in stabilizing NaxTMyO2 structures during SIB cycling.
  • To develop a strategy for mitigating structural evolution and phase instability in P3-type SIB cathodes.

Main Methods:

  • Engineered a monoclinic distortion in NaxTMyO2 materials to create a unique out-of-plane symmetry.
  • Investigated the resulting interstitial sites for sodium ions and their impact on structural stability during deep desodiation.
  • Evaluated the electrochemical performance, including cycling stability and voltage hysteresis, of the engineered materials.

Main Results:

  • The engineered out-of-plane symmetry enabled the coexistence of P- and O-type interstitial sites, preventing interlayer oxygen ion slipping.
  • Structural integrity was maintained even at low sodium content (<0.2 Na+ per formula), overcoming phase instability in P3-type cathodes.
  • Achieved stable cycling with significantly reduced voltage hysteresis (0.16 V over 100 cycles) and high energy density (437.1 Wh kg-1).

Conclusions:

  • Out-of-plane symmetry engineering is a critical strategy for stabilizing sodium transition metal oxides in SIBs.
  • This approach effectively prevents irreversible structural evolution and cumulative voltage hysteresis, paving the way for high-performance SIBs.
  • The developed method offers a promising solution for advancing sustainable energy storage technologies.