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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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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.
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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.
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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:
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Stabilizing Interlayer Repulsion in Layered Sodium-Ion Oxide Cathodes via Hierarchical Layer Modification.

Xiangsi Liu1,2,3, Chen Yuan1,2,3, Xingyu Zheng1,2,3

  • 1Research Center for Industries of the Future, Westlake University, Hangzhou, Zhejiang, 310030, China.

Advanced Materials (Deerfield Beach, Fla.)
|August 1, 2024
PubMed
Summary

Hierarchical layer modification stabilizes layered sodium-ion oxide cathodes by mitigating O2-─O2- repulsion. This strategy enhances structural integrity and electrochemical performance for advanced sodium-ion batteries.

Keywords:
electrostatic repulsionshierarchical layer modificationslayered oxide cathodesphase transformationssodium‐ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Layered sodium-ion oxides are promising for high-performance sodium-ion batteries.
  • Phase transformation during charging, caused by O2-─O2- repulsion, leads to performance decay.
  • Stabilizing interlayer repulsion is crucial for improving battery longevity.

Purpose of the Study:

  • To develop a hierarchical layer modification strategy for stabilizing layered sodium-ion oxide cathodes.
  • To mitigate O2-─O2- repulsion during sodium extraction.
  • To enhance the structural stability and electrochemical performance of sodium-ion battery cathodes.

Main Methods:

  • Proposed a hierarchical layer modification strategy involving Li+ migration and Ca2+ anchoring.
  • Incorporated partial oxygen substitution with fluorine.
  • Investigated the interplay between doping elements (Li, Ca, F) and their effect on structural stability.

Main Results:

  • The modified cathode (Na0.61Ca0.05[Li0.1Ni0.23Mn0.67]O1.95F0.05, NCLNMOF) retained a pure P2-type structure across a wide voltage range.
  • Achieved 82.5% capacity retention after 1000 cycles.
  • Demonstrated a high-rate capability of 94 mAh g-1 at 1600 mA g-1.

Conclusions:

  • Hierarchical layer modification effectively suppresses O2-─O2- repulsion, enhancing structural stability.
  • The NCLNMOF cathode shows excellent cycling stability and rate capability.
  • This strategy offers a promising route for developing high-performance layered oxide cathodes for sodium-ion batteries.