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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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When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Delocalized Electron System Enables Stable NASICON Cathode for Sodium-Ion Batteries.

Jiandong Zhang1, Zhaoshi Yu1, Muqin Wang1

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Researchers developed a novel NASICON cathode material for sodium-ion batteries. This new material exhibits enhanced kinetics, stable cycling, and broad temperature operation, overcoming previous performance limitations.

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electron delocalizationfast kineticshigh ratesingle-phase reactionsodium-ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • NASICON-type Na3MnTi(PO4)3 shows promise as a sodium-ion battery cathode due to its high theoretical capacity.
  • Practical application is limited by poor kinetics and stepwise phase transitions in existing materials.

Purpose of the Study:

  • To synthesize a novel NASICON-type material with improved electrochemical kinetics and phase transition stability.
  • To overcome the performance trade-offs in sodium-ion battery cathode materials.

Main Methods:

  • A multi-d-electron synthesis approach was employed to create Na3.5V0.5Mn0.5Cr0.5Ti0.5(PO4)3.
  • Characterization of the material's electrochemical properties, including rate capability, cycling stability, and temperature performance.
  • Fabrication and testing of a pouch-type full cell to assess practical feasibility.

Main Results:

  • The novel material exhibits a delocalized electron system, enhancing electrochemical kinetics.
  • A stable single-phase reaction mechanism with minimal volume change (1.8%) was achieved.
  • High rate capability (98.9 mAh g-1 at 40 C), long-term cycling (88.3% after 10,000 cycles), and wide temperature operation (-40 to 50 °C) were demonstrated.
  • The full cell retained 85.2% capacity after 500 cycles.

Conclusions:

  • The developed NASICON cathode material effectively breaks the performance trade-off for sodium-ion batteries.
  • Delocalized electron systems and controlled phase transitions are key to high-performance NASICON cathodes.
  • This study offers insights into reaction dynamics for advanced energy storage solutions.