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Related Concept Videos

Theory of Strong Electrolytes01:23

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
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Solar-Driven Electrochemical Green Fuel Production from CO2 and Water Using Ti3C2Tx MXene-Supported CuZn and NiCo Catalysts
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Theory-guided cation engineering overcome V-based polyanion cathode kinetic performance limitation.

Han Su1, Yangbin Fu2, Zhibin Li1

  • 1Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072, China.

Journal of Colloid and Interface Science
|July 14, 2026
PubMed
Summary

Manganese (Mn2+) doping enhances sodium-ion battery performance by improving electrical conductivity in Na3V2(PO4)3 (NVP) cathodes. This modification optimizes charge distribution, boosting rate capability and long-term stability for advanced energy storage.

Keywords:
Crystal field theoryDFTElement screeningPolyanionic compoundSodium-ion batteries

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
10:03

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Published on: November 11, 2013

Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Sodium-ion batteries (SIBs) are promising for grid-scale energy storage.
  • NASICON-type cathodes, like Na3V2(PO4)3 (NVP), offer low cost and good ionic conductivity.
  • Poor electrical conductivity in NVP due to electron localization in VO octahedra limits kinetic performance.

Purpose of the Study:

  • To enhance the electrical conductivity and kinetic performance of NVP cathodes.
  • To investigate the effects of Mn2+ doping on the electronic structure and charge distribution of NVP.
  • To provide a rational design strategy for high-performance NASICON cathodes.

Main Methods:

  • Crystal field theory and Density Functional Theory (DFT) for theoretical guidance.
  • Mn2+ ion doping to remodel charge distribution.
  • Ultraviolet photoelectron spectroscopy (UPS) to analyze electronic structure.
  • In-situ Electrochemical Impedance Spectroscopy with Distribution of Relaxation Times (EIS-DRT) for dynamic analysis.
  • Differential charge density and Bader charge population calculations for microscopic insights.

Main Results:

  • Mn2+ doping effectively raises the valence band maximum (VBM), reducing the bandgap and enhancing electron delocalization.
  • Lowered work function facilitates electron escape at interfaces.
  • Optimized NVP (NVMP-0.5) shows significantly reduced charge-transfer and ion-diffusion resistances.
  • Exceptional rate capability (102.9 mAh g-1 at 50C) and long-term stability (70.2% retention after 1000 cycles at 50C) were achieved.

Conclusions:

  • Mn2+ incorporation successfully addresses the intrinsic electrical conductivity bottleneck in NVP cathodes.
  • The study demonstrates a synergistic approach combining theoretical predictions and experimental validation for material design.
  • This work offers valuable insights for developing advanced NASICON cathodes for high-performance sodium-ion batteries.