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Related Concept Videos

Ion Exchange01:17

Ion Exchange

1.4K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.4K
Ionic Bonds00:42

Ionic Bonds

133.8K
Overview
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.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
133.8K
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

2.0K
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
2.0K
Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

89.2K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
89.2K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

51.9K
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. 
51.9K
Ionic Association01:28

Ionic Association

19
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.
19

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Updated: Mar 5, 2026

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

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Polyanion-Type Electrode Materials for Sodium-Ion Batteries.

Qiao Ni1, Ying Bai1, Feng Wu2

  • 1Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science & Engineering Beijing Institute of Technology Beijing 100081 P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 24, 2017
PubMed
Summary

Sodium-ion batteries offer a cost-effective, abundant alternative for energy storage. Polyanion materials show promise, but low conductivity and capacity hinder widespread adoption of these advanced sodium-ion batteries.

Keywords:
electrode materialsenergy conversionenergy storagepolyanionssodium‐ion batteries

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sodium-ion (Na-ion) batteries are emerging as a viable alternative to lithium-ion batteries for large-scale energy storage.
  • The development of Na-ion batteries is driven by the need for abundant, cost-effective, and durable electrode materials.
  • Polyanion-type compounds are highly regarded for Na-ion battery electrodes due to their inherent stability, safety, and appropriate operating voltages.

Purpose of the Study:

  • To review the research progress of polyanion-type electrode materials for sodium-ion batteries.
  • To summarize recent advancements and highlight emerging strategies in this field.
  • To discuss the persistent challenges limiting the development of these materials.

Main Methods:

  • Literature review of polyanion-type electrode materials for Na-ion batteries.
  • Analysis of representative materials such as Na3V2(PO4)3 and NaTi2(PO4)3.
  • Examination of newer materials like carbonophosphate Na3MnCO3PO4 and amorphous FePO4.

Main Results:

  • Na3V2(PO4)3 and NaTi2(PO4)3 demonstrate superior electrochemical properties for cathode and anode applications, respectively.
  • Emerging materials like Na3MnCO3PO4 and amorphous FePO4 are expanding the research landscape.
  • Key challenges include low electrical conductivity and suboptimal capacity performance in many polyanion-type materials.

Conclusions:

  • Polyanion-type materials are crucial for advancing sodium-ion battery technology.
  • Overcoming conductivity and capacity limitations is essential for practical applications.
  • Continued research into novel polyanion structures and modification strategies is vital for future development.