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Ionic Crystal Structures02:42

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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Related Experiment Video

Updated: May 22, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Defect engineering constructs two-dimensional metal sulfoselenide with expanded interlayers for fast and efficient

Yun-Lei Hou1, Wenliang Sun1, Ming-Xin Cui1

  • 1College of Chemical Engineering, Qinghai University, Xining 810016, China.

Journal of Colloid and Interface Science
|March 15, 2025
PubMed
Summary

This study introduces a novel anode material for sodium-ion batteries (SIBs) using selenium-substituted tin disulfide coated with nitrogen-doped carbon. This enhanced anode offers superior performance and durability for large-scale energy storage applications.

Keywords:
Anode materialDFT calculationDefect engineeringMetal sulfoselenideSodium ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sodium-ion batteries (SIBs) are a promising alternative to lithium-ion batteries for large-scale energy storage due to abundant sodium reserves and lower costs.
  • Anode materials are critical for SIB performance, with nanostructure and surface modification being key areas of research.
  • Defect engineering in metal sulfides, including anionic species incorporation, is an emerging strategy to enhance sodium storage.

Purpose of the Study:

  • To develop a high-performance anode material for SIBs by incorporating anionic species and defect engineering.
  • To investigate the impact of selenium substitution and carbon coating on the electrochemical properties of tin disulfide anodes.
  • To provide a novel pathway for designing advanced metal sulfide anode materials for SIBs.

Main Methods:

  • Synthesis of a nitrogen-doped carbon-coated two-dimensional metal sulfide with partial selenium substitution (SnS0.6Se1.4@NC).
  • Characterization of the material's structure, including expanded interlayer distance and lattice defects.
  • Electrochemical testing of the synthesized material as an anode in SIBs to evaluate cyclic performance and rate capability.

Main Results:

  • Selenium substitution effectively expanded the interlayer distance of SnS2, facilitating Na+ intercalation/deintercalation.
  • Lattice defects acted as nucleation sites for conversion-alloying products, enhancing stability and dispersibility.
  • The SnS0.6Se1.4@NC anode demonstrated superior cyclic performance (506.6 mA h g-1 at 0.1 A g-1 after 200 cycles) and rate capability (312.4 mA h g-1 at 1 A g-1 after 500 cycles).

Conclusions:

  • The developed SnS0.6Se1.4@NC anode material exhibits excellent electrochemical performance for SIBs.
  • The strategy of anionic substitution and defect engineering in metal sulfides is effective for designing high-performance anode materials.
  • This work offers a promising approach for advancing SIB technology for large-scale energy storage.