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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

91
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
91

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Related Experiment Video

Updated: Apr 10, 2026

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
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In Situ Atomic Arrangement and Defect Engineering of Li-Rich Cathodes for Interface Stabilization.

Yueying Liu1, Mengke Zhang1, Shuli Zheng1

  • 1School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China.

ACS Applied Materials & Interfaces
|April 9, 2026
PubMed
Summary

Researchers developed a new method using La3+/W6+ codoping to stabilize high-energy Li-rich manganese layered (LMR) cathodes. This strategy enhances structural integrity and electrochemical stability, improving capacity retention for next-generation batteries.

Keywords:
Li-rich cathodescycling stabilityinterface-disordered phaseoxygen vacanciesvoltage decay

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-energy-density Li-rich manganese layered (LMR) cathodes promise advanced batteries but suffer from structural instability and capacity decay.
  • A key challenge is preventing the layer-to-rock salt transformation, especially in high-nickel compositions.

Purpose of the Study:

  • To develop an atomic-level design principle for stabilizing LMR cathodes.
  • To suppress detrimental phase transitions and enhance electrochemical performance.

Main Methods:

  • In situ atomic-level regulation via La3+/W6+ codoping.
  • Inducing an interface-disordered phase while maintaining the layered framework.
  • Controlled oxygen-vacancy generation and cation rearrangement at the near-surface region.

Main Results:

  • The codoping strategy effectively suppressed phase transitions and enhanced Li+ transport kinetics.
  • Robust La-O and W-O bonds improved interfacial oxygen framework and thermal stability.
  • The modified cathode (LW-3) showed significantly improved capacity retention (80.25%) compared to the original LMR (66.26%).

Conclusions:

  • La3+/W6+ codoping provides an effective strategy to stabilize LMR cathodes against layer-to-rock salt transformation.
  • This approach enhances structural integrity, mechanical resilience, and electrochemical durability.
  • The findings offer a pathway toward high-energy, long-life Li-rich layered oxides for next-generation energy storage.