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A Unique Gradiently-Distorted O3-type Configuration for High-Performance Li-Rich Layered Oxides by

Zhengwei Fan1,2, Dongdong Mao1,2, Luting Song1

  • 1Nanofabrication Laboratory, National Center for Nanoscience and Technology, Beijing, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 23, 2026
PubMed
Summary

This study introduces a novel electrochemical doping and annealing method to create unique structures in lithium-rich layered oxides. This approach enhances oxygen anionic redox chemistry, improving battery performance.

Keywords:
Li‐rich layered oxidesNa+ dopinganionic redox chemistryelectrochemically driven ion‐exchange doping annealingradiantly distorted O3‐type configuration

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Developing novel structures is crucial for advancing oxygen anionic redox chemistry in lithium-rich layered oxides (LLOs).
  • Conventional methods struggle to achieve these desired configurations in LLOs.
  • Electrochemical approaches offer a promising alternative for material structure engineering.

Purpose of the Study:

  • To develop a new strategy for creating novel configurations in LLOs.
  • To enhance oxygen anionic redox chemistry and improve battery performance.
  • To investigate the impact of electrochemically driven ion exchange and annealing on LLO structure.

Main Methods:

  • Electrochemically driven ion (Li and Na)-exchange doping (EDIED) followed by annealing (EDIEDA).
  • Characterization of the resulting O3-type and spinel structures with gradient Na+ distribution.
  • Analysis of transition metal migration and oxygen anionic redox reversibility.

Main Results:

  • The EDIEDA process created a distorted Na+-doped O3-type structure and a surface spinel phase.
  • A gradient distribution of Na+ was observed within the material.
  • The modified structure effectively suppressed transition metal migration, enhancing oxygen redox reversibility.
  • Achieved capacities of 303 mAh g-1 at 0.1C and 240 mAh g-1 at 1C within 2.0-4.6 V.

Conclusions:

  • The EDIEDA strategy successfully generates new configurations in LLOs.
  • This method significantly improves oxygen anionic redox reversibility and electrochemical performance.
  • The approach is potentially applicable to other layered oxide materials for performance enhancement.