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Anionic Redox in Rechargeable Lithium Batteries.

Biao Li1, Dingguo Xia1

  • 1Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials, College of Engineering, Peking University, Beijing, 100871, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|June 30, 2017
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Summary
This summary is machine-generated.

Lithium-rich oxide cathodes achieve high capacities through both cationic and anionic redox. Understanding and controlling anionic redox is key for developing advanced, high-performance battery electrodes.

Keywords:
anionic redoxcathodeslithium-ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium-rich oxide cathodes offer exceptionally high capacities compared to conventional layered oxides.
  • These enhanced capacities stem from synergistic contributions of both cationic and anionic redox processes.
  • Anionic redox, though proposed earlier, is now recognized as critical for next-generation high-capacity electrodes.

Purpose of the Study:

  • To provide an overview of anionic redox in lithium-rich oxides.
  • To discuss challenges and principles governing anionic redox, including activation, reversibility, and energy barriers.
  • To review characterization techniques for anionic redox processes.

Main Methods:

  • Literature review of anionic redox phenomena in lithium-rich oxides.
  • Analysis of electronic and geometric structure effects on anionic redox.
  • Discussion of techniques for characterizing anionic redox.

Main Results:

  • Anionic redox is crucial for high-capacity electrodes but can cause capacity loss, degradation, and voltage hysteresis.
  • Understanding the electronic and geometric factors is essential for controlling anionic redox.
  • A review of characterization methods is presented to guide future research.

Conclusions:

  • Controlling anionic redox reactions is vital for mitigating detrimental effects like capacity fade and structural instability.
  • Future research should focus on rationally designing materials and employing appropriate characterization techniques.
  • This work provides perspectives to guide future investigations into anionic redox processes for improved battery performance.