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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. 
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Stabilizing Lattice Oxygen via Interfacial B-O Complexing for a 4.6 V LiCoO2 Cathode.

Jimin Qiu1, Yuchen Ji1, Wenfang Li2

  • 1School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China.

ACS Nano
|September 16, 2025
PubMed
Summary

High-voltage lithium cobalt oxide cathodes are stabilized using a B-O complexing strategy. This method prevents oxygen loss and cobalt dissolution, enhancing battery performance and stability.

Keywords:
Li-ion batterieselectrolyte modificationhigh-voltage LiCoO2interfacial B−O complexingsurface lattice oxygen

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Lithium cobalt oxide (LiCoO2) cathodes exhibit structural instability at high voltages (>4.5 V).
  • This instability involves phase transitions, cobalt dissolution, and interfacial reactions, linked to unstable surface lattice oxygen.

Purpose of the Study:

  • To stabilize the surface lattice oxygen of LiCoO2 at 4.6 V.
  • To mitigate structural degradation and improve the electrochemical performance of high-voltage LiCoO2 cathodes.

Main Methods:

  • An interfacial B-O complexing strategy using tris(pentafluorophenyl)borane electrolyte additive.
  • In situ and ex situ characterization techniques with temporal and spatial resolution.

Main Results:

  • The B-O complexing strategy effectively stabilized surface lattice oxygen by inhibiting peroxy-like species (O2^2-).
  • Oxygen loss and interfacial side reactions were significantly retarded, preserving cobalt's chemical environment.
  • Phase transitions and coordination structure changes were suppressed, improving capacity retention and rate performance.

Conclusions:

  • The interfacial B-O complexing strategy successfully stabilizes high-voltage LiCoO2 cathodes.
  • This approach offers a pathway to enhance the durability and efficiency of advanced lithium-ion batteries.