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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
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Additive-Regulated Interface Chemistry Enables Depolarization for Ultra-High Capacity LiCoO2.

Guorui Zheng1,2, Hengyu Ren1, Jimin Qiu1

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

Advanced Materials (Deerfield Beach, Fla.)
|August 21, 2025
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Summary
This summary is machine-generated.

A new organosiloxane additive, V4D4, enhances lithium-ion battery performance by stabilizing the cathode-electrolyte interface. This improves capacity and cycling stability for lithium cobalt oxide (LCO) cathodes at high voltages.

Keywords:
LiCoO2cathode‐electrolyte interphasecyclotetrasiloxanesdepolarizationinterface chemistry

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • High-energy-density lithium-ion batteries require stable cycling of LiCoO2 (LCO) cathodes at high voltages.
  • Interfacial degradation and polarization limit LCO performance at elevated cut-off voltages.

Purpose of the Study:

  • To investigate the depolarization effects of cyclic organosiloxane additive V4D4 on LCO cathode performance.
  • To enhance the interfacial charge transfer and stability of LCO||Li cells at high operating voltages.

Main Methods:

  • Addition of V4D4 to the electrolyte of LCO||Li cells.
  • Electrochemical cycling at a high upper cut-off voltage of 4.55 V.
  • Analysis of the cathode-electrolyte interphase (CEI) formation and composition.

Main Results:

  • V4D4 addition enhanced LCO capacity to 220 mA h g-1 at 4.55 V.
  • V4D4 stabilized the LCO surface by preventing HF/H2O formation and stabilizing lattice oxygen.
  • A stable, ultrathin CEI composed of silicon compounds and LiF was formed, reducing interfacial resistance.
  • Capacity retention of ~97% after 200 cycles was achieved with V4D4 and FEC.

Conclusions:

  • V4D4 effectively mitigates polarization and enhances the electrochemical performance of LCO cathodes at high voltages.
  • The formation of a robust CEI by V4D4 is crucial for long-term cycling stability and high energy density.
  • V4D4 represents a promising strategy for developing advanced high-voltage lithium-ion batteries.