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High Performance 4.6 V LiCoO2 Cathode Materials Enabled by Surface Lattice Modulation.

Qi-Wen Liu1,2, Si-Jie Guo1, Xin-Cheng Lei3

  • 1CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences (ICCAS), Beijing, P. R. China.

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|December 26, 2025
PubMed
Summary
This summary is machine-generated.

High-voltage lithium cobalt oxide (LCO) cathodes achieve greater capacity using a novel decomposition-induced reconstruction process. This method enhances surface stability, enabling high energy density in lithium-ion batteries.

Keywords:
LiCoO2Li‐ion batterieshigh‐voltage cathode materialsurface lattice modulation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Increasing lithium cobalt oxide (LCO) cathode voltage to 4.6 V boosts reversible capacity.
  • Higher voltages introduce significant stability challenges for LCO cathodes.

Purpose of the Study:

  • To enhance the stability of high-voltage LCO cathodes while maintaining high capacity.
  • To develop a precise surface modification technique for LCO.

Main Methods:

  • Decomposition-induced reconstruction (DIR) process.
  • Coating LCO with a conformal Y(OH)CO3 nanoshell.
  • Controlled sintering to induce hydrocarbonate decomposition and surface lattice transformation.

Main Results:

  • The DIR process created a stable, rock-salt-like surface structure on the LCO cathode.
  • The modified LCO cathode achieved a capacity of 215.8 mAh g⁻¹ at 0.1 C with 93.0% retention after 100 cycles at 4.6 V.
  • Demonstrated superior long-term cycling stability (85.5% vs. 13.6% after 500 cycles at 1 C) and performance under harsh conditions.

Conclusions:

  • Surface chemistry engineering is crucial for overcoming stability issues in high-voltage LCO cathodes.
  • The DIR method offers precise control for developing robust, high-energy-density lithium-ion battery cathodes.
  • This approach provides valuable insights for future battery material development.