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High-Entropy Gradient-Like Design Enables 4.7 V High-Stability LiCoO2 for Lithium-Ion Battery.

Jiaming Miao1,2, Sheng Zhou2, Donghui Chen2

  • 1Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources, School of Rare Earth Industry, Ministry of Education, Inner Mongolia University of Science and Technology, Baotou, China.

Small (Weinheim an Der Bergstrasse, Germany)
|June 9, 2026
PubMed
Summary
This summary is machine-generated.

High-voltage lithium cobalt oxide (LCO) batteries achieve longer life using a novel high-entropy gradient design. This surface coating enhances stability and performance for advanced electronic devices.

Keywords:
gradient‐likehigh‐entropy coatinghigh‐stabilityhigh‐voltage LiCoO2lithium‐ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • High-voltage lithium cobalt oxide (LCO) is crucial for extending battery life in smart devices.
  • Current LCO materials face limitations due to interface instability and structural degradation above 4.7 V.

Purpose of the Study:

  • To develop a high-entropy gradient design for enhanced electrochemical stability in high-voltage LCO.
  • To investigate the structure-activity relationship and effects of surface modification on LCO performance.

Main Methods:

  • Fabrication of an ultra-thin high-entropy surface coating (1.35 nm) and subsurface doping (1 nm) using TiO2, Al2O3, MgO, In2O3, and La2O3.
  • Utilized in situ, ex situ characterizations and Density Functional Theory (DFT) calculations.
  • Electrochemical testing in half-cells and full LCO//graphite pouch-cells.

Main Results:

  • The high-entropy gradient design effectively suppresses side reactions and enhances Li+ diffusion kinetics.
  • Subsurface doping mitigates lattice distortion caused by phase transitions, improving stability above 4.7 V.
  • Achieved 197.24 mAh g-1 capacity with 92.4% retention over 400 cycles (3.0-4.7 V) in half-cells.
  • Demonstrated 210.42 mAh g-1 capacity with 95.5% retention over 100 cycles (3-4.6 V) in full pouch-cells.

Conclusions:

  • The high-entropy lattice design significantly enhances the electrochemical stability and cycle life of high-voltage LCO.
  • This approach offers a promising strategy for developing high-volumetric-energy-density and long-lasting LCO materials for advanced applications.