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Advanced TiO2/Al2O3 Bilayer ALD Coatings for Improved Lithium-Rich Layered Oxide Electrodes
Wei-Ming Chen1,2,3, Hsin-Yu Hsieh1, Dong-Ze Wu1,4
1Institute of Physics, Academia Sinica, 128, Section 2, Academia Road, Taipei 11529, Taiwan.
ACS Applied Materials & Interfaces
|February 29, 2024
Summary
Atomic layer deposition created a TiO2/Al2O3 bilayer coating on lithium-rich layered oxide cathodes. This surface modification significantly enhances battery performance and stability for advanced lithium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-rich layered oxide (LLO) cathodes suffer from phase transformation, cracking, oxygen release, and transition-metal ion dissolution, limiting their application in lithium-ion batteries.
- Existing surface modification strategies, such as single/double-layer coatings, often present challenges like poor component contact and complexity.
Purpose of the Study:
- To develop a low-temperature atomic layer deposition (ALD) process for creating a TiO2/Al2O3 bilayer coating on AS200 LLO composite cathodes.
- To investigate the impact of this bilayer coating on the electrochemical performance and stability of LLO cathodes.
Main Methods:
- Utilized a low-temperature atomic layer deposition (ALD) technique to apply a TiO2/Al2O3 bilayer coating onto AS200 (Li1.08Ni0.34Co0.08Mn0.5O2) composite cathodes.
- Conducted comprehensive electrochemical analyses, including cycling performance, capacity retention, and impedance spectroscopy, to evaluate the coated electrodes against uncoated counterparts.
Main Results:
- The TiO2/Al2O3-coated LLO electrodes demonstrated superior discharge capacities and significantly improved capacity retention compared to uncoated electrodes.
- The TAA-5/AS200 bilayer-coated electrode achieved remarkable capacity retention of approximately 90.4% and a specific discharge capacity of 146 mAh g-1 after 100 cycles at 1C.
- Coated electrodes exhibited reduced voltage decay, lower surface film resistance, and enhanced interfacial charge transfer resistance, indicating improved stability.
Conclusions:
- The ALD-deposited TiO2/Al2O3 bilayer coating effectively mitigates common issues in LLO cathodes, leading to enhanced electrochemical performance.
- This bilayer coating strategy offers a promising pathway for advancing the stability and cycle life of lithium-rich layered oxide cathodes for high-performance lithium-ion batteries.
