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Ultrathin Titanium Dioxide Coating Enables High-Rate and Long-Life Lithium Cobalt Oxide.
1Institute of Materials for Energy and Environment, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
Materials (Basel, Switzerland)
|June 27, 2024
Summary
An ultra-thin titanium dioxide (TiO2) coating enhances lithium cobalt oxide (LCO) battery performance. This surface modification improves high-rate capability and long-term stability for advanced lithium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Lithium cobalt oxide (LCO) is a key cathode material for lithium-ion batteries.
- High-voltage LCO (HV-LCO) suffers from poor stability due to unstable cathode electrolyte interphase (CEI) and phase transitions.
- Fast Li+ diffusion is crucial for high-rate battery performance.
Purpose of the Study:
- To improve the high-rate and long-cycling stability of HV-LCO cathodes.
- To engineer an ultra-thin amorphous titanium dioxide (TiO2) coating on LCO using atomic layer deposition (ALD).
- To investigate the mechanism behind the enhanced performance.
Main Methods:
- Atomic Layer Deposition (ALD) to coat LCO with TiO2.
- Electrochemical testing (cycling stability, rate capability).
- In situ X-ray Diffraction (XRD) and ex situ X-ray Photoelectron Spectroscopy (XPS) for material analysis.
Main Results:
- The TiO2 coating significantly improved Li+ storage properties.
- The average Li+ diffusion coefficient nearly tripled.
- High-rate capability of 125 mAh g-1 at 5C was achieved.
- Improved cycling stability with 86.7% capacity retention after 300 cycles at 1C (vs. 37.9% for bare LCO).
Conclusions:
- The uniform TiO2 coating creates a dense and stable CEI, buffering Li+ flux and preventing electrolyte degradation.
- Surface protection by TiO2 enhances the cycling stability of HV-LCO electrodes.
- This work facilitates the development of long-life HV-LCO batteries through transition metal oxide surface modification.
