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A Simple Gas-Solid Treatment for Surface Modification of Li-Rich Oxides Cathodes
Zhengcheng Ye1, Bin Zhang2, Ting Chen1
1Department of Chemical Engineering, University of Sichuan, Chengdu, 610065, P. R. China.
Angewandte Chemie (International Ed. in English)
|August 18, 2021
Summary
A novel gas-solid treatment enhances Li-rich layered oxide cathodes by forming a spinel layer. This improves stability and suppresses oxygen loss, boosting performance for next-generation batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Li-rich layered oxides are promising high-capacity cathode materials.
- Anionic redox reactions cause capacity fading and oxygen loss in these materials.
Purpose of the Study:
- To develop a method to stabilize Li-rich layered oxides.
- To improve the electrochemical performance and cycle life of these cathodes.
Main Methods:
- Gas-solid treatment using ferrous oxalate to coat the cathode surface.
- Formation of a spinel phase layer with oxygen vacancies.
- Surface doping with Fe-ions.
Main Results:
- The treated cathode (Feox-2%) showed improved capacity retention (86.4% at 1C, 85.5% at 2C) after 300 cycles compared to the pristine sample (75.3% at 1C, 75.0% at 2C).
- Voltage fading was significantly suppressed to 0.0011 V/cycle at 2C.
- The spinel layer with oxygen vacancies and Fe-ion doping stabilized the structure and suppressed oxygen release.
Conclusions:
- The gas-solid treatment effectively enhances the stability and electrochemical performance of Li-rich layered oxide cathodes.
- This method offers a promising pathway for the practical application of these advanced battery materials.
