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Invoking Interfacial Engineering Boosts Structural Stability Empowering Exceptional Cyclability of Ni-Rich Cathode
Youqi Chu1,2, Yongbiao Mu1,2, Huicun Gu1,2
1Shenzhen Key Laboratory of Advanced Energy Storage, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Advanced Materials (Deerfield Beach, Fla.)
|June 10, 2024
Summary
This study enhances lithium-ion battery cathodes with Se-doped and FeSe2/Fe2O3 modification, improving high-voltage stability and preventing structural collapse for longer battery life.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- High-voltage operation of LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes is limited by hybrid anion/cation redox.
- This leads to oxygen release and structural degradation, hindering cycling stability.
Purpose of the Study:
- To develop a stable Ni-rich cathode for high-voltage lithium-ion batteries.
- To improve the cycling performance and safety of NCM811 through interfacial engineering.
Main Methods:
- Interfacial engineering using mechanical ball milling and low-temperature calcination.
- Modification of NCM811 with Se-doping and FeSe2/Fe2O3 nanoparticles.
- Investigating the formation of O-TM-Se bonds and self-assembled electric fields.
Main Results:
- Se doping stabilizes lattice oxygen and prevents structural distortion.
- FeSe2/Fe2O3 coating enhances interfacial charge transfer and Li+ diffusion.
- Modified NCM811 shows 79.7% capacity retention after 500 cycles at 4.5V and 94.6% in full cells.
Conclusions:
- The dual-modification strategy effectively suppresses oxygen escape and structural collapse.
- This approach significantly enhances the electrochemical performance of high-voltage NCM811 cathodes.
- Opens new avenues for developing stable, high-voltage lithium-ion batteries.
