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Facilitating Reversible Cation Migration and Suppressing O2 Escape for High Performance Li-Rich Oxide Cathodes
Ke Chai1,2, Jicheng Zhang1, Qingyuan Li1
1Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|April 4, 2022
Summary
Introducing oxygen vacancies and phosphorus doping into lithium-rich manganese-based oxide cathodes enhances Li-ion battery performance by improving cation migration and suppressing oxygen gas release.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- High-capacity lithium-rich manganese-based oxide cathodes are crucial for next-generation lithium-ion batteries.
- These materials face challenges including oxygen escape, irreversible cation migration, and voltage decay.
Purpose of the Study:
- To mitigate critical issues in Li-rich cathodes by structural modulation.
- To reveal the mechanism of improvement through simultaneous oxygen vacancy and P doping.
Main Methods:
- Comprehensive structural modulation of Li-rich cathodes in bulk and surface.
- Simultaneous introduction of oxygen vacancies and phosphorus doping.
- Analysis of oxygen redox regulation and cation migration.
Main Results:
- Oxygen vacancies and P doping enhance reversible cation migration by elongating O-O distance.
- Reversible cation migration elevates discharge voltage, inhibits voltage decay, and prevents oxygen escape.
- Surface lattice transformation to a spinel phase by oxygen vacancies deactivates oxygen redox and restrains O2 escape.
- P doping increases bulk lattice stability through enhanced cation-anion covalency.
Conclusions:
- The modulated Li-rich cathode demonstrates high-rate capability, good cycling stability, and restrained voltage decay.
- Facilitating reversible cation migration and suppressing oxygen escape are key to regulating oxygen redox.
- This study provides insights for designing advanced Li-rich cathode materials.
