Related Experiment Video
Updated: Jul 9, 2026
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Prolong cycle-life by interlayer doping and vacancy coupling engineering in Li-rich oxide cathodes
Wang Ke1, Fu-Da Yu2, Yun-Shan Jiang1
1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, State Key Laboratory of Space Power-Sources, Harbin Institute of Technology, Harbin 150001, China.
Researchers developed interlayer transition metal (TM)-vacancy coupling defects to enhance Li-rich layered oxides (LLOs). This strategy significantly improves cycle-life and capacity retention in LLO cathodes for batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Li-rich layered oxides (LLOs) offer high capacity via oxygen anionic redox but suffer from rapid degradation.
- Degradation is linked to internal strain, oxygen redox instability, and structural damage, limiting cycle-life.
- Previous modifications focused on individual defect types, inspiring combined defect engineering.
Purpose of the Study:
- To investigate the effectiveness of constructing interlayer TM-vacancy coupling defects in LLOs.
- To enhance the structural stability and electrochemical performance of LLO cathodes.
- To achieve both high energy density and long cycle-life in LLO materials.
Main Methods:
- Fabrication of LLOs with engineered interlayer TM-vacancy coupling defects.
- Electrochemical testing, including cycling stability and voltage decay measurements.
- Structural analysis to understand the role of defects in maintaining framework integrity and oxygen redox.
Main Results:
- Achieved 85.77% capacity retention and 0.38 mV/cycle voltage decay after 500 cycles at 1C.
- Demonstrated that coupled defects maintain the layered framework and occupancy sequence.
- Showcased a stable coordination environment for oxygen redox reactions.
Conclusions:
- Interlayer TM-vacancy coupling defects effectively suppress layered phase degradation and promote reversible anionic reactions.
- This defect engineering strategy provides a pathway to simultaneously achieve high energy density and long cycle-life in LLO cathodes.
- The findings highlight the potential of coupling defects for advanced battery materials.
