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Published on: November 11, 2013
Surface-Stabilized High-Entropy Layered Oxyfluoride Cathode for Lithium-Ion Batteries.
Qinfeng Zheng1, Zhouhong Ren1, Yixiao Zhang1
1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Electrochemical Energy Device Research Center (SEED) and In-situ Center for Physical Sciences, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
Fluorine substitution in high-entropy layered cathode materials enhances structural stability and electrochemical performance for lithium-ion batteries (LIBs). This approach suppresses surface phase formation, improving battery longevity and capacity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- High-entropy materials enhance structural stability and electrochemical performance in layered cathode materials for lithium-ion batteries (LIBs).
- Surface structural stability and electrochemical performance remain suboptimal in current high-entropy LIB cathode materials.
Purpose of the Study:
- To investigate the effect of fluorine substitution on the structural stability and electrochemical performance of high-entropy layered cathode materials.
- To develop a novel fluorine-substituted high-entropy layered cathode material for improved LIB performance.
Main Methods:
- Synthesized a new fluorine-substituted high-entropy layered cathode material: Li1.2Ni0.15Co0.15Al0.1Fe0.15Mn0.25O1.7F0.3 (HEOF1).
- Partially substituted oxygen with fluorine in a previously reported high-entropy layered oxide.
- Evaluated electrochemical performance through discharge capacity and cycling stability tests.
Main Results:
- The HEOF1 material delivered a discharge capacity of 85.4 mAh g−1 with 71.5% capacity retention after 100 cycles.
- This represents a significant improvement over the parent material (LiNi0.2Co0.2Al0.2Fe0.2Mn0.2O2), which showed 57 mAh g−1 and 9.8% retention after 50 cycles.
- Improved performance is attributed to the suppression of detrimental surface M3O4 phase formation.
Conclusions:
- Fluorine substitution is an effective strategy to stabilize the surface structure of high-entropy layered cathode materials.
- This approach significantly enhances the electrochemical performance and cycling stability of LIBs.
- The study presents a promising avenue for developing advanced high-entropy cathode materials for next-generation lithium-ion batteries.
