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Relieving Stress Concentration through Anion-Cation Codoping toward Highly Stable Nickel-Rich Cathode
Yu Zhou1, Hanwei Zhang1, Yinglei Wang2,3
1School of Material science and Engineering, Jiangsu University, Zhenjiang 212013, China.
ACS Nano
|October 4, 2023
Summary
Codoping nickel-rich lithium-ion battery cathodes with fluorine and magnesium enhances stability and performance. This strategy alleviates structural stress and improves capacity retention for advanced energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Nickel-rich lithium nickel cobalt aluminum oxide (NCA) is a promising cathode material for lithium-ion batteries due to its high energy density.
- Structural instability, including lithium-nickel mixing and oxygen vacancies, causes capacity degradation in NCA cathodes.
- Developing strategies to enhance the structural integrity and electrochemical performance of NCA is crucial for next-generation batteries.
Purpose of the Study:
- To address the structural instability and capacity degradation issues in nickel-rich NCA cathodes.
- To investigate the synergistic effects of anion (F-) and cation (Mg2+) codoping on NCA performance.
- To improve the electrochemical performance and cycle life of NCA at high operating voltages.
Main Methods:
- Facile codoping of F- and Mg2+ into LiNi0.8Co0.15Al0.015O2 (NCA) structure.
- Electrochemical performance testing, including cycling stability and rate capability at high voltage (≥4.5 V).
- Experimental and theoretical studies to elucidate the mechanisms of improved performance, focusing on Li+ diffusion and structural stability.
Main Results:
- The codoped Li0.99Mg0.01Ni0.8Co0.15Al0.05O0.98F0.02 (Mg1+F2) material exhibited significantly improved electrochemical performance compared to pristine and singly doped NCA.
- Mg2+ and F- codoping effectively alleviated Li+/Ni2+ mixing and suppressed oxygen escape, enhancing structural integrity.
- The Mg1+F2 cathode demonstrated a capacity retention of 82.65% after 200 cycles (1 C, 2.8-4.5 V), outperforming pristine NCA (55.69%).
- Pouch cells using Mg1+F2 cathodes showed 89.6% capacity retention after 500 cycles, compared to 79.4% for NCA.
Conclusions:
- Anion-cation codoping with F- and Mg2+ is an effective strategy to enhance the structural stability and electrochemical performance of nickel-rich NCA cathodes.
- The synergistic effect of F- and Mg2+ improves Li+ diffusion kinetics and suppresses detrimental side reactions, leading to superior cycle life.
- This codoping approach offers a promising pathway for developing high-performance, stable cathodes for advanced lithium-ion batteries.
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