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Cation/Anion Codoped and Cobalt-Free Li-Rich Layered Cathode for High-Performance Li-Ion Batteries
Lu Nie1, Zeyu Wang1, Xiaowen Zhao1
1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Nano Letters
|September 20, 2021
Summary
This study introduces a new cobalt-free lithium-rich layered cathode material, enhanced with iron and chlorine. This doping strategy significantly improves structural stability, mitigating voltage fade and boosting performance for better energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-rich layered oxides are promising cathode materials for high-energy-density applications.
- These materials suffer from structural instability, leading to voltage fade and capacity decay due to transition-metal migration and oxygen release.
Purpose of the Study:
- To develop a stable and high-performance cathode material for lithium-ion batteries.
- To investigate the effects of iron (Fe) and chlorine (Cl) codoping on the structural stability and electrochemical performance of lithium-rich layered oxides.
Main Methods:
- Synthesis of Fe, Cl codoped, cobalt-free Li-rich layered cathode material.
- Electrochemical characterization to evaluate performance metrics such as rate capability and cycle stability.
- Computational calculations to understand the structural and electronic effects of doping.
Main Results:
- Fe and Cl codoping significantly enhanced the structural stability of the layered oxide.
- The codoped material exhibited improved lithium-ion diffusion and superior rate performance.
- Reduced irreversible lattice oxygen release, mitigated voltage fade, and improved first-cycle Coulombic efficiency were observed.
Conclusions:
- Fe and Cl codoping is an effective strategy to stabilize lithium-rich layered oxide cathodes.
- This approach offers a low-cost, environmentally friendly pathway to high-performance cathode materials for advanced batteries.
- The findings pave the way for practical applications of stable, high-energy-density cathode materials.
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