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High-Entropy-Based Micro-Doping Enables High-Energy-Density and Stable Layered Sodium Oxide Cathodes
Qingyun Yang1, Zhiliang Xiu1, Wenzhuo Zhang1
1School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|April 14, 2025
Summary
A novel high-entropy doping strategy enhances sodium ion battery cathodes, boosting energy density and cycle life. This breakthrough improves performance for practical sodium ion battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Transition metal layered oxides are promising cathode materials for sodium ion batteries (SIBs).
- Current SIB cathodes suffer from poor rate capability and limited cyclability, hindering commercialization.
- Developing advanced cathode materials is crucial for efficient energy storage solutions.
Purpose of the Study:
- To enhance the electrochemical performance of O3-type layered oxide cathodes for SIBs.
- To investigate the effect of high-entropy micro-doping on cathode properties.
- To establish a strategy for improving both energy density and cyclability in SIB cathodes.
Main Methods:
- Synthesis of a high-entropy-doped O3-type Na0.9(NiFeMn)0.3(CuMgAlTiSn)0.02O2 (HE-NFM) cathode material.
- Electrochemical characterization including rate capability and cycling tests.
- Density Functional Theory (DFT) calculations to understand the underlying mechanisms.
Main Results:
- The HE-NFM cathode achieved an ultrahigh energy density of 442 Wh kg⁻¹ at 0.1 C.
- High-rate capability (104.4 mAh g⁻¹ at 2 C) and excellent cyclability (95% capacity retention after 100 cycles at 1 C) were demonstrated.
- DFT calculations revealed reduced Na⁺ migration barriers and lower formation energy due to entropy-mediated stabilization.
Conclusions:
- High-entropy micro-doping is an effective strategy to enhance SIB cathode performance.
- The HE-NFM cathode exhibits superior energy density, rate capability, and cyclability compared to undoped materials.
- This approach offers a new paradigm for designing advanced cathode materials for next-generation sodium ion batteries.
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