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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
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Entropy-Tuned Layered Oxide Cathodes for Potassium-Ion Batteries
Shu Li1, Lichen Wu1, Hongwei Fu1
1School of Physics and Electronics, Hunan University, Changsha, 410082, P. R. China.
Small Methods
|September 15, 2023
Summary
Entropy-tuning of manganese-based cathode materials enhances potassium ion battery (PIB) performance by suppressing detrimental Mn3+ Jahn-Teller distortion. This strategy improves ion kinetics and capacity retention for advanced energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Manganese-based layered oxides are promising cathode materials for potassium ion batteries (PIBs) due to their low cost and high capacity.
- However, irreversible phase transitions and Mn3+ Jahn-Teller distortion limit their electrochemical performance, causing poor kinetics and capacity fade.
Purpose of the Study:
- To address the limitations of manganese-based cathodes in PIBs by employing an entropy-tuning strategy.
- To investigate the effect of varying composition on the electrochemical properties of K0.45MnxCo(1-x)/4Mg(1-x)/4Cu(1-x)/4Ti(1-x)/4O2.
Main Methods:
- Synthesis and characterization of low, medium, and high entropy variants of K0.45MnxCo(1-x)/4Mg(1-x)/4Cu(1-x)/4Ti(1-x)/4O2 (x = 0.8, 0.6, 0.4).
- Electrochemical performance evaluation of the synthesized cathode materials in PIBs, including capacity, rate capability, and cycling stability.
- Analysis of entropy-tuned suppression of Jahn-Teller distortion and its impact on K+ ion transport and volume variation.
Main Results:
- The medium entropy K0.45Mn0.6Co0.1Mg0.1Cu0.1Ti0.1O2 cathode demonstrated superior electrochemical properties compared to low and high entropy counterparts.
- This medium entropy material exhibited suppressed Jahn-Teller distortion, leading to enhanced K+ ion transport and reduced volume variation.
- The full cell using this cathode achieved a high capacity of 100 mAh g-1 at 50 mA g-1, with excellent rate capability (65.8 mAh g-1 at 500 mA g-1) and cycling stability (67.8 mAh g-1 after 350 cycles).
Conclusions:
- Entropy-tuning is an effective strategy to optimize the performance of manganese-based cathode materials for potassium ion batteries.
- The medium entropy composition K0.45Mn0.6Co0.1Mg0.1Cu0.1Ti0.1O2 offers a promising pathway for developing high-performance PIBs.
- This approach provides new avenues for designing advanced cathode materials for beyond lithium-ion battery technologies.
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