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Updated: May 23, 2026
10:03
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Cutoff-voltage-dependent low-voltage structural evolution and apparent capacity balancing in spinel LiFe0.5Mn1.5O4
Zuojun Yang1, Shun Zheng1, Guokang Chen1
1School of Chemistry and Chemical Engineering, In-situ Center for Physical Sciences, Shanghai Electrochemical Energy Device Research Center (SEED), Shanghai Jiao Tong University, Shanghai 200240, P.R. China. yxzhang2019@sjtu.edu.cn.
Chemical Communications (Cambridge, England)
|May 22, 2026
Summary
Deep discharging spinel LiFe0.5Mn1.5O4 batteries can offer more power, but risk structural damage. Researchers found that limiting the discharge cutoff to 2.5 V prevents this degradation, maintaining battery performance through phase coexistence.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Spinel lithium iron manganese oxide (LiFe0.5Mn1.5O4) is a promising cathode material for lithium-ion batteries.
- Deep discharge can unlock additional capacity but often leads to rapid structural degradation and poor cycle life.
Purpose of the Study:
- To investigate the effects of deep discharge on the structural stability and electrochemical performance of LiFe0.5Mn1.5O4.
- To identify strategies for mitigating degradation during deep discharge cycling.
Main Methods:
- Electrochemical cycling of LiFe0.5Mn1.5O4 at different discharge cutoff potentials (e.g., 1.9 V and 2.5 V).
- Structural analysis using techniques like X-ray diffraction (XRD) to monitor phase evolution and structural integrity.
- Interfacial characterization to understand degradation mechanisms.
Main Results:
- Discharging LiFe0.5Mn1.5O4 to 1.9 V induces severe structural distortion and interfacial reconstruction, leading to capacity fade.
- Limiting the discharge cutoff to 2.5 V significantly mitigates structural damage and preserves capacity.
- A cubic-tetragonal phase coexistence near 2.7 V is observed during cycling at 2.5 V, contributing to sustained capacity.
Conclusions:
- Optimizing the discharge cutoff potential is crucial for maintaining the structural integrity and electrochemical performance of LiFe0.5Mn1.5O4.
- A discharge cutoff of 2.5 V offers a viable strategy to balance additional capacity with long-term cyclability in these spinel materials.
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