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Updated: Feb 1, 2026
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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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Cu-Substituted NiF2 as a Cathode Material for Li-Ion Batteries
Cesar Villa1, Sungkyu Kim1,2, Yixue Lu1
1Department of Materials Science and Engineering, NUANCE Center , Northwestern University , Evanston , Illinois 60208 , United States.
ACS Applied Materials & Interfaces
|December 7, 2018
Summary
Copper substitution in metal fluorides significantly improves cycling stability and capacity for high-power lithium-ion batteries by reducing volumetric expansion and fluorine loss during operation.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Metal fluorides are promising for high-power lithium-ion batteries due to high electronegativity.
- However, they suffer from large volumetric expansion and capacity loss during cycling.
Purpose of the Study:
- To investigate the effect of copper (Cu) substitution for nickel (Ni) in binary NiF2.
- To understand how ternary metal fluorides with varying Cu/Ni ratios impact electrochemical properties.
Main Methods:
- In situ transmission electron microscopy (TEM) was used to observe structural evolution.
- Electrochemical properties of ternary metal fluorides were correlated with structural changes.
Main Results:
- Increased Cu substitution (0-25 wt%) reduced areal expansion during initial lithiation.
- Fluorine loss, indicating irreversibility, decreased with higher Cu content.
- Improved cycling stability and capacity were observed with Cu substitution.
Conclusions:
- Copper substitution effectively mitigates major issues in metal fluoride cathodes.
- This strategy offers a pathway for developing advanced ternary metal fluorides for high-power lithium-ion batteries.
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