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Updated: Aug 5, 2026
11:25
In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
Published on: November 10, 2014
Decoupled Interface Passivation Enabled by Directional Ion Migration in Lithium-Ion Batteries
Juhwi Park1, Jooeun Byun2, Chae Rim Lee2
1Advanced Batteries Research Center, Korea Electronics Technology Institute, 25, Saenari-ro, Seongnam, Republic of Korea.
Small (Weinheim an Der Bergstrasse, Germany)
|August 3, 2026
Summary
Researchers developed a novel ionic molecule to stabilize lithium-ion battery interfaces. This additive enhances long-term cycleability by preventing degradation and improving performance in high-energy batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Long-term performance of lithium-ion batteries is hindered by interfacial degradation and irreversible lithium loss.
- Parasitic electrolyte decomposition and solid electrolyte interphase formation contribute to battery aging.
Purpose of the Study:
- To design an ionic molecule for decoupled interfacial passivation in graphite/NCM811 cells.
- To improve the cycleability and stability of high-energy-density lithium-ion batteries.
Main Methods:
- Designed an ionic molecule with individually functionalized cation and anion components.
- Utilized directional ion migration for selective decomposition at opposite electrodes.
- Evaluated performance using 1.2 A h pouch cells at elevated temperatures.
Main Results:
- Formed a nitrogen-rich interphase on the negative electrode and a sulfur-containing film on the positive electrode.
- Achieved simultaneous stabilization of both interfaces with a single additive.
- Demonstrated improved capacity retention, higher Coulombic efficiency, and suppressed resistance growth over 600 cycles.
Conclusions:
- Directional ion migration is a viable design principle for electrolyte additives.
- The developed additive offers a unified strategy for interfacial stabilization in lithium-ion batteries.
- This approach effectively suppresses electrolyte decomposition, salt degradation, and irreversible lithium consumption.
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