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Updated: May 10, 2026
11:25
Identification and Quantification of Decomposition Mechanisms in Lithium-Ion Batteries; Input to Heat Flow Simulation for Modeling Thermal Runaway
Published on: March 7, 2022
Deciphering the Dynamic Balance Between Solvation Strength and Polysulfides Reaction Heterogeneity in Practical
Huidong Dai1,2, Pranathi Garlapati1, Srinidi Badhrinathan1
1Giner Inc., Newton, Massachusetts, United States.
Summary
A novel fluorinated cosolvent, LIB 1200ET, stabilizes lithium-sulfur batteries by controlling interfacial chemistry. This approach enhances battery performance and longevity under practical conditions.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Stable interfacial chemistry is crucial for commercializing high-energy lithium-sulfur (Li-S) batteries.
- Current challenges include managing lithium polysulfide (LPS) solubility and solid-electrolyte interphase (SEI) formation.
Purpose of the Study:
- To regulate interfacial dynamics in Li-S batteries using a weakly solvating fluorinated cosolvent.
- To improve battery performance and stability under practical operating conditions.
Main Methods:
- Introduction of LIB 1200ET (a weakly solvating fluorinated cosolvent) to modulate Li+ solvation.
- Analysis of sulfur redox chemistry and SEI composition.
- Performance testing of single-layer and multilayer pouch cells under practical conditions.
Main Results:
- LIB 1200ET shifts Li+ solvation, suppressing LPS solubility and promoting a robust, LiF-reinforced SEI.
- The modified SEI exhibits enhanced ionic conductivity and mechanical stability.
- Practical pouch cells achieved high capacity retention (527 mAh g-1 over 200 cycles) and energy density (358 Wh kg-1).
Conclusions:
- Non-coordinating cosolvent-driven solvation engineering is a scalable strategy for advanced Li-S batteries.
- Effective management of interfacial chemistry is key to unlocking the potential of Li-S battery technology.
Keywords:
Li–S batteriespolysulfides reaction heterogeneitypractical pouch cellsolid–electrolyte interphasesolvation structureMore Related Videos
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