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Mitigating Lithium Dissolution and Polysulfide Shuttle Effect Phenomena Using a Polymer Composite Layer Coating on
Hyukmin Kweon1,2, William Kim-Shoemaker3
1Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA.
Polymers
|October 27, 2022
Summary
A new polymer composite layer effectively prevents polysulfide shuttle and lithium dissolution in high-energy lithium sulfur batteries (LISBs). This innovation enhances electrochemical stability and cycle life for advanced battery designs.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium sulfur batteries (LISBs) face challenges like lithium dissolution and polysulfide shuttle.
- These issues limit the cycle life and performance of high-energy density LISBs.
Purpose of the Study:
- To develop and evaluate a polymer composite layer for mitigating LISB degradation.
- To enhance the electrochemical stability and cycle life of LISBs.
Main Methods:
- Applied a conductive polymer composite layer (polyaniline and functionalized graphite) on the anode.
- Conducted galvanostatic charge/discharge tests (1.7–2.8 V, up to 90 cycles).
- Utilized COMSOL Multiphysics simulation for optimal layer property prediction.
Main Results:
- The polymer composite layer effectively prevented polysulfide shuttle, indicated by no overcharge.
- Simulation predicted optimal concentrations and properties for the composite layer.
- Reduced lithium polysulfide species and dissolved lithium ions were observed.
Conclusions:
- The polymer composite layer significantly improves electrochemical cycle stability in LISBs.
- Achieved a charge/discharge rate of 2.0 C with a 90-cycle life.
- Provides insights for designing advanced electrode materials and understanding polymer composite effects.
