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Regulating the Molecular Interactions in Polymer Binder for High-Performance Lithium-Sulfur Batteries
Qi Gong1, Lei Hou1, Tianyu Li2
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, P.R. China.
ACS Nano
|May 11, 2022
Summary
A novel polymer binder, PNAVS, effectively mitigates lithium polysulfide shuttle effects in lithium-sulfur batteries. This enhances cycling stability and areal capacity, paving the way for advanced battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Lithium-sulfur (Li-S) batteries offer high theoretical energy density but suffer from lithium polysulfide (LiPS) shuttle effects.
- Polymer binders are crucial for mitigating LiPS shuttling and improving Li-S battery performance.
- Further development of advanced polymer binders is needed for practical Li-S battery applications.
Purpose of the Study:
- To design and synthesize a novel, water-dispersible polymer binder (PNAVS) for Li-S batteries.
- To investigate the molecular interactions within the PNAVS binder for enhanced LiPS coordination.
- To evaluate the impact of PNAVS on Li-S battery performance, including shuttle effect alleviation, cycling stability, and rate capability.
Main Methods:
- Co-polymerization of N-acryloyl glycinamide and 3-(1-vinyl-3-imidazolio)propanesulfonate to create the PNAVS binder.
- Characterization of the PNAVS binder's chemical structure and physical properties.
- Electrochemical testing of Li-S cells incorporating the PNAVS binder, including cycling performance, impedance spectroscopy, and analysis of LiPS binding energy.
- Demonstration of a pouch cell utilizing the PNAVS binder.
Main Results:
- The PNAVS binder exhibits strong coordination with LiPSs, effectively suppressing the shuttle effect.
- Optimized Li+ diffusion coefficient within the PNAVS binder accelerates redox kinetics.
- Li-S batteries with PNAVS show ultrastable open circuit voltage (>3000 h) and excellent areal capacity (12.21 mA h cm-2) at high sulfur loading (11.7 mg cm-2).
- A pouch cell demonstrates stable cycling performance for 110 cycles.
Conclusions:
- The PNAVS binder, through molecular interaction modulation, significantly improves Li-S battery performance by alleviating the LiPS shuttle effect.
- The enhanced Li+ kinetics and stable electrochemical performance highlight the potential of PNAVS for high-performance Li-S batteries.
- Binder engineering strategies, like the one presented, are vital for advancing the practical application of Li-S battery technology.
