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Multifunctional Polymer Interphase with Fast Kinetics for Ultrahigh-rate Zn Metal Anode
Pan Xue1, Can Guo2, Wenbin Gong3
1School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225009, China.
Angewandte Chemie (International Ed. in English)
|February 4, 2025
Summary
A new polymer interphase using poly(phenazine-alt-pyromellitic anhydride) (PPPA) enhances aqueous zinc ion batteries (AZIBs). This stable interphase enables fast kinetics and high-rate performance, overcoming previous limitations for practical applications.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Aqueous zinc ion batteries (AZIBs) face challenges with dendrite growth and side reactions on Zn anodes.
- Existing polymer interphases improve stability but suffer from slow kinetics and high overpotentials, hindering high-rate applications.
- Need for advanced interphases that enable fast Zn plating/stripping and suppress unwanted reactions in AZIBs.
Purpose of the Study:
- To develop a multifunctional polymer interphase with fast kinetics for Zn anodes in AZIBs.
- To investigate the use of poly(phenazine-alt-pyromellitic anhydride) (PPPA) as an electrolyte additive for in situ SEI formation.
- To demonstrate the effectiveness of the PPPA interphase in improving Zn anode performance under high-rate conditions.
Main Methods:
- Synthesized poly(phenazine-alt-pyromellitic anhydride) (PPPA) as an electrolyte additive.
- Formed a stable solid-electrolyte interphase (SEI) layer on Zn anodes in situ using PPPA.
- Characterized the PPPA SEI layer's structure, composition, and electrochemical properties.
- Evaluated the electrochemical performance of Zn anodes and Zn||MnO2 full batteries with PPPA.
Main Results:
- The PPPA SEI layer effectively blocked water and regulated interfacial solvation, suppressing side reactions.
- The π-conjugated structure of PPPA facilitated rapid Zn2+ transport and de-solvation, enabling fast kinetics.
- Zn anodes with PPPA/ZnSO4 electrolyte achieved 98.3% Coulombic efficiency at 20 mA cm-2 and over 2000 cycles at 50 mA cm-2.
- A Zn||MnO2 full battery demonstrated excellent stability, retaining capacity after 5000 cycles at 2000 mA g-1.
Conclusions:
- Poly(phenazine-alt-pyromellitic anhydride) (PPPA) serves as an effective electrolyte additive for creating a fast-kinetics polymer interphase on Zn anodes.
- The engineered PPPA interphase significantly enhances the electrochemical performance and cycle life of AZIBs, particularly under high-rate conditions.
- Judicious design of polymer additives and interphases is crucial for advancing commercial AZIBs for high-rate applications.
