Constructing Lysozyme Protective Layer via Conformational Transition for Aqueous Zn Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Biomaterials

Background:

• Aqueous zinc ion batteries (ZIBs) offer promising applications but face challenges due to side reactions on the zinc metal anode.
• Developing stable protective layers is crucial for enhancing the performance and longevity of ZIBs.

Purpose of the Study:

• To develop a facile and effective method for creating a protective layer on zinc metal surfaces for aqueous ZIBs.
• To investigate the properties and performance of a lysozyme protective layer (LPL) for inhibiting side reactions and improving Zn anode stability.

Main Methods:

• A lysozyme protective layer (LPL) was prepared on Zn metal via a self-adsorption strategy.
• The LPL's morphology, adhesion, and interaction with Zn2+ ions were characterized.
• Performance was evaluated using symmetrical Zn batteries and Zn/Zn0.25V2O5 pouch cells.

Main Results:

• The LPL demonstrated strong adhesion and a gap-free morphology, effectively preventing water-induced side reactions.
• Lysozyme conformation changes exposed functional groups that modified the electrical double layer (EDL), reduced desolvation energy, and accelerated ion diffusion.
• Symmetrical Zn batteries achieved over 1200 hours of cycling at 77.7% depth of discharge (DOD).
• Zn/Zn0.25V2O5 pouch cells showed over 300 cycles with a low N/P ratio (2.1) at 48% Zn utilization.

Conclusions:

• The lysozyme protective layer provides a stable interface for Zn metal anodes in aqueous ZIBs.
• This facile and low-cost method significantly improves Zn anode stability and battery performance.
• The study offers a viable strategy for high-utilization aqueous devices.