Multi-Functional Additive with Triple Regulation Mechanisms for Long-Life Zinc-Ion Batteries

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Aqueous zinc-ion batteries (ZIBs) offer a safe and cost-effective energy storage solution.
• Key challenges limiting ZIBs lifespan include dendrite formation, hydrogen evolution, and parasitic reactions.
• Electrolyte additives can mitigate these issues, but their precise mechanisms require further elucidation.

Purpose of the Study:

• To investigate L-glutamic acid (Glu) as an electrolyte additive for enhancing ZIB performance.
• To systematically clarify the fundamental roles of Glu in improving ZIB stability and capacity.
• To develop long-lasting ZIBs with improved electrochemical characteristics.

Main Methods:

• Utilized L-glutamic acid as an electrolyte additive in aqueous ZIBs.
• Conducted systematic studies to understand the influence of Glu on solvation structures and kinetics.
• Performed electrochemical testing on Zn||Zn symmetrical and Zn||MnO2 full batteries.

Main Results:

• Glu addition tailored solvation structures, accelerated desolvation kinetics, and reinforced interfacial interactions.
• Zn||Zn symmetrical batteries demonstrated exceptional cycling stability over 4,500 hours.
• Zn||MnO2 full batteries exhibited improved capacity and retained 80.41% after 1,000 hours.

Conclusions:

• L-glutamic acid effectively enhances the performance and longevity of aqueous ZIBs.
• The study provides fundamental insights into the additive's role in regulating battery chemistry and interfaces.
• Glu is a promising additive for developing high-performance, long-lifespan aqueous zinc-ion batteries.