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A Layer-by-Layer Self-Assembled Bio-Macromolecule Film for Stable Zinc Anode
Xinxin Cai1, Xiaoxu Wang2, Zhe Bie1
1Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|October 16, 2023
Summary
A novel layer-by-layer film of chitosan and sodium alginate stabilizes zinc anodes in aqueous zinc-ion batteries (AZIBs), significantly extending battery life and preventing dendrite formation for practical applications.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Energy
Background:
- Side reactions on zinc anodes limit the lifespan of aqueous zinc-ion batteries (AZIBs).
- Developing stable and long-lasting AZIBs is crucial for energy storage solutions.
Purpose of the Study:
- To create a robust and ion-conductive interface for stabilizing zinc anodes.
- To enhance the cycle life and performance of AZIBs using a bio-macromolecule-based protective layer.
Main Methods:
- Utilized a facile layer-by-layer (LbL) self-assembly technique.
- Constructed an electrolyte/anode interface using chitosan (CS) and sodium alginate (SA).
- Investigated the effect of the LbL film on zinc ion solvation and deposition.
Main Results:
- The (CS/SA)₄-Zn symmetric cells demonstrated stable cycling for over 6500 hours.
- The full coin cells achieved a capacity of 125.5 mAh g⁻¹ after 14,000 cycles with no observed dendrites.
- Pouch cells showed 83% capacity retention over 500 cycles, highlighting scalability.
Conclusions:
- The CS/SA LbL film effectively stabilizes the zinc anode by tailoring the solvation sheath and promoting uniform zinc deposition.
- This cost-effective, environmentally friendly approach significantly enhances AZIB performance and longevity.
- The developed Zn protection strategy shows promise for the industrial application of AZIBs.
