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High-Capacity Zinc Anode Enabled by a Recyclable Biomass Bamboo Membrane Separator
Jianfeng Ma1, Xin Shi2, Zhihui Wang1
1Key Lab of Bamboo and Rattan Science & Technology, International Center for Bamboo and Rattan, Beijing, 100102, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|September 10, 2024
Summary
Researchers developed a novel bamboo membrane separator to control water activity in aqueous zinc ion batteries. This new separator enhances zinc anode stability, enabling ultrahigh rate performance and long-term cycling stability.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous zinc ion batteries (AZIBs) are promising for energy storage.
- Zinc anodes suffer from dendrite formation and side reactions, limiting AZIB performance.
- Controlling water activity is key to improving AZIB stability, but current methods have limitations.
Purpose of the Study:
- To introduce a novel oxygen-functionalized biomass bamboo membrane separator (BM) for AZIBs.
- To investigate the mechanism of water molecule activity control by the BM separator.
- To evaluate the electrochemical performance of AZIBs utilizing the BM separator.
Main Methods:
- Fabrication of an oxygen-functionalized bamboo membrane separator.
- Characterization of the separator's structure and functional groups.
- Electrochemical testing of Zn/Zn asymmetric cells and full cells using the BM separator.
Main Results:
- The BM separator effectively restrained water activity by forming hydrogen bonds.
- Zn/Zn asymmetric cells demonstrated stable operation at 30 mA cm⁻² for over 80 hours.
- Full cells achieved 89.7% capacity retention after 1000 cycles at 10 A g⁻¹.
Conclusions:
- Water activity control is crucial for protecting zinc anodes in AZIBs.
- The BM separator offers a novel strategy for enhancing AZIB performance.
- This work provides insights for designing advanced separators for aqueous metal batteries.
