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Enabling Fast and Stable Zinc-Ion Storage in Vanadyl Phosphate Cathodes
Xuelian Liu1, Quan Zong1,2, Keyi Chen1
1College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, Zhejiang, People's Republic of China.
Nano Letters
|February 26, 2025
Summary
Diethylene glycol (DEG) pre-intercalation enhances vanadium phosphate (VOP) cathode materials for aqueous zinc-ion batteries. This modification improves ion transport and stability, achieving 86% capacity retention after 2000 cycles.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Vanadium phosphate (VOPO4·2H2O, VOP) is a promising cathode material for aqueous zinc-ion batteries due to its layered structure and high-voltage characteristics.
- However, VOP suffers from poor Zn2+ transport kinetics and limited electrochemical stability in aqueous electrolytes, resulting in rapid capacity decay.
Purpose of the Study:
- To enhance the electrochemical performance and cycling stability of VOP as a cathode material for aqueous zinc-ion batteries.
- To investigate the effects of diethylene glycol (DEG) pre-intercalation on VOP's structure, ion transport, and stability.
Main Methods:
- A facile hydrothermal method was employed to synthesize diethylene glycol (DEG) pre-intercalated VOP (DEG-VOP) with a flower-like morphology.
- Characterization techniques were used to analyze the structural modifications, including enlarged lattice spacing and introduction of oxygen vacancies.
- Electrochemical performance was evaluated through galvanostatic cycling in aqueous zinc-ion battery systems.
Main Results:
- DEG pre-intercalation successfully enlarged the interplanar lattice of VOP's (001) plane and introduced oxygen vacancies, enhancing mass and charge transfer.
- The flower-like morphology, formed by self-assembled nanosheets, exposed more (201) planes, creating additional ion channels.
- DEG pre-intercalation improved VOP's hydrophobicity, suppressing electrolyte decomposition and dissolution, leading to superior cycling stability.
- The DEG-VOP cathode exhibited a significantly improved discharge capacity and retained 86% of its capacity after 2000 cycles at 1 A g-1.
Conclusions:
- Diethylene glycol pre-intercalation is an effective strategy to overcome the limitations of VOP in aqueous zinc-ion batteries.
- The modified DEG-VOP material demonstrates enhanced ion transport kinetics, improved structural stability, and excellent long-term cycling performance.
- This work offers a promising pathway for developing high-performance cathode materials for next-generation aqueous energy storage devices.
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