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Published on: September 29, 2020
Dimensional Engineering-Driven V/O Defect Modulation for Ultrahigh-Energy-Density Aqueous Zinc-Ion Batteries.
Zhihao Deng1, Wu Shao1, Jie Sheng1
1Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
Researchers developed a new defect-rich ammonium vanadate cathode for aqueous zinc-ion batteries (AZIBs). This material significantly boosts energy density and cycling stability, offering a promising advancement for next-generation energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Aqueous zinc-ion batteries (AZIBs) face challenges in achieving high energy density, optimizing Zn2+ kinetics, and redox activity.
- Developing efficient cathode materials is crucial for advancing AZIB technology.
Purpose of the Study:
- To engineer a novel cathode material for AZIBs with enhanced performance.
- To investigate the role of in situ structure and defect engineering in improving battery characteristics.
Main Methods:
- Utilized glutamic acid as a structural regulator during hydrothermal synthesis of ammonium vanadate.
- Induced dimensional transformation and created a high density of V/O defects in the ammonium vanadate structure.
- Characterized the material's electrochemical performance as a cathode in AZIBs.
Main Results:
- The defect-rich ammonium vanadate (V/O-NHVO) cathode exhibited a high specific capacity (567.9 mAh g-1 at 0.1 A g-1) and energy density (433 Wh kg-1).
- The material demonstrated excellent cycling stability, retaining 87.9% capacity over 2000 cycles, and a peak power density of 3575 W kg-1.
- The engineered material also showed promising performance in aqueous magnesium-ion batteries.
Conclusions:
- In situ structure and defect engineering using glutamic acid is an effective strategy for developing high-performance AZIB cathode materials.
- The V/O-NHVO material offers a compelling design paradigm for aqueous multivalent-ion batteries.
- The engineered defects and interlayer water significantly enhance redox kinetics and reaction reversibility.
