2025-8-19：祝贺邓荣誉博士研究论文在Advanced Functional Materials (IF 18.5)发表！
发布时间：2025-08-19
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Bifunctional Oxide Additive Enabling ![]()
High-Voltage Aqueous Zn/LiCoO2 Hybrid Batteries
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Rongyu Deng,1,2 Ashok S. Menon,3 Marc Walker,2 Louis F. J. Piper,3 Alex W. Robertson, *2 Feixiang Wu*1
* Corresponding author: A. W. Robertson (alex.w.robertson@warwick.ac.uk), F. Wu (feixiang.wu@csu.edu.cn)
Abstract: ![]()
The development of aqueous Zn/LiCoO2 hybrid batteries faces challenges such as poor reversibility, rapid capacity degradation, and severe side reactions in base electrolytes. Herein, this study proposes Al2O3 nanoparticles as a bifunctional additive in the base electrolyte, leading to a novel electrolyte that enhances the interfacial stability between electrolyte and electrode and improves the electrochemical performance. Al2O3 reduces the activity of water molecules, inhibits the interfacial side reactions, and enhances the reversibility and stability of redox reactions. Molecular dynamics (MD) simulations reveal that Al2O3 modifies the solvation structures of both Li+ and Zn2+, lowers their de-solvation energies, thereby improving ionic diffusion coefficients and promoting the reaction kinetics. Consequently, symmetric cells achieve a prolonged cycle life with uniform zinc deposition. The ![]()
Zn/LiCoO2 hybrid cells exhibit excellent rate performance, maintaining 81 mAh g-1 at 0.8 A g-1 and stable cycling over 300 cycles at 0.4 A g-1 within a broadened voltage range of 1.5-2.15 V vs. Zn/Zn2+. Additionally, these cells demonstrate ultrahigh capacity retention of 98.2% at 0 ℃ and 87% at a high mass loading of 5 mg cm-2 at 0.4 A g-1. This study presents a promising additive chemistry that significantly enhances the stability and performance of high-voltage aqueous hybrid batteries, paving the way for their practical application.
Key words: aqueous hybrid batteries, LiCoO2, additives, side reactions, zinc anode
