期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 27, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202101579
关键词
carbon nanotube; high rate; long cycle life; manganese dioxide; Zn‐ ion battery
类别
资金
- National Key Research and Development Program of China [2020YFB1312902, 2016YFA0203301]
- National Natural Science Foundation of China [21975281, 21773293]
- Jiangsu Planned Projects for Postdoctoral Research Funds [2019K048]
- Suzhou Science and Technology Plan Project [SYG201926]
The research achieved high durability and energy density in rechargeable Zn-MnO2 batteries by adjusting Mn2+ concentration and utilizing a 3D carbon nanotube foam skeleton. This approach enabled a reversible MnO2/Mn2+ redox conversion and resulted in a battery with extremely high durability, high energy density, and high-rate capacity.
Rechargeable Zn-MnO2 batteries are boosted by the reversible intercalation reactions in mild aqueous electrolytes, but they still suffer from cathode degradation. Herein, Zn-MnO2 batteries with high durability and high energy density are achieved by supplementing MnO2 deposition and dissolution in a mild aqueous electrolyte. The main finding is that adjusting Mn2+ concentration to a critical range enables a reversible MnO2/Mn2+ redox conversion without the involvement of oxygen evolution. This can recycle the by-products from MnOOH disproportionation (MnOOH -> MnO2 + Mn2+), resulting in a battery with extremely high durability (16 000 cycles without obvious capacity fading), high energy density (602 Wh kg(-1) based on the active mass of the cathode), and high-rate capacity (430 mAh g(-1) at 19.5 A g(-1)). The utilization of a 3D carbon nanotube foam skeleton can accommodate the volume change during MnO2 deposition/dissolution and provide paths for efficient charge and mass transport. This work provides a feasible way to push the development of Zn-MnO2 batteries in mild aqueous electrolytes.
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