1. MnO 2 Nanosheet‐Assembled Hollow Polyhedron Grown on Carbon Cloth for Flexible Aqueous Zinc‐Ion Batteries
- Author
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Xinlong Gao, Xiehong Cao, Wenxian Liu, Gang Lu, Fangfang Wu, Ruilian Yin, Wenhui Shi, Xilian Xu, Jiang Yani, and Xiaobin Gao
- Subjects
Materials science ,Aqueous solution ,General Chemical Engineering ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,Zinc ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Hydrothermal circulation ,Cathode ,0104 chemical sciences ,law.invention ,General Energy ,chemistry ,law ,Electrode ,Environmental Chemistry ,General Materials Science ,0210 nano-technology ,Carbon ,Nanosheet ,Voltage - Abstract
Aqueous zinc-ion batteries (ZIBs) have been considered as prospective alternatives for lithium-ion batteries, which are able to serve as power sources for next-generation wearable and flexible devices, owing to the merits of abundant zinc resources and high safety of aqueous electrolyte. However, the lack of suitable cathode materials with flexibility for ZIBs hinders their further application. Herein, a novel cathode material [i.e., MnO2 nanosheet-assembled hollow polyhedron anchored on carbon cloth (MnO2 /CC)] was prepared through a rapid hydrothermal method by using ZIF-67 as self-sacrificing template. When tested in an aqueous ZIB, the MnO2 /CC delivered a high reversible capacity of 263.9 mAh g-1 at 1.0 A g-1 after 300 cycles, far exceeding those of the commercial MnO2 electrode. More importantly, benefiting from the unique structural advantages, a flexible ZIB assembled based on the MnO2 /CC displayed a stable output voltage of 1.53 V and a specific capacity of 91.7 mAh g-1 at 0.1 A g-1 after 30 cycles. It also successfully lit LED bulbs even under different bending angles, showing good flexibility. This research contributes to the development of MnO2 -based cathode materials for high-performance flexible ZIBs.
- Published
- 2020