Journal
MATERIALS TODAY
Volume 43, Issue -, Pages 53-61Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mattod.2020.11.019
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Funding
- National Natural Science Foundation of China [52072352, 21875226]
- Foundation for the Youth S&T Innovation Team of Sichuan Province [2020JDTD0035]
- Tianfu Rencai Plan
- Science Foundation for Distinguished Young Scholars of Sichuan Province [2017JQ0036]
- Chengdu Rongpiao Talent plan, Science and Technology Projects for Administration for Market Regulation of Sichuan Province [SCSJ2020016]
- Rencai Plan of China Science City
- U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office under the Clean Vehicles program, US-China Clean Energy Research Centre (CERC-CVC2)
- DOE Office of Science [DE-AC02-06CH11357]
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The oxygen-deficient NH4V4O10-x·nH(2)O (NVOH) microspheres are synthesized and used as cathodes for aqueous zinc batteries (AZBs), demonstrating a high energy density, fast Zn2+ diffusion, and excellent electrochemical performance over a wide temperature range. The NVOH shows a capacity retention of 100% after 100 cycles at 0.1 A g(-1) and around 94% after 2600 cycles at 2 A g(-1) and -30 degrees C. Investigation into the mechanism of the process reveals that the surface capacitive behaviors contribute dominantly to the capacity, while diffusion-controlled capacity decay causes the capacity attenuation. Flexible AZBs can power portable electronics steadily under different bending states, showing great potential for wide-temperature wearable devices.
Aqueous zinc batteries (AZBs) have received significant attention owing to environmental friendliness, high energy density and inherent safety. However, lack of high-performance cathodes has become the main bottleneck of AZBs development. Here, oxygen-deficient NH4V4O10-x center dot nH(2)O (NVOH) microspheres are synthesized and used as cathodes for AZBs. The experimental test and theoretical calculations demonstrate that the oxygen vacancies in the lattice lower the Zn2+ diffusion energy barrier, which enables fast Zn2+ diffusion and good electrochemical performance in a wide temperature range. The suppressed side reactions also can help to improve the low temperature performance. NVOH shows a high energy density of 372.4 Wh kg(-1) and 296 Wh kg(-1) at room temperature and -30 degrees C, respectively. Moreover, NVOH maintains a 100% capacity retention after 100 cycles at 0.1 A g(-1) and similar to 94% capacity retention after 2600 cycles at 2 A g(-1) and -30 degrees C. Investigation into the mechanism of the process reveals that the capacity contribution of surface capacitive behaviors is dominant and capacity attenuation is mainly caused by the decay of diffusion-controlled capacity. Furthermore, flexible AZBs can steadily power portable electronics under different bending states, demonstrating its great potential in wide-temperature wearable device.
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