期刊
MATERIALS TODAY
卷 51, 期 -, 页码 87-95出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mattod.2021.09.023
关键词
Zinc batteries; Bismuth-antimony alloy; Conversion reaction; Low temperature battery
资金
- National Key R&D Program of China [2019YFA0705104]
- GRFs [CityU 11305218, CityU 11212920]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06G587]
- Shenzhen Sci-Tech Fund [KYTDPT20181011104007]
- US Department of Energy, Office of Science -Chicago [DE-SC0019300]
A high-performance aqueous Zn battery using BiSb alloy cathode with a unique electrochemical mechanism has been developed, exhibiting large capacity, superior rate capability, and long-term cyclability. The research demonstrates the promising potential of metal cathodes and alloys for achieving high performance in Zn batteries.
Although a large number of intercalation cathode materials for aqueous Zn batteries have been reported, limited intercalation capacity precludes achieving a higher energy density. Here we develop a high-performance aqueous Zn battery based on BiSb alloy (Bi0.5Sb0.5) using a high-concentrated strong-basic polyelectrolyte. We demonstrate that a conversion-dissolution/deposition electrochemical mechanism (BiSb <-> Bi + SbO2- <-> Bi + SbO3- <-> Bi2O3) through in situ X-ray diffraction (XRD), Raman, and ex-situ X-ray photoelectron spectrometry (XPS) characterizations with the help of density functional theory calculations. The BiSb cathode delivers large capacity of 512 mAh g(-1) at 0.3 Ag-1 and superior rate capability of 90 mAh g(-1) even at 20 Ag-1 , and long-term cyclability with capacity retentions of 184 mAh g(-1) after 600 cycles at 0.5 Ag-1 and 130 mAh g(-1) after 1300 cycles at 1 Ag-1. Remarkably, even at temperatures as low as -10 and -20 degrees C, capacities of 210 and 197 mAh g(-1) are reserved at 1 Ag-1 , respectively. Moreover, the prepared pouch Zn//BiSb battery delivers a high energy density of 303 Wh kg(BiSb)(-1) at 0.3 Ag-1. When coupled with a high concentration polyelectrolyte, the Zn/BiSb battery exhibits an excellent performance over a wide temperature range (-40 to 40 degrees C). Our research reveals the metal cathode is promising for Zn batteries to achieve a high performance with the unique mechanism and alloys can be an effective approach to stabilize metal electrodes for cycling.
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