期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 7, 页码 3785-3794出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta13081k
关键词
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资金
- National Natural Science Foundation of China [21703073, 51622703, 51774148]
- China Postdoctoral Science Foundation [2017 M622421]
Herein, a high energy efficiency and long life aqueous Zn-I-2 battery based on an activated carbon encapsulated I-2 (I-2@C-50) cathode is reported. It is found that an optimized electrolyte of Zn(CF3SO3)(2) can significantly boost the initial coulombic efficiency from 61.1% to 91.3% due to the coordination effect, which accounts for the high energy efficiency of the battery. Moreover, the in situ formed solid electrolyte interphase (SEI) film on the Zn surface can effectively stabilize Zn stripping/plating and ensure the long-term cycling stability of the aqueous Zn-I-2 battery. Besides, an activated carbon host with a large surface area, strong adsorption and spatial confinement suppresses the loss of active materials. As a result, the I-2@C-50 cathode realizes a capacity of 210 mA h g(-1) and a high energy efficiency of 96.7% at 0.1 A g(-1), and exhibits a capacity retention of 66% after 10 000 cycles at 5 A g(-1). In addition, pouch batteries with different sizes also demonstrate feasibility in practical applications. The results presented in this work provide insights on electrode, electrolyte and interface engineering to design high performance aqueous batteries.
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