期刊
NANO ENERGY
卷 63, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.06.018
关键词
Zinc accumulation; Oxygen redox reaction; Energy storage; Zinc nickel flow battery; Zinc air flow battery
类别
资金
- Natural Science Foundation of China [21606015, 51502012, 21676020]
- National Key Research and Development Program of China [2017YFA0206500]
- Beijing Natural Science Foundation [17L20060, 2162032]
- Fundamental Research Funds for the Central Universities [buctrc201524, buctrc201420, buctrc201714]
- BUCT Fund for Disciplines Construction and Development [XK1502]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- Talent cultivation of State Key Laboratory of Organic-Inorganic Composites
- Open project of State Key Laboratory of Organic-Inorganic Composites [OIC-201801007]
- Distinguished Scientist Program at BUCT [buctylkxj02]
- 111 Project of China [B14004]
Zinc nickel flow battery is one of the most promising energy storage technologies for intermittently renewable solar and wind power. However, unpaired coulombic efficiency of nickel hydroxide cathode and zinc anode causes zinc accumulation in practical operation, which shortens the cycle life and impedes the commercialization of the battery. Here, we induce an additional O-2/OH- redox couple integrated with NiOOH/Ni(OH)(2) as cathode energy storage materials. Benefit from the new reaction mechanism of the hybrid cathode, deposited zinc upon charge can be fully consumed during discharge, which completely avoids zinc accumulation issue. The new designed battery vigorously operates for more than 1100 h with negligible performance degradation, while the energy efficiency of pristine zinc-nickel flow battery dramatically reduces after 440 h. More importantly, the specific capacity of the cathode synchronously increases by 2.5 times and thereby the energy density. This system dexterously integrates dual redox couples into one hybrid unit at cathode complementing advantages of one another, demonstrating a broader method to solve the problem of unpaired coulombic efficiency in zinc based flow batteries.
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