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Membrane‐Free Zn/MnO 2 Flow Battery for Large‐Scale Energy Storage
Author(s) -
Li Guodong,
Chen Wei,
Zhang Hao,
Gong Yongji,
Shi Feifei,
Wang Jiangyan,
Zhang Rufan,
Chen Guangxu,
Jin Yang,
Wu Tong,
Tang Zhiyong,
Cui Yi
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201902085
Subject(s) - flow battery , battery (electricity) , cathode , materials science , anode , electrolyte , energy storage , redox , dissolution , chemical engineering , electrochemistry , potassium ion battery , electrode , electrical engineering , metallurgy , chemistry , lithium vanadium phosphate battery , power (physics) , thermodynamics , physics , engineering
The traditional Zn/MnO 2 battery has attracted great interest due to its low cost, high safety, high output voltage, and environmental friendliness. However, it remains a big challenge to achieve long‐term stability, mainly owing to the poor reversibility of the cathode reaction. Different from previous studies where the cathode redox reaction of MnO 2 /MnOOH is in solid state with limited reversibility, here a new aqueous rechargeable Zn/MnO 2 flow battery is constructed with dissolution–precipitation reactions in both cathodes (Mn 2+ /MnO 2 ) and anodes (Zn 2+ /Zn), which allow mixing of anolyte and catholyte into only one electrolyte and remove the requirement for an ion selective membrane for cost reduction. Impressively, this new battery exhibits a high discharge voltage of ≈1.78 V, good rate capability (10C discharge), and excellent cycling stability (1000 cycles without decay) at the areal capacity ranging from 0.5 to 2 mAh cm ‐2 . More importantly, this battery can be readily enlarged to a bench scale flow cell of 1.2 Ah with good capacity retention of 89.7% at the 500th cycle, displaying great potential for large‐scale energy storage.