The traditional Zn/MnO2 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 MnO2/MnOOH is in solid state with limited reversibility, here a new aqueous rechargeable Zn/MnO2 flow battery is constructed with dissolution–precipitation reactions in both cathodes (Mn2+/MnO2) and anodes (Zn2+/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.
Membrane‐Free Zn/MnO2 Flow Battery for Large‐Scale Energy Storage
Guodong Li,Wei Chen,Hao Zhang,Y. Gong,Feifei Shi,Jiangyan Wang,Rufan Zhang,Guangxu Chen,Yang Jin,Tong Wu,Zhiyong Tang,Yi Cui
Published 2020 in Advanced Energy Materials
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- Publication year
2020
- Venue
Advanced Energy Materials
- Publication date
2020-01-31
- Fields of study
Materials Science, Chemistry, Engineering, Environmental Science
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