Membrane‐Free Zn/MnO2 Flow Battery for Large‐Scale Energy Storage,Advanced Energy Materials

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Membrane‐Free Zn/MnO2 Flow Battery for Large‐Scale Energy Storage
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-01-31 , DOI: 10.1002/aenm.201902085
Guodong Li _{1,

2} , Wei Chen ₁ , Hao Zhang _{1,

3} , Yongji Gong ₁ , Feifei Shi ₁ , Jiangyan Wang ₁ , Rufan Zhang ₁ , Guangxu Chen ₁ , Yang Jin ₁ , Tong Wu ₁ , Zhiyong Tang ₂ , Yi Cui _{1,

4}

Affiliation

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.

中文翻译：

用于大规模能量存储的无膜Zn / MnO2液流电池

传统的Zn / MnO ₂电池由于其低成本，高安全性，高输出电压和环境友好性而引起了人们的极大兴趣。然而，主要由于阴极反应的可逆性差，实现长期稳定性仍然是一个巨大的挑战。与以前的研究（其中MnO ₂ / MnOOH的阴极氧化还原反应处于固态且可逆性有限）不同，这里构建了一种新型的可再充电Zn / MnO ₂液流电池，在两个阴极中均具有溶解-沉淀反应（Mn ²⁺ / MnO ₂）和阳极（Zn ²⁺/ Zn），其允许将阳极电解液和阴极电解液混合到仅一种电解质中，并且消除了对用于降低成本的离子选择性膜的要求。令人印象深刻的是，这种新型电池在0.5至2 mAh cm ^-2的面积容量下，具有≈1.78V的高放电电压，良好的倍率能力（10C放电）和出色的循环稳定性（1000次循环而不会衰减）。更重要的是，该电池可以很容易地扩大到1.2 Ah的台式流通池，并在第500个循环中保持了89.7％的良好容量，显示了大规模储能的巨大潜力。

更新日期：2020-03-03

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