Reversible aqueous zinc/manganese oxide energy storage from conversion reactions
Reversible aqueous zinc/manganese oxide energy storage from conversion reactions
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DOI：
10.1038/nenergy.2016.39
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发表时间：
2016-04-18
期刊：
影响因子：
56.7
通讯作者：
Liu, Jun
中科院分区：
文献类型：
--
作者：
Pan, Huilin;Shao, Yuyan;Liu, Jun
可充电水性电池，如碱性锌/锰氧化物电池，由于其低成本和高安全性，是大规模储能的理想选择；然而，循环稳定性是其应用的一个主要问题。在这里，我们展示了一个高度可逆的锌/锰氧化物体系，其中最优的温和的基于znso4的水溶液作为电解质，锰氧化物相的纳米纤维，α - mno2，作为阴极。研究表明，mno2与H+之间的化学转化反应机制是该体系具有良好性能的主要原因。这包括1.44 V的工作电压，285 mAh g(-1) （MnO2）的容量，超过5000次循环的容量保持92%。锌金属阳极也表现出较高的稳定性。这一发现为开发低成本、高性能的可充电水性电池开辟了新的机会。
Rechargeable aqueous batteries such as alkaline zinc/manganese oxide batteries are highly desirable for large-scale energy storage owing to their low cost and high safety; however, cycling stability is a major issue for their applications. Here we demonstrate a highly reversible zinc/manganese oxide system in which optimal mild aqueous ZnSO4-based solution is used as the electrolyte, and nanofibres of a manganese oxide phase, alpha-MnO2, are used as the cathode. We show that a chemical conversion reaction mechanism between alpha-MnO2 and H+ is mainly responsible for the good performance of the system. This includes an operating voltage of 1.44 V, a capacity of 285 mAh g(-1) (MnO2), and capacity retention of 92% over 5,000 cycles. The Zn metal anode also shows high stability. This finding opens new opportunities for the development of low-cost, high-performance rechargeable aqueous batteries.