Yang Meng, Chen Ru, Shen Yinlin, Zhao Xiangyu, Shen Xiaodong
State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211816, China.
Adv Mater. 2020 Sep;32(38):e2001106. doi: 10.1002/adma.202001106. Epub 2020 Aug 16.
Aqueous rechargeable batteries show great application prospects in large-scale energy storage because of their reliable safety and low cost. However, a key challenge in developing this battery system lies in its low energy density. Herein, a high-energy manganese-metal hydride (Mn-MH) hybrid battery is reported in which a Mn-based cathode operated by the Mn /MnO deposition-dissolution reactions, a hydrogen-storage alloy anode that absorbs and desorbs hydrogen in an alkaline solution, and a proton-exchange membrane separator are employed. Given the benefit derived from the high solubility and high specific capacity of the Lewis acidic MnCl in the cathode and the low electrode potential of the MH anode, this aqueous Mn-MH hybrid battery exhibits impressive electrochemical properties with admirable discharge voltage plateaus up to 2.2 V, a competitive energy density of about 240 Wh kg (based on the total mass of the 5.5 m MnCl solution and the hydrogen storage alloy electrode system), good cycling stability over 130 cycles, and a desirable rate capability. This work demonstrates a new strategy for achieving high-performance and low-cost aqueous rechargeable batteries.
水系可充电电池因其可靠的安全性和低成本，在大规模储能领域展现出巨大的应用前景。然而，开发这种电池系统的一个关键挑战在于其能量密度较低。在此，报道了一种高能锰 - 金属氢化物（Mn - MH）混合电池，该电池采用了通过Mn/MnO沉积 - 溶解反应运行的锰基阴极、在碱性溶液中吸收和解吸氢的储氢合金阳极以及质子交换膜分离器。鉴于阴极中路易斯酸性MnCl的高溶解度和高比容量以及MH阳极的低电极电位所带来的优势，这种水系Mn - MH混合电池展现出令人印象深刻的电化学性能，具有高达2.2 V的令人钦佩的放电电压平台、约240 Wh kg的有竞争力的能量密度（基于5.5 m MnCl溶液和储氢合金电极系统的总质量）、超过130次循环的良好循环稳定性以及理想的倍率性能。这项工作展示了一种实现高性能和低成本水系可充电电池的新策略。
