Li Na, Li Guoqing, Li Changji, Yang Huicong, Qin Gaowu, Sun Xudong, Li Feng, Cheng Hui-Ming
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
Shenyang National Laboratory for Materials Science, Institute of Metal Research Chinese Academy of Sciences, Shenyang 110016, China.
ACS Appl Mater Interfaces. 2020 Mar 25;12(12):13790-13796. doi: 10.1021/acsami.9b20531. Epub 2020 Mar 10.
Rechargeable aqueous zinc-ion batteries (ZIBs) are receiving increased attention because of their high safety and low cost. However, their practical application is plagued by their low energy density as a result of low output voltage and a narrow voltage window of aqueous electrolytes. Here, we explored a ZIB with a wider potential window using bication (1 M Al(CFSO)/1 M Zn(CFSO)) as the electrolyte and α-MnO as the cathode, obtaining a discharge voltage of 1.7 V, ∼0.3 V higher than the value reported earlier. The resultant cell delivers a record high energy density of 448 W h kg (based on MnO mass) and retains 100% capacity over 1000 cycles. The ion-storage mechanism and the role of Al in enlarging the output voltage were elucidated. This research indicates the important role of using bications in improving the electrochemical performance of aqueous ZIBs, opening a new way to increase the energy density of aqueous energy storage devices.
可充电水系锌离子电池（ZIBs）因其高安全性和低成本而受到越来越多的关注。然而，由于输出电压低和水系电解质的电压窗口窄，其实际应用受到低能量密度的困扰。在此，我们探索了一种使用双阳离子（1 M Al(CFSO)/1 M Zn(CFSO)）作为电解质和α-MnO作为阴极的具有更宽电位窗口的ZIB，获得了1.7 V的放电电压，比之前报道的值高约0.3 V。所得电池的能量密度达到创纪录的448 W h kg（基于MnO质量），并在1000次循环中保持100%的容量。阐明了离子存储机制以及Al在提高输出电压中的作用。这项研究表明了使用双阳离子在改善水系ZIBs电化学性能方面的重要作用，为提高水系储能装置的能量密度开辟了一条新途径。
