Boosting Electrolytic MnO2-Zn Batteries by a Bromine Mediator

被引：76

作者：

Zheng, Xinhua ^{[1
]}

Wang, Yongchao ^{[2
]}

Xu, Yan ^{[1
]}

Ahmad, Touqeer ^{[1
]}

Yuan, Yuan ^{[1
]}

Sun, Jifei ^{[1
]}

Luo, Ruihao ^{[1
]}

Wang, Mingming ^{[1
]}

Chuai, Mingyan ^{[1
]}

Chen, Na ^{[1
]}

Jiang, Taoli ^{[1
]}

Liu, Shuang ^{[1
]}

Chen, Wei ^{[1
]}

机构：

[1] Univ Sci & Technol China, Sch Chem & Mat Sci, Dept Appl Chem, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol Beijing, Natl Ctr Mat Serv Safety, Beijing 100083, Peoples R China

来源：

NANO LETTERS | 2021年 / 21卷 / 20期

关键词：

MnO2-Zn battery; Redox mediator; Bromine; Large-scale energy storage; ENERGY; CHALLENGES; LI;

D O I：

10.1021/acs.nanolett.1c03319

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An aqueous electrolytic MnO2-Zn battery with eye-catching Mn2+/MnO2 cathode chemistry has been attracting immense interest for next-generation energy storage devices due to its irreplaceable advantages. However, the limited MnO2 conductivity restricts its long service life at high areal capacities. Here, we report a high-performance electrolytic MnO2-Zn battery via a bromine redox mediator, to enhance its electrochemical performance. The MnO2/Br-2-Zn battery displays a high discharge voltage of 1.98 V with a capacity of similar to 5.8 mAh cm(-2). It also shows an excellent rate performance of 20 C with a long-term stability of over 600 cycles. Furthermore, the scaled-up MnO2/Br-2-Zn battery with a capacity of similar to 950 mAh exhibits a stable 100 cycles with a practical cell energy density of similar to 32.4 Wh kg(-1) and an attractively low energy cost of below 15 US$ kWh(-1). The design approach can be generalized to other electrodes and battery systems, thus opening up new possibilities for large-scale energy storage.

引用

页码：8863 / 8871

页数：9

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