Interface Engineering of Aqueous Zinc/Manganese Dioxide Batteries with High Areal Capacity and Energy Density

作者：Shen, Zhaoxi; Liu, Yu; Luo, Lei; Pu, Jun; Ji, Yu; Xie, Junpeng; Li, Linsen; Li, Chaowei; Yao, Yagang^*; Hong, Guo^*

来源：Small, 2022, 18(50).

DOI：10.1002/smll.202204683

• advanced cathodes
• high areal capacity
• high mass loading
• interface engineering
• Zn
• MnO
• (2) batteries

Commercialization of aqueous batteries is mainly hampered by their low energy density, owing to the low mass loading of active cathode materials. In this work, a MnO2 cathode structure (MnO2/CTF) is designed to modify the MnO2/collector interface for enhanced ion transportation properties. Such a cathode can achieve ultrahigh mass loading of MnO2, large areal capacity, and high energy density, with excellent cycling stability and rate performance. Specifically, a 0.15 mm thick MnO2/CTF cathode can realize a mass loading of 20 mg cm(-2) with almost 100% electrochemical conversion of MnO2, providing the maximum areal capacity of 12.08 mA h cm(-2) and energy density of 191 W h kg(-1) for Zn-MnO2/CTF batteries when considering both cathode and anode. Besides the conventional low energy demonstrations, such a Zn-MnO2/CTF battery is capable of realistic applications, such as mobile phones in our daily life, which is a promising alternative for wearable electronics.

• 单位
  南开大学; 中国科学院; 南京大学