Plasma-induced ε-MnO2 based aqueous zinc-ion batteries and their dissolution-deposition mechanism. (10th November 2022)

• Record Type: Journal Article
• Authors: Zhang, Le; Yang, Shuhua; Fu, Wenqing; Cui, Yanwei; Wang, Jieqiang; Zhao, Degang; Yang, Chao; Wang, Xiutong; Cao, Bingqiang
• Is Part Of: Journal of materials science & technology. Volume 127(2022)
• Page Start: 206
• Page End: 213
• Publication Date: 2022-11-10
• Subjects: Plasma-induced strategy -- ε-MnO2 -- Oxygen vacancies -- Dissolution/deposition -- Zinc ion batteries; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2022.03.028
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: A novel plasma induced route was developed to prepare oxygen vacancies-rich ε-MnO2- x . Oxygen vacancies can effectively modify the electrochemical performance of ε-MnO2- x . A new dissolution/deposition mechanism for Zn//ε-MnO2- x battery was proposed. Abstract: MnO2 has attracted great interest in working as the cathode of zinc ion batteries. However, the development of high-capacity, high-energy-density, and durable manganese-based cathodes with an easy synthesis strategy and proper energy storage mechanism remains an ongoing challenge. Herein, a facile plasma-induced strategy was demonstrated to introduce oxygen vacancies into the ε-MnO2, and the obtained oxygen vacancies-rich ε-MnO2 nanosheets (ε-MnO2– x ) show satisfactory electrochemical performances. Furthermore, an appropriate energy storage mechanism for dissolution/deposition was proposed. Thanks to a synergistic effect of the oxygen vacancies in ε-MnO2 nanosheets and the exposed free-standing collector for Mn 2+ dissolution/deposition, the ε-MnO2– x nanosheets electrode delivers a remarkable capacity (337 mAh g –1 at 0.1 A g –1 ) and exhibits an ultrahigh energy density of 462 Wh kg –1 (based on the weights of the cathode active material). Furthermore, impressive durability with 85.9% capacity retention after 1000 cycles was obtained. The superior electrochemical performance makes the plasma-induced strategy promising for designing advanced metal oxide electrode materials for high-performance aqueous zinc ion batteries.