Layered Co doped MnO2 with abundant oxygen defects to boost aqueous zinc-ion storage

MengXian Lin; Fuqiang Shao; Yu Tang; Hongjun Lin; Yanchao Xu; Yang Jiao; Jianrong Chen

doi:10.1016/j.jcis.2021.12.136

Layered Co doped MnO₂ with abundant oxygen defects to boost aqueous zinc-ion storage

J Colloid Interface Sci. 2022 Apr:611:662-669. doi: 10.1016/j.jcis.2021.12.136. Epub 2021 Dec 24.

Authors

MengXian Lin¹, Fuqiang Shao¹, Yu Tang¹, Hongjun Lin¹, Yanchao Xu¹, Yang Jiao², Jianrong Chen³

Affiliations

¹ College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
² College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China. Electronic address: yangjiao@zjnu.edu.cn.
³ College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China. Electronic address: cjr@zjnu.cn.

PMID: 34974226
DOI: 10.1016/j.jcis.2021.12.136

Abstract

Zinc Manganese oxide (Zn/MnO₂)-based aqueous battery is favored due to their high specific capacity, security and cost performance. Nevertheless, they usually problems of unstable cyclic structure and slow diffusion kinetics, restricting their practical application. Here, we have successfully synthesized a Co doped MnO₂ cathode material with abundant defects on a carbon cloth substrate. Through a simple hydrothermal method, the Co element can be lightly intercalated in the two-dimensional (2D) layered α-MnO₂ nanowires, inhibiting the structural transformation during the cycle and improve the stability of the material. Meanwhile, plasma technology facilitates the formation of oxygen vacancies in the electrode material, which not only accelerate electron diffusion but also improve the conductivity. Therefore, Zn/Co-MnO₂ battery can reach a specific capacity of 511 mAh g^-1 at 0.5A g^-1 and the retention rate accomplish 98% at high current density. This research puts forward a strategy of element doping and physical preparation of oxygen vacancies, which provides the possibility to develop reversible Zn/MnO₂-based aqueous battery cathode materials with high-performance.

Keywords: Element doping; Oxygen vacancy; Zinc manganese battery.