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Electrochemical Study of Polymorphic MnO2 in Rechargeable Aqueous Zinc Batteries

Authors :
Kun You
Yifei Yuan
Xiuxian Liao
Wenjun Song
Xuedong He
Huile Jin
Shun Wang
Source :
Crystals, Vol 12, Iss 11, p 1600 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

Manganese dioxide is regarded as a promising energy functional material due to its open tunnel structure with enormous applications in energy storage and catalysis. In this paper, α-MnO2 with a 2 × 2 tunnel structure and β-MnO2 with a 1 × 1 tunnel structure were hydrothermally synthesized, which possess characteristic tunnel structures formed by the interconnected unit structure of [MnO6] octahedrons. With regards to their different tunnel dimensions, the specific mechanism of ion intercalation in these two phases and the effect on their performance as aqueous Zn-MnO2 battery cathodes are explored and compared. Comprehensive analyses illustrate that both α-MnO2 and β-MnO2 provide decent capacity in the aqueous battery system, but their intrinsic stability is poor due to the structural instability upon cycling. At the same time, experiments show that α-MnO2 has a better rate performance than β-MnO2 under larger currents, thus implying that the former has a broader application in this aqueous battery system.

Details

Language :
English
ISSN :
12111600 and 20734352
Volume :
12
Issue :
11
Database :
Directory of Open Access Journals
Journal :
Crystals
Publication Type :
Academic Journal
Accession number :
edsdoj.1c5f86f417d741718b9869baa83f6fef
Document Type :
article
Full Text :
https://doi.org/10.3390/cryst12111600