Oxygen-Deficient β-MnO2@Graphene Oxide Cathode for High-Rate and Long-Life Aqueous Zinc Ion Batteries
| Autor: | Haocong Yi, Hengyu Ren, Runzhi Qin, Feng Pan, Shunning Li, Mingzheng Zhang, Shouxiang Ding, Lele Liu, Jianjun Fang, Yang Li, Lu Yao, Qinghe Zhao, Wenguang Zhao |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science Oxide chemistry.chemical_element Manganese engineering.material Oxygen defects law.invention chemistry.chemical_compound Coating law Electrical and Electronic Engineering Dissolution Aqueous solution Manganese oxides Graphene Aqueous zinc battery Cathode Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical engineering chemistry Electrode engineering Surface optimization |
| Zdroj: | Nano-Micro Letters, Vol 13, Iss 1, Pp 1-12 (2021) |
| ISSN: | 2150-5551 2311-6706 |
| Popis: | Recent years have witnessed a booming interest in grid-scale electrochemical energy storage, where much attention has been paid to the aqueous zinc ion batteries (AZIBs). Among various cathode materials for AZIBs, manganese oxides have risen to prominence due to their high energy density and low cost. However, sluggish reaction kinetics and poor cycling stability dictate against their practical application. Herein, we demonstrate the combined use of defect engineering and interfacial optimization that can simultaneously promote rate capability and cycling stability of MnO2 cathodes. β-MnO2 with abundant oxygen vacancies (VO) and graphene oxide (GO) wrapping is synthesized, in which VO in the bulk accelerate the charge/discharge kinetics while GO on the surfaces inhibits the Mn dissolution. This electrode shows a sustained reversible capacity of ~ 129.6 mAh g−1 even after 2000 cycles at a current rate of 4C, outperforming the state-of-the-art MnO2-based cathodes. The superior performance can be rationalized by the direct interaction between surface VO and the GO coating layer, as well as the regulation of structural evolution of β-MnO2 during cycling. The combinatorial design scheme in this work offers a practical pathway for obtaining high-rate and long-life cathodes for AZIBs. |
| Databáze: | OpenAIRE |
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