4.7 Article

Alkali ions pre-intercalation of δ-MnO2 nanosheets for high-capacity and stable Zn-ion battery

Journal

MATERIALS TODAY ENERGY
Volume 24, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2021.100934

Keywords

Zinc ion batteries; Delta-MnO2; Cathode stability; Energy storage

Funding

  1. National Science Foundation of China [21576054]
  2. Guangdong Provincial Key Laboratory of Plant Resources Biorefinery [2021B121204011]
  3. Natural Science Foundation of Guangdong Province [2019B1515120087]

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This study investigates the effect of alkali cations on the electrochemical behavior and charge storage mechanism of delta-MnO2 cathode in aqueous zinc-ion batteries. Preintercalating various alkali cations into delta-MnO2 nanosheets enhances the cycling stability, rate capability, and reversibility. The increase in pre-intercalated ion radius improves the performance.
Manganese oxide is regarded as the most promising cathode material for aqueous zinc-ion batteries (ZIBs). However, the practical application of Mn-based ZIBs has been restricted by slow diffusion kinetics of Zn ions and unstable structure of MnO2. Herein, delta-MnO2 nanosheets with a layered structure are preintercalated with various alkali cations (X-delta-MnO2, X = Li+, Na+, or K+) and are designed for ZIBs to understand the effect of cations on the electrochemical behavior and charge storage mechanism of the delta-MnO2 cathode. It demonstrates that the cycling stability, the rate capability, and the reversibility of X-delta-MnO2 are improved with the sequence of K-delta-MnO2 > Na-delta-MnO2 > Li-delta-MnO2 owing to the increase of pre-intercalated ion radius. Furthermore, Hthorn intercalation followed by Zn2+ mechanism has been verified by observation of the two distinct voltage platforms with a reversible deposition/dissolution of Zn4SO4(OH)(6)center dot 4H(2)O. This study confirms that the pre-intercalation of the alkali cation is an efficient strategy to improve the energy storage performance and to understand the charge-discharge mechanism of delta-MnO2 for ZIBs. (c) 2022 Elsevier Ltd. All rights reserved.

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