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A Facile Self-saturation Process Enabling the Stable Cycling of a Small Molecule Menaquinone Cathode in Aqueous Zinc Batteries

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Journal Chem Sci
Specialty Chemistry
Date 2024 Oct 14
PMID 39397829
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Abstract

Small quinone molecules are promising cathode materials for aqueous zinc batteries. However, they experience fast capacity decay due to dissolution in electrolytes. Herein, we introduce a simple methyl group to a naphthoquinone (NQ) cathode and demonstrate a facile self-saturation strategy. The methyl group exhibits hydrophobic properties together with light weight and a weak electron-donation effect, which allows a good balance among cycling stability, capacity and voltage for cathode materials. The resulting menadione (Me-NQ) presents around one-third solubility of NQ. The former thus rapidly reaches saturation in the electrolyte during cycling, which suppresses subsequent dissolution. Thanks to this process, the Me-NQ cathode preserves 146 mA h g capacity after 3500 cycles at 5 A g, far exceeding 88 mA h g for NQ. Me-NQ also delivers a stabilized capacity of 316 mA h g at 0.1 A g with only 0.05 V lower average redox voltage than NQ. The co-storage of Zn and H with the redox reactions on the carbonyl sites of Me-NQ is revealed.

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