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Mn Valence Regulated Manganese Dioxide Porous Nanoflowers As High-Performance Cathodes at Large Current Densities in Aqueous Magnesium Ions Battery Capacitor

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Document pages: 29 pages

Abstract: The aqueous magnesium ion battery capacitor (AMIBC) is more attractive now as a novel second-generation energy storage system, due to its similar electrochemical characteristics to lithium, low cost and safety properties. In this work, due to the promotion of Faradic reaction contribution by Mn3+ introducing and high capacitive absorption contribution from its high specific surface area, manganese dioxide porous nanoflowers are demonstrated to be a promising cathode material for AMIBC. Sample with 16 Mn3+ Mn can exhibit a high capacity of 260 mAh g-1 at 0.2 A g-1 in 1M MgSO4 electrolytes with greatly improved rate and cycle performance at large current densities. As assembled with active carbon (AC), MnO2 AC device shows a high energy density of 60.8 W h kg-1 at 180 W kg-1 with a cycling stability of 74.1 after 3500 cycles at 2 A g-1.

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