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In Situ Converted Carbon-Coated MnO for Aqueous Zinc-Ion Batteries
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DOI：10.1021/acsaem.6c01037.png)
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Abstract
En 中文
Manganese-based materials have emerged as the most widely used cathode candidates for aqueous zinc-ion batteries, thus gaining extensive attention in related research fields. Nevertheless, it still faces the problems of the dissolution of Mn2+ in the charge−discharge cycles, the facile structural collapse of crystals, and the low kinetic performance of Zn2+ migration. Herein, glucose was used as the carbon source to coat the MnO composite for zinc-ion batteries. The calcination temperatures are investigated to adjust the carbon layer and graphitization degree. This approach effectively inhibits manganese dissolution and boosts the electrochemical performance. The optimized MnO@C-500 sample presented a remarkable specific capacity of 268.5 mAh g−1 at 100 mA g−1 and maintained a capacity of 193.7 mAh g−1 after 200 cycles at 200 mA g−1. The introduced carbon coating effectively improves the electrical conductivity and accelerates the electrochemical kinetics of the electrode.
Keywords:
Batteries
Coating materials
Electrodes
Ions
Transition metals
MnO
carbon coating
cathode
manganese-based materials
zinc ion battery
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5.5
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1.1W
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4.5W
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