Understanding the Electrochemical Mechanism of K-αMnO2 for Magnesium Battery Cathodes
ACS Applied Materials & Interfaces2014Vol. 6(10), pp. 7004–7008
Citations Over TimeTop 10% of 2014 papers
Timothy S. Arthur, Ruigang Zhang, Chen Ling, Per‐Anders Glans, Xudong Fan, Jinghua Guo, Fuminori Mizuno
Abstract
Batteries based on magnesium are an interesting alternative to current state-of-the-art lithium-ion systems; however, high-energy-density cathodes are needed for further development. Here we utilize TEM, EDS, and EELS in addition to soft-XAS to determine electrochemical magnesiation mechanism of a high-energy density cathode, K-αMnO2. Rather than following the typical insertion mechanism similar to Li(+), we propose the gradual reduction of K-αMnO2 to form Mn2O3 then MnO at the interface of the cathode and electrolyte, finally resulting in the formation of K-αMnO2@(Mg,Mn)O core-shell product after discharge of the battery. Understanding the mechanism is a vital guide for future magnesium battery cathodes.
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