Synthesis of Manganous Oxide and Its Electrochemical Properties for Magnesium Storage
ZHU Jiajia1, HUANG Bin1, LI Yanwei1, CHEN Quanqi1, LI Qingkui2, YANG Jianwen1
1 College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004 2 College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001
Abstract: Anode material for magnesium ion battery is rarely studied. Aiming at investigating the preparation parameters and magnesium storage properties of manganous oxide as negative electrode material for magnesium ion battery, the manganous oxide was prepared by oxalate pyrolysis, and the effects of temperature, particle size and morphology on the electrochemical properties of magnesium storage were preliminarily analyzed by TG, XRD, SEM and electrochemical measurements in this study. The results showed that the manganous oxide with face-centered cubic structure could be obtained by pyrolysis of manganese oxalate over 400 ℃, clear pseudocapacitor characterization of manganous oxide anode materials could be found in Mg (AlCl2EtBu)2/THF electrolyte. With increasing preparation temperature, the primary particles grew from nanometer size to crystal with particle size of 500 nm to 2 μm, which resulted in the drop of specific capacity. The nano-manganous oxide (particle size of about 30—50 nm) prepared at 400 ℃ exhibited more notable battery characteristics than other samples, with the initial specific capacity of about 39.6 mAh·g-1, and the cyclic specific capacity of 19.0 mAh·g-1 after 50 charging and discharging cycles. The electrochemical properties of manganous oxide for magnesium storage can be enhanced by nanocrystllization, improving electronic conductivity and optimizing surface properties.
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2019, Vol. 33 
