Electrochemical Characterization and Interfacial Chemistry of Tin-Based Anode Materials for Mg-Ion Batteries

Abstract

Magnesium-ion batteries have received a particular attention as one of the beyond-lithium ion batteries for next-generation energy storage system applications. Magnesium is earth abundant and low cost compared to lithium, and environment-friendly, and provides higher theoretical volumetric capacity (3833 mAhcm-3) than lithium.1 The use of magnesium metal anode is often limited due to the formation of surface blocking layer in conventional electrolyte such as magnesium salts (TFSI-, ClO4 -, BH4 -) in ether-based solvents. To overcome these problems, recently insertion-type materials such as Sn, Sb, Pb and Bi, which is based on the alloy reaction with magnesium, have been proposed as a new class of anode materials for magnesium-ion batteries.2,3 However, studies on the materials’ intrinsic electrochemical characteristics and the interfacial chemistry between alloy anode and electrolyte are yet to be reported. In the present study, we have investigated on the electrochemical and interfacial reaction behavior of tin-based anode materials in magnesium cells. Changes with cycling in their structure, surface property and particle morphology would be discussed in the meeting. Acknowledgements This work was supported by National Research Foundation of Korea (2015062107).