Nanocomposite polymer electrolyte for rechargeable magnesium batteries

TitleNanocomposite polymer electrolyte for rechargeable magnesium batteries
Publication TypeJournal Article
Year of Publication2015
AuthorsYuyan Shao, Nav Nidhi Rajput, Jianzhi Hu, Mary Hu, Tianbiao Liu, Zhehao Wei, Meng Gu, Xuchu Deng, Suochang Xu, Kee Sung Han, Jiulin Wang, Zimin Nie, Guosheng Li, Kevin R. Zavadil, Jie Xiao, Chongmin Wang, Wesley A. Henderson, Ji-Guang Zhang, Yong Wang, Karl T. Mueller, Kristin A. Persson, Jun Liu
JournalNano Energy
Date Published03/2015
ISBN Number22112855

Nanocomposite polymer electrolytes present new opportunities for rechargeable magnesium batteries. However, few polymer electrolytes have demonstrated reversible Mg deposition/dissolution and those that have still contain volatile liquids such as tetrahydrofuran (THF). In this work, we report a nanocomposite polymer electrolyte based on poly(ethylene oxide) (PEO), Mg(BH4)2 and MgO nanoparticles for rechargeable Mg batteries. Cells with this electrolyte have a high coulombic efficiency of 98% for Mg plating/stripping and a high cycling stability. Through combined experiment-modeling investigations, a correlation between improved solvation of the salt and solvent chain length, chelation and oxygen denticity is established. Following the same trend, the nanocomposite polymer electrolyte is inferred to enhance the dissociation of the salt Mg(BH4)2 and thus improve the electrochemical performance. The insights and design metrics thus obtained may be used in nanocomposite electrolytes for other multivalent systems.