Low-Cost, Dendrite-Blocking Polymer-Sb2O3 Separators for Lithium and Sodium Batteries

by Younes Ansari, Bingkun Guo, Joon Hee Cho, Kyusung Park, Jie Song, Christopher J. Ellison and John B. Goodenough

Journal of the Electrochemical Society 2014 161 (10), A1655-A1661

We describe here preparation and performance of an ultra-flexible and low-cost Sb2O3/polymer composite membrane separator for Na-ion or Li-ion batteries operating with metallic Na or Li anodes. The separator has a large electrolyte window, excellent thermal and mechanical stabilities when infused with EC/DEC/AClO(4) (1M) electrolyte (A = Li or Na), excellent wettability and acceptable ionic conductivity to 1C rate. The ability of the separator to block anode dendrites from crossing it is demonstrated in symmetric alkali-metal cells and in the performances of Na-ion and Li-ion cells with/without loading with Sb2O3. (C) 2014 The Electrochemical Society. All rights reserved.

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