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Magnesium/sulfur battery (Mg/S) has recently received wide attention due to its high theoretical energy density (3,260 Wh/L) and low cost. To further improve its safety and flexibility, developing a polymer electrolyte that can be compatible with both electrophilic S and Mg is critical. Here, we report a magnesium chloride-(fluorinated tetraethylene glycolic)borate (MgCl-FTGB) based non-nucleophilic, gel-type polymer electrolyte for Mg/S battery via a facile synthetic method through commercially available reagents. This electrolyte coupled with glass fiber allows reversible Mg deposition/dissolution (100% coulombic efficiency) with low polarization (500 μA/cm2, 300/300 mV), and shows a wide electrochemical window of 4.8 V (vs. Mg/Mg2+). Mg/S battery assembled with this electrolyte can cycle over 50 times with a high specific discharge capacity retention of over 1,100 mAh/g.
This work was supported by the National Natural Science Foundation of China (Nos. 21433013 and NSFCU1832218), the National Key Research and Development Program of China (No. 2016YFB0100100), the International Partnership Program of Chinese Academy of Sciences (Nos. 121E32KYSB20150004), the CAS-Queensland Collaborative Science Fund (No. 121E32KYSB20160032) and the Users with Excellence Project of Heifei Science Center CAS (No. 2018HSC-UE005).