A room temperature Na/S battery using a beta '' alumina solid electrolyte separator, tetraethylene glycol dimethyl ether electrolyte, and a S/C composite cathode

作者：Kim Icpyo; Park Jin Young; Kim Chang Hyeon; Park Jin Woo; Ahn Jae Pyoung; Ahn Jou Hyeon; Kim Ki Won; Ahn Hyo Jun^*

来源：Journal of Power Sources, 2016, 301: 332-337.

DOI：10.1016/j.jpowsour.2015.09.120

• Sulfur cathode
• Sulfur/carbon composite
• beta '' alumina
• Solid electrolyte
• Sodium/sulfur battery

To realize a high-performance room temperature Na/S battery with an elemental sulfur cathode, it is important that sodium polysulfides stay within the cathode and that they have room enough to react freely. In this work, sodium polysulfides are confined to the cathode using a beta '' alumina solid electrolyte separator and an optimal amount of tetraethylene glycol dimethyl ether (TEGDME) electrolyte. In addition, an activated carbon material, in the form of a sulfur/carbon (S/C) composite, with high surface area, porosity, and pore volume is employed in the cathode. The resulting Na/S battery shows a high first discharge capacity of 855 mAh g(-1) and coulombic efficiency close to 100%, as well as stable cyclability, with a discharge capacity of 521 mAh g(-1) at the 104th discharge.

• 出版日期2016-1-1