Introduction
The Li/S battery is a very attractive candidate for rechargeable lithium batteries due to its high theoretical
specific capacity of 1672 mAh/g and theoretical energy density of 2600 Wh/kg based on sulfur active material.
Moreover, utilization of sulfur is advantageous because of its lowcost and nontoxicity.1,2 The reduction process of Li/S battery with ether-based electrolyte could be divided into two regions based on the voltage profile;3,4 these are the first discharge region in the range of 2.4-2.1 Vand the second discharge region in the range of 2.1-1.5V. The discharge curve of cell was similar as that using tetrohydrofuran (THF)-based electrolyte5. Most of Li-ion battery used carbonate-based electrolytes such as mixed ethylene carbonate(EC) and dimethylene carbonate (DMC) or propylene carbonate (PC) and DMC. However, electrochemical properties of Li/S cell and change of sulfur electrode with carbonate-based electrolyte have not been studied. In order to study electrochemical properties of Li/S batteries with various electrolytes such as ether-based system and carbonate-based system, we investigated the discharge curves, cycle properties and changes of sulfur electrode.
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