| 초록 |
Lithium-sulfur batteries are receiving enormous interest because of its high theoretical capacity. (1,675mAhg-1) However, their commercialization still hindered by several issues, including short cycle life, low cycling and high self-discharge rate. Moreover, due to the low electrical conductivity and polysulfide dissolution (Li2S2 and Li2S), sulfur-based electrodes are limited its specific discharge capacity. Herein, we report a facile synthesis method for preparing reduced graphene oxide composites containing high sulfur content (up to 80%). With this strategy, we are used to homogeneously mixed the aqueous dispersed sulfur and the GO solution. And then electrode synthesis by using Spray method. Consequently, the electrode shows an initial capacity of 1211mAhg-1 and can retain a reversible capacity of 946mAhg-1 after 100 charge/discharge cycles at 0.1C and the strong covalent bonds between sulfur and rGO that enable to improve efficiency during charge/discharge. |
