標題: | High-performance graphene/sulphur electrodes for flexible Li-ion batteries using the low-temperature spraying method |
作者: | Kumar, Pushpendra Wu, Feng-Yu Hu, Lung-Hao Abbas, Syed Ali Ming, Jun Lin, Chia-Nan Fang, Jason Chu, Chih-Wei Li, Lain-Jong 電子物理學系 Department of Electrophysics |
公開日期: | 1-一月-2015 |
摘要: | Elementary sulphur (S) has been shown to be an excellent cathode material in energy storage devices such as Li-S batteries owing to its very high capacity. The major challenges associated with the sulphur cathodes are structural degradation, poor cycling performance and instability of the solid-electrolyte interphase caused by the dissolution of polysulfides during cycling. Tremendous efforts made by others have demonstrated that encapsulation of S materials improves their cycling performance. To make this approach practical for large scale applications, the use of low-cost technology and materials has become a crucial and new focus of S-based Li-ion batteries. Herein, we propose to use a low temperature spraying process to fabricate graphene/S electrode material, where the ink is composed of graphene flakes and the micron-sized S particles prepared by grinding of low-cost S powders. The S particles are found to be well hosted by highly conductive graphene flakes and consequently superior cyclability (similar to 70% capacity retention after 250 cycles), good coulombic efficiency (similar to 98%) and high capacity (similar to 1500 mA h g(-1)) are obtained. The proposed approach does not require high temperature annealing or baking; hence, another great advantage is to make flexible Li-ion batteries. We have also demonstrated two types of flexible batteries using sprayed graphene/S electrodes. |
URI: | http://dx.doi.org/10.1039/c5nr00885a http://hdl.handle.net/11536/124724 |
ISSN: | 2040-3364 |
DOI: | 10.1039/c5nr00885a |
期刊: | NANOSCALE |
Issue: | 17 |
起始頁: | 8093 |
結束頁: | 8100 |
顯示於類別: | 期刊論文 |