Multi-stacked electrodes employing aluminum coated tissue papers and non-oxidized graphene nanoflakes for high performance lithium-sulfur batteries

• Published in: RSC advances 2016-01, Vol.6 (65), p.6537-6545
• Main Authors: Choi, Jin-Hoon, Jung, Ji-Won, Jung, Su-Ho, Choi, Chan Yong, Ryu, Won-Hee, Jo, Sung-Moo, Lim, Dae-Soon, Jeon, Seokwoo, Lee, Hye-Moon, Kim, Il-Doo
• Format: Article
• Language: English
• Subjects: Aluminum; Cathodes; Coating; Electrical resistivity; Electrodes; Graphene; Sulfur
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c6ra08538e

Here, we report a simple approach to Li/S battery cell modification by introducing multi-stacked reactivation layers of 1 st -graphene flakes/2 nd -Al coated tissue paper (GNFs/Al-coated Kimwipes) between a separator and a sulfur cathode. Our unique chemical solution-based coating technique for an Al thin film on catalytically treated fibrous tissue paper offers a cost-effective sulfur electrode with high electrical conductivity, which is well suited to a scaling up of the sulfur electrode. The cathode with the GNFs/Al-coated Kimwipes not only showed excellent rate capability (497.3 mA h g −1 at 2C), but also delivered a high capacity of 715.9 mA h g −1 up to 100 cycles. It also maintained 669.3 mA h g −1 after 200 cycles at 0.2C with negligible capacity degradation, indicating a good capacity retention of 93.5%. Such superior electrochemical performances should be attributed to the finely designed cell configuration: (i) GNFs on the sulfur electrode as a pseudo-upper current collector that directly suppresses the sulfur dissolution; (ii) porous Al-coated Kimwipes with a high electrical conductivity (∼0.7 Ω −1 ) as a main reservoir which reversibly captures and reutilizes the sulfur species. The proposed concept of the sulfur electrode can give an applicable solution for advanced Li/S batteries. Here, we report a simple approach to Li/S battery cell modification by introducing multi-stacked reactivation layers of 1 st -graphene flakes/2 nd -Al coated tissue paper (GNFs/Al-coated Kimwipes) between a separator and a sulfur cathode.