Experimental design and theoretical calculation for sulfur-doped carbon nanofibers as a high performance sodium-ion battery anode. Issue 17 (15th April 2019)

• Record Type: Journal Article
• Authors: Jin, Qianzheng; Li, Wei; Wang, Kangli; Feng, Pingyuan; Li, Haomiao; Gu, Tiantian; Zhou, Min; Wang, Wei; Cheng, Shijie; Jiang, Kai
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 17(2019)
• Page Start: 10239
• Page End: 10245
• Publication Date: 2019-04-15
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta02107h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : S-doped carbon nanofibers derived from bacterial cellulose with interlinked networks and pores were facilely prepared in a sustainable approach. This product presents a high Na-ion storage capacity and excellent rate performances. Abstract : Hard carbon is one of the most promising anode materials for sodium ion batteries (SIBs) due to its low cost, high conductivity and suitable potential; however, its application is hindered by its relatively low capacity, and unsatisfactory rate capability and cyclability. Herein, we have reported a high performance SIB anode of S-doped interconnected carbon nanofibers (denoted as S-CNFs) that was directly derived from the industrial waste product bacterial cellulose, demonstrating great potential for practical application and sustainable development. The S-CNFs present high reversible capacities of 460 mA h g −1 at 0.05 A g −1 and 255 mA h g −1 at 10 A g −1, and preserved a capacity of 310 mA h g −1 at 1 A g −1 after 1100 cycles. Structural and electrochemical analyses revealed that multiple factors including the expanded (002) interlayer spacing, the electrochemically active –C–S–C– covalent bonds, the capacitive process induced by a large surface area and considerable defects as well as the stable structure associated with the cross-linked network contributed to their excellent performance. Furthermore, the first principles evaluations confirmed the sodium-storage mechanism of sulfur doping, which not only improved the interlayer distance for the mobility of Na + but also promoted the electronegativity as well as the electrochemical activity and increased the adsorption of Na + .