Highly integrated and interconnected CNT hybrid nanofibers decorated with α-iron oxide as freestanding anodes for flexible lithium polymer batteries. Issue 20 (10th April 2019)

• Record Type: Journal Article
• Authors: Oh, Se Hwan; Kwon, O Hyeon; Kang, Yun Chan; Kim, Jae-Kwang; Cho, Jung Sang
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 20(2019)
• Page Start: 12480
• Page End: 12488
• Publication Date: 2019-04-10
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta01374a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Highly integrated and interconnected CNT hybrid nanofibers decorated with α-iron oxide are prepared. The formation mechanism of the unique nanostructure is investigated, and their flexible Li + ion storage properties as anode materials and the full-cell properties are studied in detail. Abstract : Highly integrated and interconnected carbon nanotube (CNT) hybrid nanofibers decorated with α-Fe2 O3 (denoted hereafter as HI-CNT/Fe2 O3 nanofibers) were first introduced for potential use as freestanding anodes in flexible lithium polymer batteries. CNTs were modified to have a carboxyl group attached. Polyacrylonitrile (PAN) was also hydrolyzed, forming sulfonated polyacrylamide. Dipole–dipole interactions and hydrogen bonding between CNTs and PAN can form Fe(acac)3 –PAN–CNT complexes, thus allowing for the formation of highly integrated CNTs in a stable jet without being aggregated during electrospinning. The discharge capacity of a freestanding HI-CNT/Fe2 O3 nanofiber anode after 100 cycles at 100 mA g −1 was 651 mA h g −1 . The specific capacity of a flexible full-cell combined with a LiFePO4 cathode was maintained at 148.5 mA h g −1 (cathode-based) even after bending for 10 cycles as compared with 148.9 mA h g −1 before bending.