High-loading Fe2O3/SWNT composite films for lithium-ion battery applications. (25th July 2017)

• Record Type: Journal Article
• Authors: Wang, Ying; Guo, Jiahui; Li, Li; Ge, Yali; Li, Baojun; Zhang, Yingjiu; Shang, Yuanyuan; Cao, Anyuan
• Is Part Of: Nanotechnology. Volume 28:Number 34(2017)
• Publication Date: 2017-07-25
• Subjects: carbon nanotubes -- high-loading -- Fe2O3 -- residual catalyst -- lithium ion battery; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/aa7a81
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Single-walled carbon nanotube (SWNT) films are a potential candidate as porous conductive electrodes for energy conversion and storage; tailoring the loading and distribution of active materials grafted on SWNTs is critical for achieving maximum performance. Here, we show that as-synthesized SWNT samples containing residual Fe catalyst can be directly converted to Fe2 O3 /SWNT composite films by thermal annealing in air. The mass loading of Fe2 O3 nanoparticles is tunable from 63 wt% up to 96 wt%, depending on the annealing temperature (from 450 °C to 600 °C), while maintaining the porous network structure. Interconnected SWNT networks containing high-loading active oxides lead to synergistic effect as an anode material for lithium ion batteries. The performance is improved consistently with increasing Fe2 O3 loading. As a result, our Fe2 O3 /SWNT composite films exhibit a high reversible capacity (1007.1 mA h g −1 at a current density of 200 mA g −1 ), excellent rate capability (384.9 mA h g −1 at 5 A g −1 ) and stable cycling performance with the discharge capacity up to 567.1 mA h g −1 after 600 cycles at 2 A g −1 . The high-loading Fe2 O3 /SWNT composite films have potential applications as nanostructured electrodes for various energy devices such as supercapacitors and Li-ion batteries.