Γ-Fe2O3 nanoparticles aligned in porous carbon nanofibers towards long life-span lithium ion batteries. (1st November 2018)

• Record Type: Journal Article
• Authors: Chen, Yujie; Zhao, Xiaohui; Liu, Ying; Razzaq, Amir Abdul; Haridas, Anupriya K.; Cho, Kwon-Koo; Peng, Yang; Deng, Zhao; Ahn, Jou-Hyeon
• Is Part Of: Electrochimica acta. Volume 289(2018)
• Page Start: 264
• Page End: 271
• Publication Date: 2018-11-01
• Subjects: γ-Fe2O3 -- Electrospinning -- Porous carbon nanofiber -- Freestanding anode -- Lithium ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.08.088
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: A freestanding γ-Fe2 O3 /carbon nanofiber composite as the anode of lithium ion batteries has been prepared with γ-Fe2 O3 nanoparticles aligned in the tubular channels of the nanofibrous carbon matrix. Innovatively, a large amount of voids are generated for confining a very high active mass content by facilely verifying the ratio of carbon source and the sacrificing pore-forming agent, poly(methyl methacrylate). The best electrochemical performance at an active mass ratio of 70% is obtained with a high discharge capacity of 1088 mAh g −1 retained after 300 cycles at 0.2 C. Good rate capability and long life-span performance are further achieved at 0.5 and 2 C for 600 and 1000 cycles, respectively. In situ X-ray patterns further reveal better exploitation of the active materials for this γ-Fe2 O3 /carbon nanofiber composite electrode. The enhanced electrochemical performance of lithium ion batteries can be ascribed to the well-dispersed γ-Fe2 O3 nanoparticles within the porous carbon matrix, as well as the cross-linked fiber morphology. Consequently, this study provides a superior electrode architecture for constructing flexible anodes of high-performance lithium ion batteries. Graphical abstract: The freestanding γ-Fe2 O3 /carbon nanofiber composite with hierarchical porous structure promotes the development of long life-span lithium ion batteries.