Carbon Nanotube-Loaded Electrospun LiFePO4/Carbon Composite Nanofibers As Stable and Binder-Free Cathodes for Rechargeable Lithium-Ion Batteries

详细信息    查看全文

• 作者：Ozan Toprakci ; Hatice A.K. Toprakci ; Liwen Ji ; Guanjie Xu ; Zhan Lin ; Xiangwu Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：March 28, 2012
• 年：2012
• 卷：4
• 期：3
• 页码：1273-1280
• 全文大小：528K
• 年卷期：v.4,no.3(March 28, 2012)
• ISSN：1944-8252

文摘

LiFePO₄/CNT/C composite nanofibers were synthesized by using a combination of electrospinning and sol鈥揼el techniques. Polyacrylonitrile (PAN) was used as the electrospinning media and carbon source. Functionalized CNTs were used to increase the conductivity of the composite. LiFePO₄ precursor materials, PAN and functionalized CNTs were dissolved or dispersed in N,N鈥揹imethylformamide separately and they were mixed before electrospinning. LiFePO₄ precursor/CNT/PAN composite nanofibers were then heat-treated to obtain LiFePO₄/CNT/C composite nanofibers. Fourier transform infrared spectroscopy measurements were done to demonstrate the functionalization of CNTs. The structure of LiFePO₄/CNT/C composite nanofibers was determined by X鈥搑ay diffraction analysis. The surface morphology and microstructure of LiFePO₄/CNT/C composite nanofibers were characterized using scanning electron microscopy and transmission electron microscopy. Electrochemical performance of LiFePO₄/CNT/C composite nanofibers was evaluated in coin-type cells. Functionalized CNTs were found to be well-dispersed in the carbonaceous matrix and increased the electrochemical performance of the composite nanofibers. As a result, cells using LiFePO₄/CNT/C composite nanofibers have good performance, in terms of large capacity, extended cycle life, and good rate capability.

Keywords:

lithium-ion batteries; cathodes; LiFePO₄; carbon nanofibers; carbon nanotubes