Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6616862 | Electrochimica Acta | 2013 | 7 Pages |
Abstract
Deeply fluorinated multi-wall carbon nanotubes (F-MWCNTs) with different diameters are prepared using the mixture of fluorine/nitrogen gas, and the molar ratio of fluorine to carbon is controlled to be approximate to 1. The electrochemical performances of F-MWCNTs are tested as the cathode material in primary lithium battery. The discharge rate of 4 C can be applied for these F-MWCNTs and F-MWCNTs with average diameter larger than 50 nm can support the high discharge rate up to 5C delivering a maximum power density of 7114.1 W kgâ1, associated with a high 1923 Wh kgâ1 energy density. The conductive networks of intimately contacting MWCNTs in nano-scale and the intrinsic fast rate capability of one-dimensional nanostructures account for the high power density of F-MWCNTs. Moreover, F-MWCNTs with larger diameter exhibits better electrochemical performances. Based on the pore size distribution and impedance results, it is proposed that the F-MWCNTs with larger diameters can effectively avoid the surface and networks of F-MWCNTs being blocked by the enlarged LiF crystals, and hence display the better electrochemical performances.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Yu Li, Yiyu Feng, Wei Feng,