Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7737702 | Journal of Power Sources | 2014 | 10 Pages |
Abstract
Hollow prismatic/cylindric iron fluoride with a wall thickness of 0.1-0.5 μm and a length of 1-3 μm has been synthesized by a simple and mild solvothermal method. This compound with a mixed crystal structure of FeF3·3H2O and FeF3·0.33H2O, has an initial discharge capacities of 106.7 mAh gâ1 and a capacity retention of 60% after 100 cycles at the rate of 0.5C (1 C is 237 mA gâ1) in the voltage of 2.0-4.5 V. To overcome the poor electronic conductivity of fluorides, the as-prepared iron fluoride has been ball-milled with 15 wt.% acetylene black (AB) and heat-treated to obtain FeF3·0.33H2O/C nanocomposites. The nanocomposites deliver discharge capacity of 160.2 mAh gâ1 at the rate of 0.5C. Even at the high rate of 5 C, the initial discharge capacity is still as high as 137.5 mAh gâ1. The capacity retentions reach up to 85.0% and 75.7% after 100 cycles at 0.5 C and 5 C, respectively.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jinli Tan, Li Liu, Hai Hu, Zhenhua Yang, Haipeng Guo, Qiliang Wei, Xin Yi, Zichao Yan, Qian Zhou, Zhifeng Huang, Hongbo Shu, Xiukang Yang, Xianyou Wang,