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Date of Publication:2018-01-01

Journal:中国有色金属学报

Volume:28

Issue:7

Page Number:1361-1370

ISSN No.:1004-0609

Abstract:Al-Fe and Al-Fe-C nanocomposite particles were prepared through DC arc-discharge method under a methane atmosphere with micro-sized aluminium and iron powders as the raw materials. The formation mechanism, structures, morphologies and electrochemical performances of the nanoparticles�?samples were studied. The effects of carbon atoms on the composition, phase structure and electrochemical properties were studied, and the formation mechanism of nanoparticles as well as electrochemical intercalation/deintercalation of lithium ions were also discussed. The results indicate that the Al-Fe particles prepared in a carbon-free atmosphere are spherical in shapes, meanwhile, the carbon-containing atmosphere causes the morphology of particles columnar or linear, the composition changes from Al to Al4C3 and from FeAl2 to Fe2Al5 in Al-Fe-C nanocomposite particles. The first discharge capacities of four kinds of nanoparticles�?electrodes are 348.8, 193.3, 275.5 and 628.8 mAh/g, under the current density of 100 mA/g, respectively. The presence of intermetallic Fe2Al5 in the powders favors to improve the capacities and restrain the volume changes during the intercalation/deintercalation of lithium ions, thus the cycle stability of electrode was greatly enhanced. © 2018, Science Press. All right reserved.

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