Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8001563 | Journal of Alloys and Compounds | 2014 | 19 Pages |
Abstract
The novel binary SixSb immiscible alloy was synthesized using chemical reduction-mechanical alloying methods and first investigated as possible anodes for lithium ion batteries. The microstructures, morphologies and electrochemical properties were investigated utilizing X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), constant-current charge/discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy (EIS). Results showed that tiny Si particles were dispersed homogeneously in Sb active matrix. Cyclic voltammetry results indicated that the Li+-transport rates were significantly enhanced in the SixSb immiscible alloy. Results also showed that the Si0.8Sb exhibited the best cyclability with a reversible capacity of 596.4 mAh gâ1 after 50 cycles. The cyclability can be improved by restricting either the upper or lower cutoff voltage, which can control the lithiation/delithiation degree and prevented the powdering and shredding of the active materials after Li+ trapped into electrode materials.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jingwei Wang, Yang Wang, Peixin Zhang, Dongyun Zhang, Xiangzhong Ren,