Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 10, Issue 1, Pages 25-31Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.10.025
Keywords
Sn-based negative electrodes; lithium-ion batteries; alloy negative electrodes; mechanical attrition; sputtering; high energy ball milling
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High energy ball milling, vertical-axis attritor milling and co-sputtering were used to prepare Sn30Co30C40 or Sn36Co41C23 electrode materials. By varying the milling conditions, it was possible to obtain nanostructured materials by mechanical methods whose X-ray diffraction patterns mimicked the diffraction pattern of the co-sputtered material. Electrochemical testing showed that composite electrodes made from each of the prepared materials showed stable charge-discharge capacity for at least 100 charge-discharge cycles and stable differential capacity versus potential profiles. Although the materials appear to be similarly nanostructured, the sputtered material showed a reversible capacity near 610 mA h/g, close to the theoretical capacity of 661 mA h/g, while the best material prepared by mechanical methods attained a specific capacity near 470 mA h/g. Further experiments are required to understand the differences in the nanostructure of these materials that leads to the differences in attained specific capacity. (C) 2007 Elsevier B.V. All rights reserved.
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