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Lee, Kyu Tae
Electrochemical Energy Systems Laboratory
Research Interests
  • Electrode materials for Li-ion batteries
  • Na-ion & Mg-ion batteries
  • Li-Air & Li-Sulur batteries
  • Design of advanced materials with new crystal structures
  • Fundamental electrochemistry & solid state chemistry

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Improvement of silicon powder negative electrodes by copper electroless deposition for lithium secondary batteries

Cited 81 times inthomson ciCited 73 times inthomson ci
Title
Improvement of silicon powder negative electrodes by copper electroless deposition for lithium secondary batteries
Author
Kim, JWRyu, JHLee, Kyu TaeOh, SM
Keywords
Annealing; Copper electroless deposition; Cycle performance; Galvanostatic intermittent titration; Lithium secondary battery; Silicon powder anode
Issue Date
2005-09
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.147, no.1-2, pp.227 - 233
Abstract
in order to enhance the electrical conductivity of Si powder, which shows a poor cycleabilty as the anode in lithium secondary batteries due to low electrical conductivity and a severe volume change on cycling, Cu is deposited on the Si surface by a electroless deposition method. As Cu deposition on bare Si powder is found to be unsatisfactory, Si powder is etched to roughen the surface, on to which a large amount of Cu deposit with a uniform coverage is obtained. The resulting anode material exhibits improved cycle performance as a result of conductivity enhancement. The long-term cycleability is, however, still unsatisfactory due to detachment of Cu from the Si surface that is caused by a severe volume change of the Si particles on cycling. The detachment of Cu is greatly suppressed by annealing at 400 degrees C in an inert atmosphere and, thereby, delivers better cycle performance. The improvement in interfacial stability exhibited by the annealed samples is ascribed to the formation of a Cu3Si alloy phase at the interface and diffusion of Cu atoms into the Si particles.
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DOI
10.1016/j.jpowsour.2004.12.041
ISSN
0378-7753
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ECHE_Journal Papers
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