Influences of Ti film thickness on electrochemical properties of Si/Ti/Cu film electrodes.
J Nanosci Nanotechnol
; 12(7): 5962-6, 2012 Jul.
Article
em En
| MEDLINE
| ID: mdl-22966689
ABSTRACT
Si and Si/Ti films were fabricated on a Cu current collector (substrate) using the DC sputtering system. The Ti film as a buffer layer was inserted between the Si film and the Cu current collector. Their structural and electrochemical properties were investigated with various Ti film thicknesses of 20-90 nm. The Si and Ti films deposited on a polycrystalline Cu substrate were amorphous. The Si/Ti/Cu film electrode exhibited better electrochemical properties than the Si/Cu electrode in terms of capacity, charge-discharge efficiency, and cycleability. In the Si/Ti/Cu electrode, the film electrode with a 55 nm Ti film thickness showed the best electrochemical properties 367 microA h/cm2 initial capacity, 91% efficiency, and 50% capacity retention after 100 cycles. These good electrochemical properties are attributed to the enhanced adhesion between the Si and Ti films. Additionally, the modified surface morphology of Si film with a cluster structure could withstand the lateral volume change during the charge-discharge process.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
J Nanosci Nanotechnol
Ano de publicação:
2012
Tipo de documento:
Article