Dresden 2011 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 31: Postersitzung II
MM 31.4: Poster
Mittwoch, 16. März 2011, 17:15–18:45, P5
Electrochemical analysis of SiNWs anodes in lithium-ion batteries according to the amount of copper deposition — •Gibaek Lee1,2, Gaelle Offranc-Piret3, Fracois Ozanam3, Stefan L. Schweizer2, and Ralf B. Wehrspohn1,2 — 1Fraunhofer Institute for Mechanics of Materials Halle — 2Martin-Luther-University Halle-Wittenberg — 3Ecole Polytechnique, France
It has been known for some time that silicon can incorporate large amounts of Li with a specific capacity of 4200 mAh/g, about a factor of 11 larger than for state of the art graphite anodes. However, silicon and silicon-based negative electrodes exhibit huge volume expansion (ca. 270%) during alloying/de-alloying, resulting in mechanical disintegration of electrode and rapid capacity fading. Addition of inactive but conductive elements into silicon can improve electrical connection of particles and suppress volume change.
In this study, we prepared oriented silicon nanowires (SiNWs) array on n-type silicon substrate by electroless etching in aqueous HF solution containing AgNO3, and then filled in SiNWs, with copper by electrodeposition in aqueous solution. The material characteristics and anodic performance of copper deposited SiNWs anodes have been examined.