THICKNESS EFFECT ON THE THREE-DIMENSIONAL SCULPTURED SiCu THIN FILMS USED AS NEGATIVE ELECTRODES IN LITHIUM ION BATTERIES

摘要

SiCu (10 %at. Cu) composite three dimensional sculptured films with different thicknesses have been fabricated by an ion-assisted glancing angle co-deposition technique. The films have been evaluated as anodes considering morphological and structural differences depending on the different evaporation durations. The galvanostatic tests show that after 50~(th) cycles the thin film delivers 2124 mAh g~(-1), but the thick electrode performs 685 mAh g~(-1) as dicharge capacities. It is believed that the thin film electrode has a better electrochemical performance because increase in process time causes deformation in the helice's morphology, increase in ohmic resistance and generation of more stress in the electrode.