Surface Modification and Electrochemical Performances of Silicon-based Film Anodes for Lithium Ion Batteries
- Surface Modification and Electrochemical Performances of Silicon-based Film Anodes for Lithium Ion Batteries
- 최원창; 김정섭; 변동진; 이중기
- Issue Date
- 221st ECS Meeing
- Figure 1 compares the surface morphology of bare silicon film and porous silicon film with nano-wired structure prepared by chemical etching techniques. As shown in the Fig. 1, well-connected nanowires could be obtained employing chemical etching method, implying that the volume expansion of silicon anodes can be containable during charge-discharge process. We also investigate the surface morphology of electrodes by scanning electron microscopy after first charge-discharge process for the bare and chemically etched silicon anodes. Although the bare silicon film was exfoliated mechanically from current collector even after 1 cycle, chemically etched silicon anodes maintained the well-attached shape with current collector, suggesting that the nano-wired structure can support against the volume expansion of electrodes during cycling. A systematic analysis combined with stress modeling is now going on to reveal the factors influencing on the electrochemical performances of silicon anodes for lithium ion battery.
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