Free stansing silicon/cnts coaxial nanowires composite film for use as lithium ion battery anode materials

• Main Author: Muhammad Nur Aslany Rahim.
• Other Authors: Zhang Qing
• Format: Final Year Project
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Microelectronics
• Online Access: http://hdl.handle.net/10356/52998
• Institution: Nanyang Technological University

Batteries come in different shapes and sizes. Their capacity also differs. Some may charge and discharge longer, while others may charge at a faster rate. There are also types of batteries that cannot be charge or discharge. One of the key parameters in fabricating a high capacity lithium ion battery is the materials that are used for the anode. Researchers have shown that Silicon can produce charge capacity up to 4200 mAh/g but face a serious capacity fade when using bulk silicon by itself resulting from structural pulverization by volume changes during lithiation/delithiation. Attentions have been shifted to the usage of Si nanostructure and amorphous silicon (a-Si) composite, for example, Si/CNTs or Si/grapheme composite as the anode material. In this study, freestanding Si/CNTs coaxial nanofibers composite film is fabricated. First, carbon nanotubes (CNTs) will be grown onto the stainless steel, and then followed by deposition of silicon onto the CNTs to form a freestanding Si/CNTs coaxial nanofibers composite film anode. Components of a battery are then assembled in the glove box. Characterization tests are conducted. SEM images are captured and CV profiling, rate capability and charge/discharge capacities are plotted and analyzed.