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Title: Investigation of Si Anode for LI-ion Batteries
Keywords: Silicon, Li-ion, anode, nanoporous, nanopillar, sputtering
Issue Date: 17-Jan-2013
Citation: OMAMPULIYUR SWAMINATHAN RAJAMOULY (2013-01-17). Investigation of Si Anode for LI-ion Batteries. ScholarBank@NUS Repository.
Abstract: The objective of this study was to investigate the effect of sputtering parameters and nano-structuring on the performance of silicon as an anode for lithium-ion batteries. Though silicon has a high theoretical specific capacity (4200mAh/g), large volume expansion (400%) during lithiation leading to the pulverization of thicker monolithic films limits its use as an anode. Increasing rf sputtering power resulted in higher gravimetric capacity and first cycle Coulombic Efficiency, due to reduced oxygen incorporation. Increased oxygen incorporation helped in enhancing the cycling performance with reduced specific capacity. Nanoporous layers and ordered arrays of nanopillars were fabricated using Metal Assisted Chemical Etching of deposited silicon films. Nanopillars exhibited good cycling performance with a high specific capacity (~4000mAh/g), whereas nanoporous silicon?s cycling performance degraded after few cycles. Both nanoporous layers and nanopillars exhibited good rate performance. Nanopillars outperformed both nanoporous and monolithic layers with respect to areal specific capacity.
Appears in Collections:Ph.D Theses (Open)

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