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Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-12-14T18:11:01Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 3 Verma_Ankit.docx: 25902052 bytes, checksum: 29ce28249278f74b2862021866fa71c1 (MD5) Verma_Ankit.pdf: 3510116 bytes, checksum: ba1002deac2fc672dbdfa31484fbc6eb (MD5) Verma_Ankit.pdf: 13435528 bytes, checksum: 5104f41f7949ab09cc14b567e0867335 (MD5) Made available in DSpace on 2013-02-03T19:16:48Z (GMT). No. of bitstreams: 3 Ankit_Verma.pdf: 3511629 bytes, checksum: 2b8b8fb71264f7e554f698c33db561b2 (MD5) Verma_Ankit.docx: 25898354 bytes, checksum: 59f5b49e84639696b4973ef7f27bf698 (MD5) license.txt: 4060 bytes, checksum: 0f6a5c751b57c947eef2ec395dc5de6f (MD5) Restriction data tranferred 2014-07-01T11:11:51-05:00 Original Data Group with Access UIUC Users [automated] Release Date: 2015-02-03 13:18:53 UTC Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Chasiotis, Ioannis Verma, Ankit 2013-02-03T19:16:48Z 2013-02-03T19:16:48Z 2015-02-03T11:00:38Z 2012-12 2012-12 2012-12 Electrochemical studies were conducted on thin-film composite silicon (Si) and tin (Sn) anodes and lithium cobalt oxide (LCO) structural cathodes for lithium ion (Li+) batteries. The composite electrodes were fabricated in the form of slurry with PVDF and carbon black as the matrix and the conductive agent, respectively, and were deposited and solidified on a copper (Cu) current collector. The interlaminar shear strength between the composite Si anode and the Cu current collector was found to be 1.27±0.75 MPa. The mechanical integrity of Si and Sn composite anodes was evaluated by cyclic lithiation/delithiation tests under galvanostatic and potentiostatic conditions. The charge rate (C/7 and C/30) and the Sn particle size (2-45 μm) were varied in the experiments. The anode surface was evaluated via post-mortem confocal laser imaging and scanning electron microscopy. It was found that a critical particle size of 5-8 µm dictated the onset of particle fracture and was independent of the charge rates used in this study. Compared to large particles, small Sn particles (<10 μm) resulted in higher initial discharge capacities, reaching up to 75% of the theoretical capacity. On the other hand, a fourfold reduction in charge rate increased the initial discharge capacity and improved on the capacity retention of large Sn particles that reached the capacity levels of small Sn particles. This low charge rate limited the formation of surface residue during electro-chemical testing, which contributed to the improved electrode performance. Finally, a complete solid-state battery was made from porous LCO and nickel-doped lithium titanate (Li4Ti5O12/Ni), infiltrated by a polymer electrolyte. The LCO half-cell was electrochemically and mechanically tested for an initial evaluation of this battery concept. Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Seth Robbins (srobbins@illinois.edu) on 2013-02-03T19:18:57Z Item is restricted until 2015-02-03T19:18:53Z U of I Only Restriction Lifted for Item 42081 on 2015-02-03T11:00:38Z. http://hdl.handle.net/2142/42134 en Copyright 2012 Ankit Verma Lithium-ion batteries silicon electrode tin electrode solid electrolyte surface morphology study Morphology and mechanical behavior of composite electrodes for Li-ion batteries text Aerospace Engineering 1615 Aerospace Engineering 4048 University of Illinois at Urbana-Champaign Thesis M.S. MS: Aerospace Engr -UIUC 10KS4048MS