title: Improving the stability of nanostructured silicon thin film lithium-ion battery anodes through their controlled oxidation.
abstract: Silicon and partially oxidized silicon thin films with nanocolumnar morphology were synthesized by evaporative deposition at a glancing angle, and their performance as lithium-ion battery anodes was evaluated. The incorporated oxygen concentration was controlled by varying the partial pressure of water during the deposition and monitored by quartz crystal microbalance, X-ray photoelectron spectroscopy. In addition to bulk oxygen content, surface oxidation and annealing at low temperature affected the cycling stability and lithium-storage capacity of the films. By simultaneously optimizing all three, films of ~2200 mAh/g capacity were synthesized. Coin cells made with the optimized films were reversibly cycled for ~120 cycles with virtually no capacity fade. After 300 cycles, 80% of the initial reversible capacity was retained.
authors.affiliation: Department of Chemical Engineering, University of Texas at Austin, 1 University Station C0400, Austin, Texas 78712, USA.
authors.forename: Paul R
authors.initials: PR
authors.lastname: Abel
authors.forename: Yong-Mao
authors.initials: YM
authors.lastname: Lin
authors.forename: Hugo
authors.initials: H
authors.lastname: Celio
authors.forename: Adam
authors.initials: A
authors.lastname: Heller
authors.forename: C Buddie
authors.initials: CB
authors.lastname: Mullins
mesh_terms: D011211:Electric Power Supplies; D004563:Electrochemistry; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010084:Oxidation-Reduction; D012825:Silicon / Q000737:chemistry*
chemical_list: D008094:Lithium; D012825:Silicon