Combinatorial Studies of Si1−xOxas a Potential Negative Electrode Material for Li-Ion Battery Applications
- 7 June 2013
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 160 (9), A1587-A1593
- https://doi.org/10.1149/2.115309jes
Abstract
Thin films of Si1−xOx were produced using combinatorial sputtering methods. X-ray diffraction studies of these films show that they are amorphous or nanostructured. The effect of oxygen content on the electrochemical performance of these materials was studied. The reversible specific capacity (between 0.005 and 0.9 V) agrees with the assumption that Si1−xOx is made up of amorphous silicon, which can react to form Li3.75Si, and amorphous SiO2, which reacts to form Li4SiO4. The irreversible capacity increases with oxygen content when measured to a potential limit of 0.9 V vs Li/Li+ but further Li can be extracted from sites presumably near oxygen up to a potential of 2.0 V vs Li/Li+. However, such potentials for the negative electrode would not be reached in a full Li-ion cell. This work shows that the oxygen content in Si1−xOx should be optimized to produce materials with a reasonable active/inactive ratio in order to have electrodes with the desired specific capacity, an appropriate irreversible capacity and an appropriate amount of inactive phase to buffer volume expansion. © 2013 The Electrochemical Society. [DOI: 10.1149/2.115309jes] All rights reserved. Manuscript submitted July 10, 2013; revised manuscript received July 10, 2013. Published July 19, 2013. Carbon and/or graphite has been employed extensively asKeywords
This publication has 29 references indexed in Scilit:
- Reaction Mechanism of “SiO”-Carbon Composite-Negative Electrode for High-Capacity Lithium-Ion BatteriesJournal of the Electrochemical Society, 2012
- SiOx–graphite as negative for high energy Li-ion batteriesJournal of Power Sources, 2011
- Nano-sized SiOx/C composite anode for lithium ion batteriesJournal of Power Sources, 2011
- A New Design for a Combinatorial Electrochemical Cell Plate and the Inherent Irreversible Capacity of Lithiated SiliconElectrochemical and Solid-State Letters, 2011
- Characterizations and electrochemical behaviors of disproportionated SiO and its composite for rechargeable Li-ion batteriesJournal of Materials Chemistry, 2010
- Use of Sn–Si nanocomposite electrodes for Li rechargeable batteriesChemical Communications, 2004
- Reaction of Li with Alloy Thin Films Studied by In Situ AFMJournal of the Electrochemical Society, 2003
- Design and Testing of a 64-Channel Combinatorial Electrochemical CellJournal of the Electrochemical Society, 2003
- Economical Sputtering System To Produce Large-Size Composition-Spread Libraries Having Linear and Orthogonal Stoichiometry VariationsChemistry of Materials, 2002
- Active/Inactive Nanocomposites as Anodes for Li-Ion BatteriesElectrochemical and Solid-State Letters, 1999