Improving the Stability of Nanostructured Silicon Thin Film Lithium-Ion Battery Anodes through Their Controlled Oxidation

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 wa...

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Bibliographic Details
Published in:ACS nano 2012-03, Vol.6 (3), p.2506-2516
Main Authors: Abel, Paul R, Lin, Yong-Mao, Celio, Hugo, Heller, Adam, Mullins, C. Buddie
Format: Article
Language:English
Subjects:
Anodes
Deposition
Electric Power Supplies
Electrochemistry
Electrodes
Lithium - chemistry
Lithium-ion batteries
Microbalances
Nanostructure
Nanostructures - chemistry
Oxidation
Oxidation-Reduction
Silicon - chemistry
Silicon films
Stability
Thin films
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Summary: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.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn204896n