期刊
ACS NANO
卷 6, 期 3, 页码 2506-2516出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn204896n
关键词
silicon; SiOx; lithium-ion battery; nanostructured; reactive ballistic deposition
类别
资金
- Welch Foundation [F-1131, F-1436]
- Hertz Foundation
- National Science Foundation [0618242]
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 similar to 2200 mAh/g capacity were synthesized. Coin cells made with the optimized films were reversibly cycled for similar to 120 cycles with virtually no capacity fade. After 300 cycles, 80% of the initial reversible capacity was retained.
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