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

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• 作者：Paul R. Abel ; Yong-Mao Lin ; Hugo Celio ; Adam Heller ; C. Buddie Mullins
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：March 27, 2012
• 年：2012
• 卷：6
• 期：3
• 页码：2506-2516
• 全文大小：739K
• 年卷期：v.6,no.3(March 27, 2012)
• ISSN：1936-086X

文摘

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.

Keywords:

silicon; SiO_x; lithium-ion battery; nanostructured; reactive ballistic deposition