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Published on: January 20, 2023
Improving the stability of nanostructured silicon thin film lithium-ion battery anodes through their controlled
Paul R Abel1, Yong-Mao Lin, Hugo Celio
1Department of Chemical Engineering, University of Texas at Austin, 1 University Station C0400, Austin, Texas 78712, USA.
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.
