期刊
ELECTROCHIMICA ACTA
卷 54, 期 10, 页码 2843-2850出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.11.021
关键词
Sn-based anode; Sn/Cu6Sn5 composite; Thin film; Electron-beam deposition; Lithium ion batteries
资金
- Ministry of Education [IRT0551]
- Guangdong Provincial Natural Science Foundation
Sn/Cu6Sn5 alloy composite thin films were directly prepared by electron-beam deposition for anodes of lithium ion batteries. The thin film was comprised of micro/sub-microcrystal line Sn and Cu6Sn5, where the polyhedral micro-sized Sn grains were uniformly dispersed in the loose Cu6Sn5 matrix. Lithiation reaction kinetics were confirmed to be controlled by a diffusion step and the diffusion coefficient of Li+ in the thin film anode was determined to be 1.91 x 10(-7) cm(2)/s. The galvanostatic cycling behavior of Sn/Cu6Sn5 composite thin film anodes was studied under different conditions. Stable capacities of more than 370 mAh/g were obtained by discharging from 1.25 to 0.1 V. Structure changes and fading mechanism of the thin film electrodes was discussed based on SEM, XRD and EDX investigations. The present results demonstrated that the multi-phase composite structure can improve electrochemical performance of the Cu-Sn alloy thin film electrodes. (C) 2008 Elsevier Ltd. All rights reserved.
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