Fabrication of Porous Sn Thin Film by Modulating Deposition Conditions for Capacity Enlargement and Life Extension of Lithium Ion Battery

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630002
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Tohoku University
• Principal Investigator: SAKA Masumi 東北大学, 工学(系)研究科(研究院), 教授 (20158918)
• Co-Investigator(Kenkyū-buntansha): LI Yuan 東北大学, 大学院工学研究科, 助教 (50625001)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 機械材料・材料力学 / Sn薄膜 / リチウムイオン電池 / 充放電特性 / ポーラス構造

Outline of Final Research Achievements

To break up the capacity bottleneck of current lithium ion battery (LIB), Sn thin-film negative electrode with higher theoretical capacity than current carbon has raised great attention. However, the large volume expansion-contraction of Sn thin film accompanied with charge-discharge cycles will result in pulverization and whisker formation, which will lead to the degradation of cycling performance. With the hope of mitigating such enormous volume change and therefore improving the performance of the corresponding LIB, the optimization of surface morphologies of Sn thin film by modulating the sputtering parameters was proposed. Here, the electrochemical performance of a series of Sn thin-film negative electrodes deposited at various conditions was investigated. The characterization of the relationship among sputtering parameters, surface morphologies of Sn thin films, and the cycling performance will provide fundamental insights for the capacity enlargement and life extension of LIB.

Free Research Field

工学