Silicon-based anodes prepared by gas-deposition method for next generation lithium-ion battery

2014 Fiscal Year Final Research Report

• Project/Area Number: 24350094
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Functional materials/Devices
• Research Institution: Tottori University
• Principal Investigator: SAKAGUCHI Hiroki 鳥取大学, 工学(系)研究科(研究院), 教授 (00202086)
• Co-Investigator(Kenkyū-buntansha): USUI Hiroyuki 鳥取大学, 大学院工学研究科, 准教授 (60423240)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: リチウム二次電池 / 負極 / ケイ素 / 合金 / シリサイド / ガスデポジション法 / 厚膜

Outline of Final Research Achievements

As an anode of Li-ion battery, Si has a problem of a poor cyclability due to its large volume changes during charge－discharge and a resulting stress. We prepared composite thick-film electrodes consisting of rare-earth metal silicides and elemental Si by a gas-deposition method, and investigated their anode performances. Among various rare-earth silicides/Si electrodes, Gd－Si/Si electrode exhibited the most excellent cycling performance. We revealed that the excellent performance was caused by four properties of Gd－Si: a moderate Li-storage ability, a high electronic conductivity, a high thermodynamic stability, and a more elastic property than other silicides. This elastic property probably relaxes the stress during charge－discharge.

Free Research Field

無機材料化学，電気化学