Development of open-cell type nanoporous silicon for long lifetime and high capacity lithium secondary battery electrode

2016 Fiscal Year Final Research Report

• Project/Area Number: 25246009
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nanomaterials engineering
• Research Institution: Tohoku University
• Principal Investigator: Hidemi Kato 東北大学, 金属材料研究所, 教授 (80323096)
• Co-Investigator(Kenkyū-buntansha): 和田 武 東北大学, 金属材料研究所, 助教 (10431602) ; 市坪 哲 京都大学, 工学(系)研究科(研究院), 准教授 (40324826)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: ポーラス材料 / リチウム二次電池 / 負極 / シリコン / デアロイング

Outline of Final Research Achievements

A dealloying in metallic melt, a novel top-down process for preparing nanoporous Si powder was developed. By immersing magnesium-silicon alloy precursor in bismuth metal melt, magnesium selectively dissolved into bismuth melt and the remaining silicon atoms self-organized into an open-cell type nanoporous structure. A lithium secondary battery anode made with the developed nanoporous Si exhibited about 3 times higher capacity than that of graphite anode and extremely long lifetime exceeding 1500 cycles.

Free Research Field

ポーラス金属