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Laser generation of Si@C core-shell nanowires and its application to the fabrication of next-generation Li-ion battery

Research Project

Project/Area Number 21K18681
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
Research InstitutionKeio University

Principal Investigator

Yan Jiwang  慶應義塾大学, 理工学部(矢上), 教授 (40323042)

Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2021: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywordsリチウムイオン電池 / シリコン負極 / レーザ照射 / 単結晶シリコン / ナノファイバー / 複合ナノ粒子 / ナノ構造体 / コアシェル構造 / ナノ粒子 / シリコン / カーボン / 複合粒子 / 負極材料
Outline of Research at the Start

電気自動車やスマートハウスの普及に伴い,リチウムイオン電池の高容量化が求められている.従来の炭素電極の代わりに高容量化の見込めるシリコン負極の研究が進められているが,シリコン負極は充電時に体積膨張が生じるため,充放電を繰り返すとシリコン膜が崩壊する問題がある.本研究では,半導体産業から大量に排出させるシリコンスラッジに適量な炭素粉末を混合させ,高出力レーザを照射することによりシリコンと炭素からなる複合ナノワイヤを生成させ,集電体である銅箔表面へ堆積させる.これにより高性能な負極を創製し,シリコン負極の諸問題を解決する.

Outline of Final Research Achievements

Graphene-coated silicon core-shell nanostructures have attracted attention in the fields of energy storage such as lithium-ion batteries. In this study, multilayer graphene-coated silicon and silicon carbide nanowires were obtained through the laser irradiation of a mixture target of graphite powder and silicon grinding sludge discharged from wafer manufacturing. The effect of laser irradiation conditions on the morphology of the generated nanostructures was investigated. Results showed that nanowires were produced under specific conditions, and the nanowires were covered by multiple graphene layers. The nanowire formation was closely related to the propagation speed and shape variation of the plume. These nanowires are useful for improving the performance of lithium-ion battery and solve the problems of conventional silicon anodes. The production of core-shell nanowires from silicon waste opens up the possibility of the sustainable development of nanomaterials for energy storage.

Academic Significance and Societal Importance of the Research Achievements

本手法で生成したSi@CとSiC@C複合ナノファイバーは充電時のSi体積膨脹を吸収でき、かつ曲げ変形に強いため,電極表層脱落や破砕を抑制し,長寿命のSi電極が製作可能となる.また,ナノファイバー表面へ多層グラフェンコーティングを形成させることによって電極の導電性を向上させ,電気抵抗を大幅に低減させることが可能である.本研究の成果により,産業廃棄物とされている大量なSi切りくずが新しいLiイオン電池の原料へ変身することが可能となる.この試みは学術的にも産業的にもチャレンジ性の非常に高い研究課題であり,本研究の成果により特にエネルギー産業に大きな波及効果がもたらされると考えられる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (6 results)

All 2022 2021

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Generation of Si@C/SiC@C core-shell nanoparticles by laser irradiation of silicon grinding waste2022

    • Author(s)
      Kanon Minami,Kyosuke Kobinata,Jiwang Yan
    • Journal Title

      Nano Select

      Volume: 1 Issue: 7 Pages: 1-9

    • DOI

      10.1002/nano.202200001

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 廃シリコン粉末へのレーザ照射による Si/C 複合ナノ粒子生成2022

    • Author(s)
      南 かのん,小日向 恭祐,閻 紀旺
    • Organizer
      2022年度精密工学 会春季大会 学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 紀旺, シリコン研削切りくずへ のミリ秒レーザ照 射による 3C-SiCナノワイヤ生成2022

    • Author(s)
      南 かのん,小日向 恭祐,閻 紀旺
    • Organizer
      日本機械学会第 13回マイクロ・ナノ工学シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] Fabrication of SiC nanowires by laser irradiation of Si grinding waste2022

    • Author(s)
      Kanon Minami, Kyosuke Kobinata, Jiwang Yan
    • Organizer
      International Conference on Advanced Nanomaterials
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Generation of nanomaterials from slicing/grinding chips of silicon crystals2022

    • Author(s)
      Jiwang Yan
    • Organizer
      The16th China‐Japan International Conference on Ultra‐Precision Machining Process 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Generation of Si@C core-shell nanoparticles by laser irradiation of grinding wastes2021

    • Author(s)
      Kanon Minami, Kyosuke Kobinata, Jiwang Yan
    • Organizer
      International Conference on Precision Engineering and Sustainable Manufacturing (PRESM 2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-07-13   Modified: 2024-01-30  

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