Fast and reversible lithium storage in a wrinkled structure formed from Si nanoparticles during lithiation/delithiation cycling

Shinichiroh Iwamura, Hirotomo Nishihara, Takashi Kyotani

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Though silicon (Si) is expected as a high capacity negative electrode for lithium-ion batteries, its drastic structure change during lithiation/ delithiation cycling hampers its stable cyclability. In this work, we report that a specific structure, a wrinkled structure, is temporarily formed from Si nanoparticles (particle size was ca. 82 nm) at relatively early numbers of lithiation/delithiation cycling, and that the wrinkled structure thus formed shows a good performance. Though this structure soon transforms into a different one, resulting in fading of the performance, such transformation of the Si framework can be frozen at the state of the wrinkled structure by restricting lithiation degree. Interestingly, when Si nanoparticles are covered with a carbon nanolayer (thickness was ca. 10 nm) beforehand, the carbon layer is also deformed together with Si and is taken in by the wrinkled structure. Such carbon-coating improves the rate performance of Si nanoparticles; the carbon-coated Si nanoparticles show a constant discharge capacity of 1500 mAh g-1-composite over 100 cycles and exhibit an excellent rate performance (1500 mAh g-1-composite even at a rate of 3.3 C).

Original languageEnglish
Pages (from-to)400-409
Number of pages10
JournalJournal of Power Sources
Volume222
DOIs
Publication statusPublished - 2013 Jan 1

Keywords

  • Carbon-coating
  • Lithium-ion batteries
  • Pressure-pulsed chemical vapor deposition
  • Silicon nanoparticles
  • Wrinkled structure

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Fast and reversible lithium storage in a wrinkled structure formed from Si nanoparticles during lithiation/delithiation cycling'. Together they form a unique fingerprint.

  • Cite this