Physical mixtures of Si nanoparticles and carbon nanofibers as anode materials for lithium-ion batteries

Jeong Boon Koo, Bo Yun Jang, Sung Soo Kim, Kyoo Seung Han, Doo Hwan Jung, Seong Ho Yoon

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1 Citation (Scopus)

Abstract

Silicon nanoparticles (Si NPs) were simply mixed with carbon nanofibers (CNFs) without any chemical process at various weight ratios, and the electrochemical properties of these nanoparticles as anode materials were investigated in lithium-ion batteries (LIBs). To study the effects of the physical incorporation of CNFs on the volumetric variations in Si NPs, the dilations of full cells were measured. The measured volumetric change of the anode using a mixture of Si NPs and CNFs was smaller than that calculated from the theoretical volumetric changes of Si and graphite. Although the reversible capacity of Si NPs faded sharply, the fading was mitigated by increasing the mixing ratio of CNFs. In particular, the Si NP/ CNF mixture prepared at 50 : 50 weight ratio retained a reversible capacity of > 800mAh/g with a capacity retention of 53.2% even after 100 cycles. CNFs alleviated stress and strain during the charge-discharge process even though there was no tight chemical bonding with Si NPs.

Original languageEnglish
Article number085001
JournalJapanese Journal of Applied Physics
Volume54
Issue number8
DOIs
Publication statusPublished - Aug 1 2015

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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