Journal of Applied Electrochemistry

, Volume 42, Issue 2, pp 69–74 | Cite as

Preparation and electrochemical properties of SiO2–non-graphitizable carbon composites as negative electrode materials for Li-ion batteries

  • Takayuki Doi
  • Masao Tagashira
  • Yasutoshi Iriyama
  • Takeshi Abe
  • Zempachi Ogumi
Original Paper

Abstract

SiO2–non-graphitizable carbon composites were prepared by pyrolysis of a mixture of ethyl cellulose and nano-sized SiO2. The composite electrode showed high reversibility in insertion and/or extraction reactions of Li ions at potentials below 1 V with little hysteresis after the 2nd cycle, whereas a large irreversible capacity was observed in the 1st cycle. This reversible capacity increased with increasing SiO2 content above 5 wt%. Li ion transfer at the interface between a composite electrode and an electrolyte was studied by ac impedance spectroscopy. In the Nyquist plots, a semi-circle that was assigned to charge-transfer resistance (Rct) because of Li ion transfer across the interface between the composite electrode and electrolyte appeared at potentials below 1 V. The values of Rct decreased with increasing SiO2 content. These results indicate that both a decrease in Rct and an increase in reversible capacity can be achieved by use of SiO2–non-graphitizable carbon composite electrodes; this would lead to Li-ion batteries with higher power and energy density.

Keywords

Non-graphitizable carbon Silicon oxide Negative electrode Lithium-ion battery 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Takayuki Doi
    • 1
    • 2
  • Masao Tagashira
    • 3
  • Yasutoshi Iriyama
    • 4
  • Takeshi Abe
    • 3
  • Zempachi Ogumi
    • 3
  1. 1.Institute for Materials Chemistry and EngineeringKyushu UniversityKasugaJapan
  2. 2.Office of Society-Academia Collaboration for InnovationKyoto UniversityGokasho, UjiJapan
  3. 3.Graduate School of EngineeringKyoto UniversityKyotoJapan
  4. 4.Department of Materials Science & Chemical Engineering, Faculty of EngineeringShizuoka UniversityHamamatsuJapan

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