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Characterization of polyparaphenylene (PPP)-based carbons

Published online by Cambridge University Press:  31 January 2011

M. J. Matthews ,
M. S. Dresselhaus ,
M. Endo ,
Y. Sasabe ,
T. Takahashi  and
K. Takeuchi
M. J. Matthews
Affiliation:
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
M. S. Dresselhaus
Affiliation:
Department of Electrical Engineering and Computer Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
M. Endo
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan
Y. Sasabe
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan
T. Takahashi
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan
K. Takeuchi
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan

Abstract

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Polyparaphenylene (PPP)-based carbons heat-treated at temperatures (THT) from 600 °C up to 3000 °C have been characterized both structurally and in terms of their physical properties. Special attention is given to PPP heat-treated at 700 °C (denoted by PPP-700), since samples heat-treated to this temperature were observed to have exceptionally high lithium affinities when electrochemically doped with Li. At low THT below 700 °C, it is found that the local structure of PPP-based samples can be characterized mostly in terms of a disordered polymer. As a result of heat treatment to high temperature, PPP-based carbon shows graphitization behavior with regard to x-ray diffraction d002 (graphite c-axis d-spacing) development and to the increase of the Raman IG/ID intensity ratio (where IG and ID are the integrated intensities of the 1580 cm−1 and 1360 cm−1 Raman modes, respectively), as is found in so-called graphitizing carbons. However, development of the c-axis crystallite size (Lc) is restricted to very small values, in the range of so-called nongraphitizing carbons, while the a-axis crystallite size (La) attains values up to roughly 120 Å for heat treatments near 3000 °C. These structural properties of PPP-based carbons are consistent with the observed electrical characteristics and their dependence on THT. Low temperature magnetic susceptibility measurements were analyzed, along with Raman spectra, allowing for the characterization of disorder in terms of localized spin states for several heat-treated PPP samples. By interpreting the results of these various characterization techniques, we are able to present an insightful perspective on the nature of PPP-based carbons and the role of PPP-700 as an effective lithium host material for secondary battery applications.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 12 , December 1996 , pp. 3099 - 3109
Copyright
Copyright © Materials Research Society 1996

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