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Magnetic and Transport Properties of Heat-Treated Polyparaphenylene-Based Carbons

Published online by Cambridge University Press:  10 February 2011

M. J. Matthews ,
N. Kobayashi ,
M. S. Dresselhaus ,
M. Endo ,
T. Enoki  and
T. Karaki
M. J. Matthews
Affiliation:
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139
N. Kobayashi
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Tokyo, 152, Japan
M. S. Dresselhaus
Affiliation:
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139 Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139
M. Endo
Affiliation:
Faculty of Engineering, Shinshu University, Nagano, 380, Japan
T. Enoki
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Tokyo, 152, Japan
T. Karaki
Affiliation:
Faculty of Engineering, Shinshu University, Nagano, 380, Japan
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Electron spin resonance (ESR), magnetic susceptibility, and transport measurements were recently performed on a set of heat-treated polyparaphenylene (PPP)-based carbon samples, which are of significant interest as novel carbon-based anode electrodes in Li-ion batteries. Attention is focused on the evolution of the carbonaceous structures formed at low heat-treatment temperatures (THT) in the regime of 600° C ≤ THT ≤ 800° C, where percolative transport behavior is observed. At the percolation threshold, the coexistence of two spin centers with peak-to-peak Lorentzian linewidths of ΔHpp(300K) = 0.5 and 5.0 G is observed. The relatively high ratio of hydrogen. carbon (H/C) near is believed to influence the ESR results through an unresolved hyperfine interaction. Curie-Weiss temperaures are found from measurements of [Ipp(ΔHpp)2]–1, where Ipp is the peak-to-peak lineheight, yielding results that are in agreement with static susceptibility, χ(T), measurements. At low THT, PPP-based materials exhibit a large amount of disorder and this is evidenced by the high density of localized spins, Nc, which is obtained from a Curie-Weiss fit to χ(T) assuming a spin quantum number of S = ½. A model explaining the microstructure and high electrochemical doping capacity of PPP samples heat-treated to 700° C can be related to Li-ion battery performance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 533
Copyright
Copyright © Materials Research Society 1998

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