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

  • M. J. Matthews (a1), N. Kobayashi (a2), M. S. Dresselhaus (a1) (a3), M. Endo (a4), T. Enoki (a2) and T. Karaki (a4)...


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 (T HT ) in the regime of 600° C ≤ T HT ≤ 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 ΔH pp (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 [I pp H pp )2]–1, where I pp is the peak-to-peak lineheight, yielding results that are in agreement with static susceptibility, χ(T), measurements. At low T HT , PPP-based materials exhibit a large amount of disorder and this is evidenced by the high density of localized spins, N c , 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.



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