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Structural modifications of disordered mesocarbon microbeads with lower temperatures of heat treatment

Published online by Cambridge University Press:  31 January 2011

Prathap Haridoss ,
Francisco A. Uribe ,
Fernando H. Garzon  and
Thomas A. Zawodzinski Jr.
Prathap Haridoss
Affiliation:
Electronic and Electrochemical Materials and Devices Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Francisco A. Uribe
Affiliation:
Electronic and Electrochemical Materials and Devices Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Fernando H. Garzon
Affiliation:
Electronic and Electrochemical Materials and Devices Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Thomas A. Zawodzinski Jr.
Affiliation:
Electronic and Electrochemical Materials and Devices Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Extract

We describe the variation of structural and physical properties of mesocarbon microbeads, a potential anode material for rechargeable lithium batteries, as a function of heat-treatment temperature in the range 400–1100 °C. Scanning electron microscopy (SEM) studies indicated changes in the morphology of the mesocarbons with heat treatment. X-ray studies show that average crystallite size varies considerably with heat treatment. The d002 spacing decreases with increasing heat-treatment temperatures. The electronic conductivity of the mesocarbon microbeads also increases substantially with increasing heat-treatment temperature. Based on thermogravimetric analysis (TGA) and other measurements, we find that organic fractions volatilizes out of these carbons in two distinct stages. The observed weight loss correlates with the structural changes observed. We suggest that these observations are consistent with two types of hydrogenated fractions present in the “green” mesocarbons.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 7 , July 1998 , pp. 2015 - 2022
Copyright
Copyright © Materials Research Society 1998

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