Correlation Between Microstructure and Electrochemical Performances for Coal-tar Pitch Based Meso-carbon Microbeads

Abstract

Abstract: Coal-tar pitch based meso-carbon microbeads(MCMB) were heat-treated with a certain technology under different maximum heat-treatment temperatures(HTT_max). Microstructure parameters of the heat-treated samples were characterized by XRD and Raman spectroscopic studies. Electrochemical performances of the samples used as the negative electrodes in lithium ion secondary batteries were examined through galvanostatic and cyclic voltametry measurements. Correlation between microstructures and electrochemical performances for MCMB was discussed. The results reveal that with increasing HTT_max, mi-crostructure characteristics of the MCMB undergo a structural transition from pyrolytic carbon to artificial graphitic carbon. Accordingly, the lithium ion storage mechanism of the electrode exhibits a transition from pin-pore storage to lithium insertion between carbon layers. The crystalline size along a axis (L_a) of MCMB does not greatly increase when being heat-treated due to the peculiar arc arrangement of carbon layers in MCMB. The appropriate L_avalue of the MCMB obtained under extremely high temperatures is the internal reason for its excellent electrochemical performances.

Key words: Lithium-ion battery, Carbon anode, Mesocarbon microbead, Electrochemical performance

CLC Number:

TM912.9

TrendMD:

ZHENG Hong-He, ZHANG Hu-Cheng, WANG Jian-Ji, SU Yu-Chang, XU Zhong-Yu. Correlation Between Microstructure and Electrochemical Performances for Coal-tar Pitch Based Meso-carbon Microbeads[J]. Chem. J. Chinese Universities, 2003, 24(9): 1666.

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Correlation Between Microstructure and Electrochemical Performances for Coal-tar Pitch Based Meso-carbon Microbeads

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