Diffusion Coefficient of Lithium for Intercalation in Highly Oriented Pyrolytic Graphite

Abstract

Abstract: The diffusion coefficient of lithium in Highly Oriented Pyrolytic Graphite(HOPG) was measured by using electrochemical impedance spectra(EIS) and potential step methods in 1mol/L LiPF₆, V(EC)∶V(DMC)=1∶1 solution. It was found that the resistance of SEIfilm and the polarization resistance decreased with the increase of lithium intercalation degree. Aagreement was obtained between the diffusion coefficient values measured from these two methods. The diffusion coefficient of lithium in HOPGdecreased from 10^-11 cm²/s to 10^-12 cm²/s in the potential region of 0.2-0.05 V.

Key words: Highly oriented pyrolytic graphite, Negative electrode of lithium ion battery, Diffusion coefficient, Intercalation reaction

CLC Number:

O646

TrendMD:

NU LI Yun-Na, WAN Chuan-Yun, YAN Man-Ming, ZHUANG Ji-Hua, JIANG Zhi-Yu  . Diffusion Coefficient of Lithium for Intercalation in Highly Oriented Pyrolytic Graphite[J]. Chem. J. Chinese Universities, 2002, 23(7): 1375.

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Diffusion Coefficient of Lithium for Intercalation in Highly Oriented Pyrolytic Graphite

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