Diffusion Coefficient of Lithium for Intercalation in Highly Oriented Pyrolytic Graphite

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作者：
Nu-Li, Yun-Na [1 ]
Wan, Chuan-Yun [1 ]
Yan, Man-Ming [1 ]
Zhuang, Ji-Hua [1 ]
Jiang, Zhi-Yu [1 ]
机构：
[1] Department of Chemistry, Fudan University, Shanghai 200433, China
来源：
| 2002年 / Higher Education Press卷 / 23期
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摘要：
The diffusion coefficient of lithium in Highly Oriented Pyrolytic Graphite (HOPG) was measured by using electrochemical impedance spectra (EIS) and potential step methods in 1 mol/L LiPF6, V(EC) : V(DMC) = 1 : 1 solution. It was found that the resistance of SEI film and the polarization resistance decreased with the increase of lithium intercalation degree. A agreement was obtained between the diffusion coefficient values measured from these two methods. The diffusion coefficient of lithium in HOPG decreased from 10-11 cm2/s to 10-12 cm2/s in the potential region of 0. 2-0. 05 V.
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