A possible way to measure lithium ion diffusion coefficient for Li insertion thin film with unknown Li composition: application to Li
                    α
                    CoO
                    2
                    and WO
                    3

ABSTRACTThe electrochemical permeation method was applied to the determination of the diffusion coefficient of Li+ion (DLi+) in a glassy carbon (GC) plate. The cell was composed of two compartments, which were separated by the GC plate. Li+ions were inserted electrochemically from one face, and extracted from the other. The flux of the permeated Li+ions was monitored as an oxidation current at the latter face. The diffusion coefficient was determined by fitting the transient current curve with a theoretical one derived from Fick's law. When the potential was stepped between two potentials in the range of 0 to 0.5 V, transient curves were well fitted with the theoretical one, which gaveDLi+ values on the order of 10−8cm2s−1. In contrast, when the potential was stepped between two potentials across 0.5 V, significant deviation was observed. The deviation indicated the presence of trap sites as well as diffusion sites for Li+ions, the former of which is the origin of the irreversible capacity of GC.

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Determination of the Lithium Ion Diffusion Coefficient in Graphite

Journal of The Electrochemical Society ◽

10.1149/1.1391556 ◽

1999 ◽

Vol 146 (1) ◽

pp. 8-14 ◽

Cited By ~ 238

Author(s):

Ping Yu ◽

B. N. Popov ◽

J. A. Ritter ◽

R. E. White

Keyword(s):

Diffusion Coefficient ◽

Lithium Ion ◽

Ion Diffusion ◽

Lithium Ion Diffusion

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Misfit dislocations induced by lithium-ion diffusion in a thin film anode

Journal of Solid State Electrochemistry ◽

10.1007/s10008-016-3377-2 ◽

2016 ◽

Vol 21 (2) ◽

pp. 419-427 ◽

Cited By ~ 2

Author(s):

Xiangdong Li ◽

Qihong Fang ◽

Hong Wu ◽

Jia Li ◽

Youwen Liu ◽

...

Keyword(s):

Thin Film ◽

Lithium Ion ◽

Misfit Dislocations ◽

Ion Diffusion ◽

Lithium Ion Diffusion

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Effect of Ni2+ on Lithium-Ion Diffusion in Layered LiNi1−x−yMnxCoyO2 Materials

Crystals ◽

10.3390/cryst11050465 ◽

2021 ◽

Vol 11 (5) ◽

pp. 465

Author(s):

Yuanyuan Zhu ◽

Yang Huang ◽

Rong Du ◽

Ming Tang ◽

Baotian Wang ◽

...

Keyword(s):

Diffusion Coefficient ◽

Lithium Ion ◽

Ion Diffusion ◽

Local Coordination ◽

Excellent Electrochemical Performance ◽

Layered Cathode Materials ◽

Li Ion ◽

Dynamics Simulations ◽

And Diffusion ◽

Lithium Ion Diffusion

LiNi1−x−yMnxCoyO2 materials are a typical class of layered cathode materials with excellent electrochemical performance in lithium-ion batteries. Molecular dynamics simulations are performed for LiNi1−x−yMnxCoyO2 materials with different transition metal ratios. The Li/Ni exchange ratio, ratio of anti-site Ni2+ to total Ni2+, and diffusion coefficient of Li ions in these materials are calculated. The results show that the Li-ion diffusion coefficient strongly depends on the ratio of anti-site Ni2+ to total Ni2+ because their variation tendencies are similar. In addition, the local coordination structure of the Li/Ni anti-site is analyzed.

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