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A Study of Diffusion in Lithium-ion Electrodes Under Fast Charging Using Electrochemical Impedance Spectroscopy

Published online by Cambridge University Press:  20 June 2017

Kazi Ahmed ,
Jeffrey Bell ,
Rachel Ye ,
Bo Dong ,
Yige Li ,
Cengiz S. Ozkan  and
Mihrimah Ozkan
Kazi Ahmed*
Affiliation:
Department of Electrical and Computer Engineering, University of California, Riverside
Jeffrey Bell
Affiliation:
Materials Science and Engineering Program, University of California, Riverside
Rachel Ye
Affiliation:
Materials Science and Engineering Program, University of California, Riverside
Bo Dong
Affiliation:
Department of Electrical and Computer Engineering, University of California, Riverside
Yige Li
Affiliation:
Materials Science and Engineering Program, University of California, Riverside Department of Mechanical Engineering, University of California, Riverside
Cengiz S. Ozkan
Affiliation:
Materials Science and Engineering Program, University of California, Riverside Department of Mechanical Engineering, University of California, Riverside
Mihrimah Ozkan
Affiliation:
Department of Electrical and Computer Engineering, University of California, Riverside
*
*(Email: kahme001@ucr.edu)
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Abstract

An in-depth look at diffusion mechanics within lithium-ion electrodes under fast charging conditions is presented. Electrochemical impedance spectroscopy is used as the primary technique to investigate lithium diffusion within electrode material and in electrolyte near the electrode-electrolyte interface. Half-cells of silicon are charged under varying galvanostatic rates while obtaining impedance data. Collected data is analyzed with the help of an electrical equivalent circuit model that provides mechanical and electrochemical parameters for each instance. The novelty of this equivalent circuit partly lies in its ability to resolve between solid-phase diffusion and liquid-phase diffusion, both of which occur during cycling of a lithium-ion electrode. Observed patterns in the parameters of this circuit provide insight into impact of fast charging on mechanics of lithium diffusion, both inside the electrode matrix and within electrolyte.

Keywords

diffusionenergy storageion-solid interactions
Type
Articles
Information
MRS Advances , Volume 2 , Issue 54: Energy Storage and Conversion , 2017 , pp. 3309 - 3315
Copyright
Copyright © Materials Research Society 2017 

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References

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