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Investigation of the sodiation and desodiation of hard carbon by electrochemical testing and X-Ray computed tomography
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Ledwoch, Daniela, Brett, Daniel J. L., Shearing, Paul R. and Kendrick, Emma (2017) Investigation of the sodiation and desodiation of hard carbon by electrochemical testing and X-Ray computed tomography. ECS Transactions, 75 (52). pp. 81-90. doi:10.1149/07552.0081ecst ISSN 1938-5862.
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Official URL: http://dx.doi.org/10.1149/07552.0081ecst
Abstract
Sodium ion diffusion plays a key role within the charging and discharging mechanisms in a sodium ion battery. The mobility of sodium ions is important to allow full sodiation of hard carbon materials and enables faster charge and discharge rates for batteries. This investigation studies the diffusion of sodium ions by combining a physical characterisation technique and an electrochemical testing method for a hard carbon composite electrode. Untreated and sodiated hard carbon composite electrodes have been imaged on microscale using x-ray computed tomography to visualise volume changes, and simulate tortuosity and sodium ion concentration distribution by using the MATLAB plug-in TauFactor. Furthermore a comparison to calculated apparent diffusion coefficients determinded by galvanostatic intermittent titration technique was done. The results indicate a correlation of an increasing tortuosity due to the sodiation of hard carbon and the decrease in sodium ion mobility.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
Journal or Publication Title: | ECS Transactions | ||||
Publisher: | Electrochemical Society, Inc. | ||||
ISSN: | 1938-5862 | ||||
Official Date: | 2017 | ||||
Dates: |
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Volume: | 75 | ||||
Number: | 52 | ||||
Page Range: | pp. 81-90 | ||||
DOI: | 10.1149/07552.0081ecst | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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