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Binder migration during drying of lithium-ion battery electrodes: modelling and comparison to experiment

Binder migration during drying of lithium-ion battery electrodes: modelling and comparison to experiment
Binder migration during drying of lithium-ion battery electrodes: modelling and comparison to experiment
The drying process is a crucial step in electrode manufacture that may lead to spatial inhomogeneities in the distribution of the electrode components resulting in impaired cell performance. Binder migration during the drying process, and the ensuing poor binder coverage in certain regions of the electrode, can lead to capacity fade and mechanical failure (e.g. electrode delamination from the current collector). A mathematical model of electrode drying is presented which tracks the evolution of the binder distribution, and is applicable in the relatively high drying rates encountered in industrial electrode manufacture. The model predicts that constant low drying rates lead to a favourable homogeneous binder profiles, whereas constant high drying rates are unfavourable and result in accumulation of binder near the evaporation surface and depletion near the current collector. These results show strong qualitative agreement with experimental observations and provide a cogent explanation for why fast drying conditions result in poorly performing electrodes. Finally, a scheme is detailed for optimisation of a time-varying drying procedure that allows for short drying times whilst simultaneously ensuring a close to homogeneous binder distribution throughout the electrode.
Electrode drying, Binder migration, Mass transfer, Lithium-ion battery
0378-7753
177-185
Font, Francesc
c7c548a7-2678-4b71-843a-317734edfb0f
Protas, Bartosz
6eaf58f4-b584-498a-af16-cd2c3f1f289e
Richardson, Giles
3fd8e08f-e615-42bb-a1ff-3346c5847b91
Foster, Jamie
6b1c0d1d-d594-4495-963f-573f2f0d1d19
Font, Francesc
c7c548a7-2678-4b71-843a-317734edfb0f
Protas, Bartosz
6eaf58f4-b584-498a-af16-cd2c3f1f289e
Richardson, Giles
3fd8e08f-e615-42bb-a1ff-3346c5847b91
Foster, Jamie
6b1c0d1d-d594-4495-963f-573f2f0d1d19

Font, Francesc, Protas, Bartosz, Richardson, Giles and Foster, Jamie (2018) Binder migration during drying of lithium-ion battery electrodes: modelling and comparison to experiment. Journal of Power Sources, 393, 177-185. (doi:10.1016/j.jpowsour.2018.04.097).

Record type: Article

Abstract

The drying process is a crucial step in electrode manufacture that may lead to spatial inhomogeneities in the distribution of the electrode components resulting in impaired cell performance. Binder migration during the drying process, and the ensuing poor binder coverage in certain regions of the electrode, can lead to capacity fade and mechanical failure (e.g. electrode delamination from the current collector). A mathematical model of electrode drying is presented which tracks the evolution of the binder distribution, and is applicable in the relatively high drying rates encountered in industrial electrode manufacture. The model predicts that constant low drying rates lead to a favourable homogeneous binder profiles, whereas constant high drying rates are unfavourable and result in accumulation of binder near the evaporation surface and depletion near the current collector. These results show strong qualitative agreement with experimental observations and provide a cogent explanation for why fast drying conditions result in poorly performing electrodes. Finally, a scheme is detailed for optimisation of a time-varying drying procedure that allows for short drying times whilst simultaneously ensuring a close to homogeneous binder distribution throughout the electrode.

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Paper_batteries - Accepted Manuscript
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More information

Accepted/In Press date: 27 April 2018
e-pub ahead of print date: 12 May 2018
Published date: 31 July 2018
Keywords: Electrode drying, Binder migration, Mass transfer, Lithium-ion battery

Identifiers

Local EPrints ID: 420266
URI: http://eprints.soton.ac.uk/id/eprint/420266
ISSN: 0378-7753
PURE UUID: 735d5643-25a4-4043-9468-577c49505ab3

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Date deposited: 03 May 2018 16:30
Last modified: 26 Nov 2021 06:07

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Contributors

Author: Francesc Font
Author: Bartosz Protas
Author: Jamie Foster

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