Rate-dependent electrochemical strain generation in composite iron phosphate cathodes in Li-ion batteries

The performance of battery electrodes is significantly impacted by chemo-mechanical instabilities at faster charge/discharge rates. This study reports rate-dependent mechanical deformations in the LiFePO 4 cathodes during battery cycling by synchronizing in situ digital image correlation and electro...

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Bibliographic Details
Published inJournal of materials research Vol. 37; no. 19; pp. 3237 - 3248
Main Authors Ozdogru, Bertan, Murugesan, Vijayakumar, Çapraz, Ömer Özgür
Format Journal Article
LanguageEnglish
Published Cham Springer International Publishing 14.10.2022
Springer Nature B.V
Subjects
Applied and Technical Physics
Biomaterials
Cathodes
Chemistry and Materials Science
Cycles
Deformation
Digital imaging
Discharge
Electrodes
Inorganic Chemistry
Lithium-ion batteries
Materials Engineering
Materials research
Materials Science
Nanotechnology
Phase transitions
Pulsed current
Rechargeable batteries
Synchronism
Lithium iron phosphate
Rate-dependent deformations
Fast charging
Irreversible deformations
Digital image correlation
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Summary:The performance of battery electrodes is significantly impacted by chemo-mechanical instabilities at faster charge/discharge rates. This study reports rate-dependent mechanical deformations in the LiFePO 4 cathodes during battery cycling by synchronizing in situ digital image correlation and electrochemical techniques. The electrode undergoes larger mechanical deformations in the early cycles and irreversible strains become negligible in the subsequent cycles. Cumulative irreversible strains show a linear relationship with the square root of cycling time, and the slope of the cumulative irreversible strains is greater at faster rates. The study compares the irreversible strains in LiFePO 4 for Li-ion batteries with its analogous NaFePO 4 cathodes for Na-ion batteries. Rate-dependent mechanical deformations are reported as the LiFePO 4 electrode undergoes larger strains per capacity at faster rates. Pulsed current charge/discharge experiments coupled with strain measurements suggest a delay in the phase transformations at faster rates. The study provides new insights into rate-dependent chemo-mechanical deformations in the LiFePO 4 electrodes. Graphical abstract
ISSN:0884-2914
2044-5326
DOI:10.1557/s43578-022-00649-4