Effect of calendering on rate performance of Li4Ti5O12 anodes for lithium-ion batteries

Lithium titanate (LTO) anodes despite their low specific capacity of 175 mAhg −1 from a low volume change and intercalation voltage of 1.55 V vs lithium are excellent for automotive applications requiring fast and safe charging at times like regenerative braking. The present study focuses exclusivel...

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Bibliographic Details
Published in:Journal of electroceramics 2020-11, Vol.45 (3), p.85-92
Main Authors: Acharya, Truptimayee, Chaupatnaik, Anshuman, Pathak, Anil, Roy, Amritendu, Pati, Soobhankar
Format: Article
Language:English
Subjects:
Aluminum
Anode effect
Anodic coatings
Calendering
Ceramics
Characterization and Evaluation of Materials
Charging
Chemistry and Materials Science
Coated electrodes
Composites
Crystallography and Scattering Methods
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemistry
Flux density
Glass
High temperature
Lithium
Lithium-ion batteries
Materials Science
Metal foils
Natural Materials
Optical and Electronic Materials
Rechargeable batteries
Weight reduction
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Summary:Lithium titanate (LTO) anodes despite their low specific capacity of 175 mAhg −1 from a low volume change and intercalation voltage of 1.55 V vs lithium are excellent for automotive applications requiring fast and safe charging at times like regenerative braking. The present study focuses exclusively on the effect of calendering on the charging rate of LTO anodes. Calendering is a process where the current collector coated with the electrode, both anode, and the cathode is passed between two rolls at an elevated temperature to compact and improve the electrode’s energy density and electrochemical performance. The anode, LTO coated on aluminum foil current collector, calendered at about 42% (i.e. reducing the thickness of uncalendered anode from ~175 to ~100 μm) showed exceptional capacity retention even at 10C rate. Rate performance analyses reveal that calendering improves the capacity at high C-rate, whereas it doesn’t impact significantly at low C-rate. Electrochemical impedance spectroscopy measurements show that the resistive losses decrease with calendering.
ISSN:1385-3449
1573-8663
DOI:10.1007/s10832-020-00227-2