A Paradigm of Calendaring‐Driven Electrode Microstructure for Balanced Battery Energy Density and Power Density

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A Paradigm of Calendaring‐Driven Electrode Microstructure for Balanced Battery Energy Density and Power Density
Title:
A Paradigm of Calendaring‐Driven Electrode Microstructure for Balanced Battery Energy Density and Power Density
Journal Title:
Advanced Energy Materials
Publication Date:
23 November 2022
Citation:
Zhan, R., Ren, D., Liu, S., Chen, Z., Liu, X., Wang, W., Fu, L., Wang, X., Tu, S., Ou, Y., Ge, H., Wong, A. J. Y., Seh, Z. W., Wang, L., & Sun, Y. (2022). A Paradigm of Calendaring‐Driven Electrode Microstructure for Balanced Battery Energy Density and Power Density. Advanced Energy Materials, 13(2), 2202544. Portico. https://doi.org/10.1002/aenm.202202544
Abstract:
The microstructure of an electrode plays a critical role in the electrochemical performance of lithium-ion batteries, including the energy and power density. Using a micrometer-scale Wadsley–Roth phase TiNb2O7 active material with Li intercalation chemistry as a model system, the relationship between electrochemical performance and microstructure of calendared electrodes with same mass loading but different electrode parameters is studied by both experimental investigation and theoretical modeling, providing a paradigm of calendaring-driven electrode microstructure for balanced battery energy density and power density. Along with the reduction in porosity, ion and electron diffusion distance decreases, which is beneficial for charge transfer and rate capability. Nevertheless, the narrowed ion diffusion pathway increases the resistance for ion diffusion. The rate capability, volumetric capacity, and materials utilization are thus predominantly restricted by the microstructures of the electrode, providing fundamental insights into electrode microstructure design for different applications. As an example, an optimized TiNb2O7 electrode with compaction density of ≈2.5 g cm-3 and mass loading of ≈8.5 mg cm-2 provides the highest specific charge capacity of 271.3 mAh g-1 at 0.2 C in half cell configuration and 70.4% capacity retention at 6 C in full configuration, enabling balanced energy density and power density of batteries.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the National Research Foundation - NRF Fellowship
Grant Reference no. : NRF-NRFF2017-04

This research is supported by core funding from: SERC
Grant Reference no. : NA

This work is financially supported by National Natural Science Foundation of China (No. 52072137).
Description:
This is the peer reviewed version of the following article: Zhan, R., Ren, D., Liu, S., Chen, Z., Liu, X., Wang, W., Fu, L., Wang, X., Tu, S., Ou, Y., Ge, H., Wong, A. J. Y., Seh, Z. W., Wang, L., & Sun, Y. (2022). A Paradigm of Calendaring‐Driven Electrode Microstructure for Balanced Battery Energy Density and Power Density. Advanced Energy Materials, 13(2), 2202544. Portico. https://doi.org/10.1002/aenm.202202544 , which has been published in final form at doi.org/10.1002/aenm.202202544. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
ISSN:
1614-6840
1614-6832
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