Diffusion-Induced Transient Stresses in Li-Battery Electrodes Imaged by Electrochemical Quartz Crystal Microbalance with Dissipation Monitoring and Environmental Scanning Electron Microscopy

Netanel Shpigel, Mikhael D. Levi, Xiaopeng Cheng, Tianci Cao, Rui Wu, Tyler S. Mathis, Yuefei Zhang, Doron Aurbach, Yury Gogotsi

Research output: Contribution to journalReview articlepeer-review

17 Scopus citations

Abstract

Quick charging of Li-ion batteries is often accompanied by rapid expansion of composite battery electrodes, resulting in the appearance of transient stresses inside the electrodes' bulk. Although predicted theoretically, they have never been tracked by direct in situ measurements. Herein, using multiharmonic electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D), acoustic images of strong transient deformations in LiFePO4 electrodes were obtained in the form of giant resonance frequency and resonance width shifts. The formation of cracks was verified by scanning electron microscopy. The effects of charging rate, stiffness of the polymeric binder, and solution concentration have been identified. The attractive feature of EQCM-D is its high sensitivity for selective probing of average mechanical characteristics of the operated electrodes, especially of the particle-binder interactions, directly linked to the electrode cycling performance. Using EQCM-D, an inexpensive, simple, and fast method of structural health monitoring for battery electrodes can be intelligently designed.

Original languageEnglish
Pages (from-to)1907-1917
Number of pages11
JournalACS Energy Letters
Volume4
Issue number8
DOIs
StatePublished - 9 Aug 2019

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.

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