Keywords

Microphones, Acoustic phenomena, Condensers, Dielectric materials, Elastic modulus, Numerical methods, Lasers, Vibrometer, Chemical elements, Batteries

Abstract

Measurements of the mechanical properties of lithium-ion battery electrode films can be used to quantify and improve manufacturing processes and to predict the mechanical and electrochemical performance of the battery. This paper demonstrates the use of acoustic resonances to distinguish among commercial-grade battery films with different active electrode materials, thicknesses, and densities. Resonances are excited in a clamped circular area of the film using a pulsed infrared laser, and responses are measured using an electret condenser microphone. A numerical model is used to quantify the sensitivity of resonances to changes in mechanical properties. When the numerical model is compared to simple analytical models for thin plates and membranes, the battery films measured here trend more similarly to the membrane model. Resonance measurements are also used to monitor the drying process. Results from a scanning laser Doppler vibrometer verify the modes excited in the films, and a combination of experimental and simulated results is used to estimate the Young's modulus of the battery electrode coating layer.

Original Publication Citation

Kathryn L. Dallon, Jing Yao, Dean R. Wheeler, Brian A. Mazzeo; Characterization of mechanical properties of battery electrode films from acoustic resonance measurements. J.

Document Type

Peer-Reviewed Article

Publication Date

2018-04-02

Publisher

American Institute of Physics

Language

English

College

Ira A. Fulton College of Engineering

Department

Chemical Engineering

University Standing at Time of Publication

Full Professor

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