Infrared particle detection for battery electrode foils

•Carbon coated copper foils were intentionally contaminated.•Specimen were excited by optical and near infrared radiation.•The specimen’s responses in the optical and mid wave infrared range were analyzed.•Infrared detection was found to provide improved detectability of particles. Failures of elect...

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Bibliographic Details
Published in:Infrared physics & technology 2013-11, Vol.61, p.254-258
Main Authors: Just, P., Ebert, L., Echelmeyer, T., Roscher, M.A.
Format: Article
Language:English
Subjects:
Coating
Contamination
Copper
Electrode inspection
Electrodes
Foils
Infrared
Inspection
Optical
Particle detection
Waviness
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Summary:•Carbon coated copper foils were intentionally contaminated.•Specimen were excited by optical and near infrared radiation.•The specimen’s responses in the optical and mid wave infrared range were analyzed.•Infrared detection was found to provide improved detectability of particles. Failures of electrochemical cells caused by internal shorts still are an important issue to be faced by the cell manufacturers and their customers. A major cause for internal shorts are contaminated electrode foils. These contaminations have to be detected securely via a non-destructive inspection technique integrated into the electrode manufacturing process. While optical detection already is state of the art, infrared detection of particles finds a new field of application in the battery electrode manufacturing process. This work presents two approaches focusing on electrode inspection by electromagnetic radiation (visible and infrared). Copper foils with a carbon based coating were intentionally contaminated by slivers of aluminum and copper as well as by abraded coating particles. Optical excitation by a flash and a luminescent lamp was applied at different angles in order to detect the reflected visible radiation. A laser impulse was used to heat up the specimen for infrared inspection. Both approaches resulted in setups providing a high contrast between contaminations and the coated electrode foil. It is shown that infrared detection offers a higher security thanks to its reliance on absorbance and emissivity instead of reflectivity as it is used for optical detection. Infrared Detection offers a potential since it is hardly influenced by the particle’s shape and orientation and the electrode’s waviness.
ISSN:1350-4495
1879-0275
DOI:10.1016/j.infrared.2013.08.017