Wiki article for the KPI: Layer thickness homogeneity of the calendered electrode film

Measuring the layer thickness homogeneity of the calendered electrode film is crucial to ensure uniformity and consistency in battery production. Here are some of the most important measuring techniques for determining the layer thickness homogeneity of the calendered electrode film, along with relevant standards and references for each technique:

Measuring technique 1: Optical Profilometry:

Description: Optical profilometry is a non-contact surface metrology technique that measures surface height variations. It can be used to scan the calendered electrode film's surface and generate a three-dimensional map of the layer thickness distribution, allowing for the assessment of layer thickness homogeneity.

Relevant Standard: There is no specific standard solely dedicated to optical profilometry for measuring the layer thickness homogeneity of calendered electrode films in battery production. However, guidelines for optical surface metrology can be considered, such as ISO 25178-2:2021 - Geometrical product specifications (GPS) -- Surface texture: Areal -- Part 2: Terms, definitions, and surface texture parameters (https://www.iso.org/standard/74591.html).

Reference: "Handbook of Optical Metrology: Principles and Applications" Second Edition, edited by Toru Yoshizawa, published 2017 (ISBN: 9781138893634). https://books.google.de/books/about/Handbook_of_Optical_Metrology.html?id=QpkuDwAAQBAJ&redir_esc=y

Measuring technique 2: Cross-Sectional Analysis:

Description: As mentioned earlier, cross-sectional analysis involves cutting a sample of the calendered electrode film and then using microscopy or imaging techniques to examine the layer thickness at various locations on the film. This technique allows for the evaluation of layer thickness homogeneity along the cross-section of the film.

Relevant Standard: There is no specific standard solely dedicated to cross-sectional analysis for measuring the layer thickness homogeneity of calendered electrode films in battery production. However, guidelines for sample preparation and microscopy analysis can be considered, such as ISO 25178-70:2014 - Geometrical product specifications (GPS) -- Surface texture: Areal -- Part 70: Calibration and measurement of areal surface texture parameters (https://www.iso.org/standard/57688.html).

Reference: "Handbook of Microscopy: Applications in Materials Science, Solid-State Physics, and Chemistry, Applications" S. Amelinckx and et. al. (ISBN: 978-3-527-62075-3).

Unit for Layer Thickness Homogeneity: The layer thickness homogeneity is typically assessed qualitatively or quantitatively using statistical measures such as standard deviation, coefficient of variation, or range. The unit for these statistical measures is the same as the unit for the layer thickness itself, which is commonly expressed in units of micrometres (μm) or nanometres (nm).

It's important to note that the choice of measuring technique for layer thickness homogeneity may depend on factors such as the required resolution, the specific characteristics of the calendered electrode film, and the specific requirements of the battery production process. Manufacturers may adopt in-house methods or follow industry-specific guidelines to ensure accurate measurement of the layer thickness homogeneity in the calendered electrode film during battery production. For specific applications and guidelines related to layer thickness homogeneity measurement in battery production, you may refer to research papers and guidelines published by battery manufacturers and research institutions in the field of battery technology.

This content was generated with the assistant of GhatGPT and was reviewed by battery scientists. If you have suggestions for further improvements, or you use other measuring techniques, standards, and protocols in your lab, please reach out to us and send a mail to info@celest.com. Together we can improve this knowledge base even more.