Yao, X; Gorman, D; Chatzopoulos, G; Kubiak, P; Sun, W (2025) Development of reference standards for metrological evaluation of battery electrode misalignment using X-ray computed tomography. Journal of Energy Storage, 132. 117835 ISSN 2352152X

Full text not available from this repository.

Abstract

X-ray computed tomography (XCT) is an effective technique for the non-destructive evaluation of structural defects, which can be used for quality assurance in battery cell manufacturing and inspection. In recent years, there has been an increasing demand to use XCT for dimensional evaluation. However, the development of XCT for dimensional metrology is still in the early stages. Gaining confidence in XCT measurement results requires calibration activities tailored to the specific application. One feasible approach to calibrating XCT and determining the uncertainty of its measurements in the battery field is to develop a reference standard that emulates the geometry of battery cells. In this study, we designed and manufactured a reference object that replicates the geometric features of a battery assembly. The primary measurand is the perpendicular distance between the edges of the cathode and anode, referred to as the overhang distance. The reference object was created using computer numerical control laser cutting technology to machine commercial graphite anode and lithium ferro phosphate cathode electrode sheets. Confocal laser scanning microscopy was employed to establish reference values for the distances. Fiducial markers, which can be accessible using both optical and XCT techniques, were considered in the design that allow for the precise location of the measurement area of interest. By comparing XCT results against these reference values, quantitative evaluation of cell structures using XCT can be achieved. This reference object and calibration methodology could facilitate a quantitative assessment of the internal structures of battery cells using XCT and shorten the inspection time required for quality assurance tasks.

Item Type:	Article
Subjects:	Engineering Measurements > Dimensional
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.1016/j.est.2025.117835
Last Modified:	03 Jul 2026 09:45
URI:	https://eprintspublications.npl.co.uk/id/eprint/10473