X-ray computer tomography investigations on solid-state lithium-ion battery system

Gainov, Ramil; Forschungszentrum Julich; Germany

Gainov, R.R.; Forschungszentrum Jülich GmbH; Germany
Yu, S.; Forschungszentrum Jülich GmbH; Germany
Pauly, F.; Forschungszentrum Jülich GmbH; Germany
Tempel, H.; Forschungszentrum Jülich GmbH; Germany
Kungl, H.; Forschungszentrum Jülich GmbH; Germany
Eichel, R.-A.; Forschungszentrum Jülich GmbH; Germany
Natour, G.; Forschungszentrum Jülich GmbH; Germany

ID: ECNDT-0347-2018
Download: PDF
Session: CT-Applications 4
Room: G3
Date: 2018-06-13
Time: 15:40 - 16:00

Forschungszentrum Jülich is one of Europe’s largest interdisciplinary research centers, working in many scientific areas. The Institute of Energy and Climate – Fundamental Electrochemistry (IEK-9) focuses on the development of materials for electrochemical storage and energy conversion. The Central Institute for Engineering, Electronics and Analytics – Engineering and Technology (ZEA-1) has capabilities in mechanical and electronics development, as well as analytical services. The development of measurement and testing methods is one of the ZEA-1 focus areas.

Solid-state lithium-ion batteries are an emerging topic in the field of battery research because these materials promise to solve safety issues in current lithium-ion batteries. One of the critical problem for this system is volume expansion/contraction of active materials like anode and cathode, which may impede their direct incorporation into solid-state batteries.

The scientific problem under this study is experimental investigation of cracks formation and evolution in a bulk-type solid-state battery during different loads and at different electrochemical stages. It appears that the one suitable approach is an application of non-destructive method of X-ray computed tomography (CT). With the help of CT, we are able to detect the issue of possible cracks propagation and their characterization in the solid electrolyte material. The morphology of the interfaces of battery components are also the topic of current studies. This could help to find the optimal correlation between mechanical and electrochemical properties for the practical application of solid-state battery.

To carry out the measurement noted above, the newly upgraded industrial CT equipment at the Institute ZEA-1 was applied. The preliminary ex-situ studies of first prototypes of cycled batteries by X-ray CT have indeed found clearly the appearance of cracks in the volume. In-situ measurements during cycling will be performed. The visualized correlations of electrochemical properties, microstructure and mechanical characteristics of bulk-type solid-state batteries are presented and discussed.