Operando confocal microscopy to analyse volume expansion of Solid State Microbatteries

Lara Casiez (1) , Christophe Secouard (1) , Jacopo Cele (1) , Jean-Philippe Colonna (1) , Alberto Aguerri (2) , Sandra de Pedro (2) , Sami Oukassi (1)

1 DCOS - Département Composants Silicium
2 Sensofar Sensofar

The rise of embedded objects put great interests in miniaturized power supply solutions. Solid State Microbatteries (SSM) are the most promising, as they can safely store high energy and power density. SSM have the advantage of being all-solid (no liquid leakage and flammability), to have low self-discharge and good cyclability. Despite the strong interest in the field, the mechanisms of Li plating and stripping at the anode are not well observed and not yet fully understood [1]. The study of these phenomena would bring new insights to mechanical behavior during cycling and therefore may lead to optimization approaches at the cycle life level. In this purpose, we investigated the morphological change of SSM during the charge/discharge cycle. We looked at the influence of the cathode thickness and the packaging. Thick LiCoO2 layers were used for the study with thickness from 5 to 30 µm. Volume variations upon cycling were followed thanks to a Neox microscope 3D (Sensofar) and were correlated to charge/discharge capacity

Domaines: Physique [physics]

Lara Casiez, Christophe Secouard, Jacopo Cele, Jean-Philippe Colonna, Alberto Aguerri, et al.. Operando confocal microscopy to analyse volume expansion of Solid State Microbatteries. 244th ECS Meeting, Oct 2023, Göteborg, Sweden. ⟨cea-04539850⟩