the nano-tomographic reconstruction of one sample made of alumina-nanopourous template filled with Bi2Te3 will be acquired to study the morphological distribution of the thermoelectric material. This 3D information will be used in a finite element model to simulate the thermal properties of the sample. In parallel, 2/3 samples coming from the delithiated SiO anodes extracted from pristine and cycled lithium-ions batteries will be reconstructed with high resolution to investigate the particles microstructural evolution after ageing.