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The current trend in various energy applications, ranging from batteries to electrolizers, lays in the control of physicochemical and morphological properties of materials and their interfaces. Just to give some peculiar examples, due to their insulating nature (e.g. LiFePO4) or their dramatic volume changes (e.g. Si) many materials have been disregarded for decades in battery applications. Nowadays, through nanostructuring and surface coating, LiFePO4 and Si have become among the most promising materials for the next generation batteries that might power our cars. Nanostructuring gave also a new hope to technologies that were discarded such as Li-Air and Li-S.