Photo2Batt aims at the emergence of innovative energy-related technologies situated at the frontier research between material sciences and supramolecular chemistry. It is a proposal offering a good balance between fostering new fundamental knowledge and a disruptive concept applied to solar energy. It integrates a number of leading concepts in the fields of electrochemistry and photo-electrochemistry in association with robust expertise in both dye-sensitized solar cells and lithium-ion batteries. At the meeting point between these two, the core of this proposal targets the utilisation of light-induced charge separation in the space charge layer of n and p-semi-conducting insertion materials to onset a quantitative battery photorecharge reaction (1st pillar research) and the tailoring of smart hybrid conversion/storage molecular assembly through the development of very specific donor/acceptor chromophores suited to n and p-type insertion materials (2nd pillar research). These two research pillars will be supported by a more fundamental oriented workpackage aiming at improving community knowledge about the (photo)electrochemical interface between redox active semi-conductor and ionic conductive electrolyte, free of any redox couple. Photo2Batt intends to develop a new box into the research panorama, embracing fundamental research in semi-conductor physics and the tailoring of smart materials. The combination of conversion and storage functionality at a molecular level will offer a robust key to one of the main energetic challenge Human needs urgently to tackle, making use and stabilize technologically the electricity output from intermittent sun power. With its multidisciplinary approach, we strongly believe Photo2Batt gathers a perfect cocktail to cultivate totally new fundamental and technological concepts which will allow France closing the technological and scientific gap in nanoscience and photoelectrochemistry while establishing a new scientific world-lead in renewable energy exploitation.