Equipment, AAP 2017-1
Project leader : Alexis Grimaud
The development of energy storage and conversion systems such as high performance batteries, supercapacitors or electrolyzers/fuel cells currently hampers the deployment of renewable energies. In a systematic manner, high energy devices such as Li-O2 or Li-S that are proposed to replace Li-ion batteries that are currently powering electrical vehicles all suffer from poorly controlled interfaces and the release of highly reactive soluble species that limit the performances of such systems. To solve this issue, a change in paradigm is necessary with emphasis being paid on the understanding of phenomena occurring in solution. In this project, we propose to use metal organic frameworks (MOFs) in order to selectively capture these soluble species. Coupling the use of these porous materials which basic or acidic properties can be tuned in order to selectively capture cations or anions, respectively, with in situ detection using UV-Vis and IR spectroscopy, new strategies will be developed to mitigate these issues and further enhance the performances of the next generation of electrochemical energy storage devices. These strategies will be applied to 1) the study in operando of the formation of soluble species formed at the negative carbon side during operation of Na-ion batteries by their reaction with the MOF open structure, 2) the detection of soluble transition metals formed at high potential upon gaseous oxygen release for Li-rich layered compounds for Li-ion batteries and 3) the detection in situ of singlet oxygen generated during cycling of Li-O2 batteries by functionalization of the pores of MOFs structure.