DEvelopment of Organic batteries with Solid-State electrolytes – DEOSS

We will exploit properties of promising low molecular weight EOMs through the use of solid electrolytes. In order to tackle such an ambitious goal we gather French specialists of EOMS and Solid-State Electrolytes: LG2A (Amiens), IMN (Nantes), LRCS (Amiens), IPREM (Pau). Our scientific approach will allow the evaluation of multiple cell configurations using organic electrodes. We will evaluate the use of EOMs together with classical sulfide Solid-Electrolytes with both EOM/Li and EOM/EOM configuration. Simultaneously our efforts will be also devoted to the preparation and assessment of new organic materials like ionic-Covalent Organic Frameworks or lamellar compounds, able to act as solid electrolytes. Then EOM/Li and EOM/EOM cells will be assembled with the best organic ionic conductor materials and evaluated. These strategies will be associated with a systematic interphase study using crossed technics at our disposition through our consortium (SEM, XPS, ToF-SIMS, STEM-EELS). Thus, the insights gained will guide us toward improvement of the first cells. Finally, our working plan should offers us the possibility to assemble an organic all-solid-state battery characterized by an energy density of ~ 50 Wh/kg, before loading optimization.

The DEOSS project has been negatively impacted by the COVID-19 crisis and therefore all the tasks have to be rescheduled. Nevertheless, we have assessed a first family of COFs from the litterature as solid state ionic conductors. In parallel, argyrodite was used as solid state electrolyte with a serie of organic test molecules.

As soon as possible, we will start to evaluate organic lamellar compouns as solid state ionic conductors. Based on the knowldge gained during our first studies, we have designes our own COFs and we will start to evaluate vers ionic conducting properties in the next few months. Concerning argyrodite, a second optimized serie of testing will start soon.

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The basic research project, DEOSS, aims at developing the use of Solid-State Electrolytes together with Electroactive Organic Materials (EOMs) as electrodes in organic batteries. The DEOSS project is therefore at the crossroads of different issues, namely: i) research for efficient, safe, eco-compatible means for reversibly storing electrical energy, ii) the implementation, for these purposes, of organic electrodes and iii) the use of solid electrolytes. Basically, the implementation of Electroactive Organic Materials (EOMs) in secondary batteries has recently (since the 2000’s) attracted renewed interest. EOMs’ properties differs firmly from the ones of their inorganic counterparts and their use feet well with today’s energy and environmental issues. In fact, EOMS are composed of abundant elements (C, H, O, N), they present usually multi-electrons reactions, multiple cell designs are possible and some physical flexibility of the cells are reported. It has also been recognized that use of EOMs could lower environmental impact of the cells and offer a better recyclability. However, reports on full organic batteries are still scarce in the literature without speaking of their absence on the market. Particularly the use of low molecular weight EOMs presenting the highest specific capacities is still hampered by their solubility issues in common liquid battery electrolytes. On the other hand researches concerning Solid-State Electrolytes for safer secondary batteries rise rapidly. Not to mention that such a technology give the possibility to use lithium as the anode. The originality of the DEOSS project is to promote both researches areas. We will exploit properties of promising low molecular weight EOMs through the use of solid electrolytes. In order to tackle such an ambitious goal we gather French specialists of EOMS and Solid-State Electrolytes: LG2A (Amiens), IMN (Nantes), LRCS (Amiens), IPREM (Pau). Our scientific approach will allow the evaluation of multiple cell configurations using organic electrodes. We will evaluate the use of EOMs together with classical sulfide Solid-Electrolytes with both EOM/Li and EOM/EOM configuration. Simultaneously our efforts will be also devoted to the preparation and assessment of new organic materials like ionic-Covalent Organic Frameworks or lamellar compounds, able to act as solid electrolytes. Then EOM/Li and EOM/EOM cells will be assembled with the best organic ionic conductor materials and evaluated. These strategies will be associated with a systematic interphase study using crossed technics at our disposition through our consortium (SEM, XPS, ToF-SIMS, STEM-EELS). Thus, the insights gained will guide us toward improvement of the first cells. Finally, our working plan should offers us the possibility to assemble an organic all-solid-state Li-battery characterized by an energy density of ~ 50 Wh/kg, before loading optimization.