Researchers from RS2E/ALISTORE have analysed the main studies on inorganic solid-state electrolytes to get a better understanding of their properties.
A Franco-British team, LRCS/University of Bath, has published a comprehensive review on inorganic solid-state electrolytes, essential elements for the good performances of the all solid-state batteries.
The study aims to aggregate current knowledge in three research areas needed to control these electrolytes: Multiscale ion transport, electrochemical and mechanical stabilities and processing methods available. Deeper insights about these topics has been gained through the synergy between experimental and modeling techniques.
In choosing these areas of interest, the review plans to address to the top three current challenges in research on all solid-state batteries. Firstly, the utilization of metal anodes, which have excellent theoretical performance, is slowed down by the inhomogeneous electrodeposition of alkali metals (Li, Na, etc.) through the solid electrolyte. Secondly, the electrolyte/electrodes interfaces are still unstable and poorly known: Interphases form at these locations and interfere with ionic and electronic conduction. Eventually, the electrochemical degradation and the mechanical deformation of the all solid-state batteries under use diminish the physical contact between the different layers, reducing the performances of the energy storage systems proposed.
The full article, published the 19th August 2019, is available in the journal Nature Materials.
The deputy director of RS2E was awarded for his internationally recognized works.
Patrice Simon, RS2E deputy director and professor in material science at University Toulouse III – Paul Sabatier obtained the Pierre Süe Grand Prix from the French Chemical Society (SCF).
This prize awards world-class works that corresponds which are part of the activities of the SCF. The Board of Directors of the SCF, a non-profit organization, recognized for its public utility, whose goal is to promote chemistry, has been giving this award every year since 1974.
Several prizes already distinguish Patrice Simon: The CNRS silver medal* in 2015 and the Brian Conway Prize of Physical Electrochemistry of the International Society of Electrochemistry in 2018.
*Links in French
Works of RS2E researchers provide vital guidelines for designing energy efficient disordered rock salt cathode materials.
A mixed Collège de France/ ICGM team, helped by scientists from the Paul Scherrer Institute and the University of Illinois, tried to understand the low energy efficiency of electrode materials with high capacity.
Thanks to an arsenal of analytical techniques, the researchers studied the charging/discharging behavior of two model disordered rock salt materials: Li1.3Ni0.27Ta0.43O2 and Li1.3Mn0.4Ta0.3O2.
The observations, coupled with theoretical calculations, show that the voltage drops in materials based on nickel (Ni), can be explained by modifications of the energy states of different chemical element and structural modification. These changes trigger O2 release and hysteresis (important voltage difference between charge/discharge). In light of these results, the researchers proposed a correlation between the hysteresis and the charge transfer gap.
All the results can be read in the article published in the journal JACS (Journal of the American Chemical Society).
DOI : 10.1021/jacs.8b11413
At the end of May, the EMRS-2019 Spring meeting was hold in Nice. At this occasion, a RS2E PhD student won an award for her excellent oral presentation.
Charlotte Bodin, from the Charles Gerhardt Institute in Montpellier (ICGM), was awarded the first Nature Energy Award for her oral presentation titled "Biredox Ionic Liquids: New Opportunity For High Energy Supercapacitors" during the EMRS-2019 Spring meeting (May 27 - 31).
The young researcher is in her 3rd year of thesis, funded by the RS2E, under the supervision of Olivier Fontaine and Frederic Favier (ICGM) and in collaboration with Patrice Simon and Pierre-Louis Taberna, from the CIRIMAT in Toulouse. Her works (in French) are about a new generation of binders and electrolytes based on ionic polymerized liquid and open the way to flexible and self-healing supercapacitors.
The use of the Electrochemical Quartz Crystal Microbalance (EQCM) was a key element in her researches to demonstrate and understand the specific interactions between the electrode and the redox molecules. These results have impacts over the supercapacitors because they may help to explicit the redox mediators in others energy storage systems as the lithium-ion, lithium-air and lithium-sulfur batteries.
The BPI (French Public Investment Bank) will host at the end of the month a business workshop for all the professionals from the battery world.
The BPI organizes May 28th, with the support of the RS2E, a workshop on batteries. This meeting will address the main trends of market, innovation and R&D, the industrial challenges and the initiatives from the European commission in the context of the European Battery Alliance.
The meeting will take place from 9:00 am to 5:00 pm at BPIfrance Hub, 6-8 boulevard Haussmann, near the Richelieu-Drouot subway station.
You can find the program and sign up here.