Lithium-ion batteries submitted to high voltage:
Using surface characterization techniques to reveal interfacial behaviors depending on the electrolyte chemistry
Workplace: IPREM Laboratory in Pau, and SAFT in Bordeaux, Nouvelle-Aquitaine, France.
Keywords: High voltage battery, electrolyte formulation, polymer, electro- and interfacial chemistry, surface analysis
SAFT, world leader in industrial and specialty batteries, develops long-lasting batteries for demanding applications, such as in space exploration or military use where the environmental conditions can range from extreme heat to extreme cold. As for lithium-ion batteries, it is then essential to control both the interfacial and electrolyte chemistries in order to deliver high power and/or energy when requested. This project aims at investigating innovative electrolyte for new cell chemistries, that will be designed together for high voltage and power applications. Advanced surface characterization techniques will be focusing on determining interfacial behavior depending on environmental and cycling conditions.
Position and assignments
Electrolyte composition (solvents, lithium salts, additives, polymers) is a key parameter for Li-ion cells to deliver the best performance which needs to be modulated depending on the final application and environment. The objective of this PhD program is then to implement the adequate electrolyte chemistry in order to provide the best performance for Li-ion cells that comprise a high cutoff voltage cathode material (spinel and Li-rich rock salt types) paired with a high voltage anode: LTO- or TNO-based. This suggests that the successful electrolyte will be stable at high potential (> 4.7 V vs Li), as well as in the working potential range of the titanium-based electrode (1.5-1.0 V vs Li). Interfacial behavior in these demanding conditions is to be fully understood by means of surface characterization techniques, such as XPS (X-ray Photoelectron Spectroscopy), Auger electron spectroscopy and ToF-SIMS (Time-of-Flight Secondary Ion Mass Spectrometry); more precisely, a methodological approach will be developed to investigate the potentiality of a new “Tandem MS” analyzer (installed on the ToF-SIMS machine by the end of 2019) for the identification and localization of high mass molecules that are present at the electrode/electrolyte interfaces; innovative analysis/sputtering gun using C60 clusters will also be tested. At the same time, fine understanding of ageing mechanisms will be studied by means of electrochemical techniques (EIS, chronoamperometry, CC-CV cycling etc…) that are available at SAFT. Surface characterization of interfaces will be carried out at IPREM (Pau).
3 years, starting January 2020
Gross salary: 1900€ per month
The applicant will have the following background and expertise:
If you feel you have the right skills, experience and enthusiasm to join our team, please apply using this form.
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