Design and optimization of X-ray in-situ cells for lithium ion batteries studies

JORGE THOMAS; F. REQUEJO; VISINTIN A.; L.J. GIOVANETTI

Buenos Aires

Congreso; 20th Topical Meeting of the International Society of Electrochemistry Advances in Lithium and Hydrogen Electrochemical Systems for Energy Conversion and Storage; 2017

20th Topical Meeting of the International Society of Electrochemistry Advances in Lithium and Hydrogen Electrochemical Systems for Energy Conversion and Storage,

The entire comprehension of the processes that occurs during the use of a battery it is a powerful tool to improve the behavior of the cells of ion-Li batteries . But sometimes, these physicochemical processes cannot be detected by electrochemical measurements, and in the case of lithium ion batteries the possibility to make electrochemical experiments in a typical tree electrodes open cells joined to other chemical or physical techniques is quite impossible, due to the nature of the electrodes, electrolytes and working conditions of these type of batteries. For this reason we are developing an in-situ lithium ion battery cell system that is capable to work in typical current/potentials for these kinds of batteries inside of an X-rays absorption spectroscopy. Whit the developed new characterization system it is now possible to determined different anodic and cathodic active materials by X-ray spectroscopy techniques like XANES and EXAF at different working conditions i.e. different states of charge (SOC) or during a potentiodynamic running. Also it is possible to use the same battery setup in biggest facility as an synchrotron light source and obtain physical an chemical data whit more techniques and working at faster potentiodynamic experiments or higher current conditions. In this work we are presenting preliminary results of the in-situ system working in a Rigaku X-ray Absorption equipment with cathodic active materials at different conditions.The Figure 1(a) is a picture of the in-situ cell ensemble (inside of the adapter) ready to work in the X-ray spectrometer and (b) charge-discharge potential profile of the cell. Also the obtained XANES spectra of the cell at different states of charge