《Scanning micro X-ray fluorescence (μXRF) as an effective tool in quantifying Fe dissolution in LiFePO4 cells: towards a mechanistic understanding of Fe dissolution》 was written by Eldesoky, A.; Logan, E. R.; Johnson, M. B.; McFarlane, C. R. M.; Dahn, J. R.. Name: Vinylene carbonate And the article was included in Journal of the Electrochemical Society in 2020. The article conveys some information:
Lithium iron phosphate (LiFePO4, or LFP) is a widely used cathode material in Li-ion cells due to its improved safety and low cost relative to other materials such as LiNixMnyCozO2 (x + y + z = 1, NMC). To improve the calendar life of LFP cells, an investigation of their failure mechanisms is necessary. Herein, the scanning micro X-ray fluorescence (μXRF) is used to study Fe dissolution from LFP and deposition on the graphite electrode, which is thought to be a contributor to capacity fade. The impacts of the vinylene carbonate (VC) electrolyte additive, cycling conditions, and water content in the pos. electrode on Fe dissolution were studied. There was no significant correlation between Fe dissolution and capacity fade found. Furthermore, it is proposed that gas generation concomitant with Fe dissolution might be due to the reduction of the organic species coordinating Fe2+ when they reach the neg. electrode. Localized regions of increased Fe loading on the anode surface were found, which corresponded to regions with slight non-uniformities in stack pressure or c.d. This work demonstrates the effectiveness of μXRF in quantifying transition metal (TM) dissolution in Li-ion cells without any sample treatments that might mask valuable information such as element spatial distribution.Vinylene carbonate(cas: 872-36-6Name: Vinylene carbonate) was used in this study.
Vinylene carbonate(cas: 872-36-6) belongs to esters. Alkyl carbonates find applications as solvents for lithium ion battery electrolytes and the use of high quality battery grade electrolytes having extremely low water (<10 ppm) and acid (<10 ppm) contents are critical for achieving high electrochemical performance.Name: Vinylene carbonate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics