Nondestructive Depth Profiling of the Solid Electrolyte Interphase on LiFePO4 and Graphite Electrodes
2010 (English)In: ECS Transactions, ISSN 1938-5862, Vol. 25, no 36, 121-127 p.Article in journal (Refereed) Published
This study describes a method for non-destructive depth profiling of the electrode/electrolyte interphase in lithium-ion batteries. Photoelectron spectroscopy (PES) measurements using four different excitation energies in the 175 - 6900 eVrange from two synchrotron sources (MAXlab and BESSY) was conductedon the surface of cycled LiFePO4 and graphite electrodes. Thus the surfaces were probed at four different depths in the1-15 nm range without using sputtering, which is advantageous since sputtering has been shown to change the surface chemical composition.The results of this study suggest that the solid electrolyteinterphase (SEI) on the cathode side, in addition to some salt products, also consists of some oxidized electrode components, while the SEI on the anode side mainly consists of solvent decomposition products, as expected. Finally, it is noted that wewith this method can "see through the SEI layer" into the bulk also on the anode side.
Place, publisher, year, edition, pages
The Electrochemical Society , 2010. Vol. 25, no 36, 121-127 p.
Research subject Chemistry with specialization in Inorganic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-139516OAI: oai:DiVA.org:uu-139516DiVA: diva2:381504