The cathode-electrolyte interface in the Li-ion battery

Edström, KristinaUppsala universitet,Institutionen för materialkemi,Strukturkemi,strukturkemi (author)

The same experimental techniques as used earlier to characterize the composition and properties of the so-called solid electrlyte interphase (SEI) layer formed at the graphite-anode-electrolyte interface of a Li-ion battery are used here to acquire some degree of understanding of face phenomena occurring on the cathode side of the cell, even though the validity of the SEI-layer concept is still somewhat tenuous "cathode" context. We here probe cathode-related SEI phenomena for the three cases: LiMujO^ LiCoOz/LiNio gCoo 202, and carboncoated LLFePCU. The various layer types formed have been analyzed systematically for different salts, solvents, cycling modes, storage temperatures, etc., using photoelectron spectroscopy (PES). Depth-profiling of the layers formed was achieved using Al Ka radiation th Ar-ion sputtering; non-destructive depth-profiling was made possible using synchrotron radiation, and applied to the important case of carbon-coated LiFePO4. A number of trends have emerged from our studies, and some general models are proposed to reflect features characteristic of the various systems studied. Our results are related to the more familiar SEI-layer formed on graphite.

Gustafsson, TorbjörnUppsala universitet,Institutionen för materialkemi,Strukturkemi,strukturkemi(Swepub:uu)tgu19364 (author)
Thomas, John OswaldUppsala universitet,Institutionen för materialkemi,Strukturkemi,strukturkemi(Swepub:uu)joshthom (author)
Uppsala universitetInstitutionen för materialkemi (creator_code:org_t)

By the author/editor: Edström, Kristin ...; Gustafsson, Torb ...; Thomas, John Osw ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

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