A multi-technique approach to understanding delithiation damage in LiCoO2 thin films.

Scientific Reports
E SalagreC Polop

Abstract

We report on the delithiation of LiCoO2 thin films using oxalic acid (C2H2O4) with the goal of understanding the structural degradation of an insertion oxide associated with Li chemical extraction. Using a multi-technique approach that includes synchrotron radiation X-ray diffraction, scanning electron microscopy, micro Raman spectroscopy, photoelectron spectroscopy and conductive atomic force microscopy we reveal the balance between selective Li extraction and structural damage. We identify three different delithiation regimes, related to surface processes, bulk delithiation and damage generation. We find that only a fraction of the grains is affected by the delithiation process, which may create local inhomogeneities. However, the bulk delithiation regime is effective to delithiate the LCO film. All experimental evidence collected indicates that the delithiation process in this regime mimics the behavior of LCO upon electrochemical delithiation. We discard the formation of Co oxalate during the chemical extraction process. In conclusion, the chemical route to Li extraction provides additional opportunities to investigate delithiation while avoiding the complications associated with electrolyte breakdown and simplifying in-sit...Continue Reading

References

Aug 24, 2004·Nature Materials·C A MarianettiG Ceder
May 17, 2007·The Review of Scientific Instruments·I HorcasA M Baro
Apr 22, 2015·Journal of Hazardous Materials·Xianlai ZengBingyu Shen
Jan 2, 2016·The Journal of Physical Chemistry Letters·Veronica Augustyn, Arumugam Manthiram
Jan 3, 2020·ACS Nano·Joshua P PenderC Buddie Mullins

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