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ATO cathodes from Li-O2 cells in different states

The total amount of LiOH is quantified by titration with an aqueous solution of HCl using methyl red as an indicator while purging the titrant solution with argon to avoid the dissolution of atmospheric CO2. It has to be noted that dissolved CO2 from not only the atmosphere but also CO32− from Li2CO3, and partly CH3COO− and CHOO− from CH3COOLi and CHOOLi would add to the titrated amount of LiOH, whereas H2O2 does not affect the titration result (see Fig. S1 in the SI). Hence, the cumulative amount of Li2O, LiOH, Li2CO3, CH3COOLi, and CHOOLi can be determined as the difference between the amount of LiOH and other basic or weakly acidic species obtained from titration, and the amount of H2O2 determined by UV-vis (from Li2O2 only). As will be shown later, the formation of significant amounts of LiOH, Li2CO3, CH3COOLi, and CHOOLi during discharge can be excluded by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) analysis (Spectrum 2, Perkin Elmer, USA, equipped with a diamond ATR) of discharged electrodes, as all mentioned compounds possess intense characteristic IR absorption bands. Consequently, the amount of Li2O in discharged electrodes corresponds to the difference in titration and UV-vis results. If you are looking for high quality, high purity, and cost-effective ATO, or if you require the latest price of ATO, please feel free to email contact mis-asia.

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