Rechargeability of discharge products of ATO


The charging potential consists of three distinct regions: (i) a first plateau around 3.3 V, (ii) a sloping potential until ∼5 V, and (iii) a second plateau around 5.2 V. Product analyses during charge will be discussed using the amounts normalized to O2 equivalents to facilitate the comparison with the OEMS data presented in the next section. Li2O2 is almost completely removed from the electrode surface at potentials below 5 V: Out of 2.26 ± 0.32 μmolO2/(As) at SOC #1, only 0.24 ± 0.02 μmolO2/(As) remain on the electrode at SOC #2. Thus 2.02 ± 0.34 μmolO2/(As) are removed. For Li2O, these numbers are more ambiguous: Out of 1.10 ± 0.32 μmolO2/(As) at SOC #1, 0.77 ± 0.04 μmolO2/(As) are still present at SOC #2, which translates to 0.33 ± 0.36 μmolO2/(As) being removed. Although it is clear that a fundamental fraction of Li2O remains on the electrode surface, anything between zero and half of the initial amount could be removed, considering the error of measurement. According to these findings, 2.35 ± 0.70 μmolO2/(As) of oxygen should be generated during charging to SOC #2. This is to be confirmed by OEMS analysis in the following section. During recharge to the cell's 1st discharge capacity, i.e., covering the charging plateaus around 3.3 and 5.2 V, all discharge products are almost completely decomposed: 0.01 ± 0.01 μmolO2/(As) of Li2O2 and 0.04 ± 0.05 μmolO2/(As) of Li2O, so virtually no Li2O2 and no or very few Li2O, are found on the electrode surface at SOC #3. Again, the total of 1.01 ± 0.06 μmolO2/(As) these reactions should generate is to be confirmed by OEMS in the following section. 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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