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Lenard Hanf Jonas Henschel Marcel Diehl Martin Winter Sascha Nowak 《Electrophoresis》2020,41(9):697-704
A new CE method with ultraviolet–visible detection was developed in this study to investigate manganese dissolution in lithium ion battery electrolytes. The aqueous running buffer based on diphosphate showed excellent stabilization of labile Mn3+, even under electrophoretic conditions. The method was optimized regarding the concentration of diphosphate and modifier to obtain suitable signals for quantification. Additionally, the finally obtained method was applied on carbonate-based electrolytes samples. Dissolution experiments of the cathode material LiNi0.5Mn1.5O4 (lithium nickel manganese oxide [LNMO]) in aqueous diphosphate buffer at defined pH were performed to investigate the effect of a transition metal-ion-scavenger on the oxidation state of dissolved manganese. Quantification of both Mn species revealed the formation of mainly Mn3+, which can be attributed to a comproportionation reaction of dissolved and complexed Mn2+ with Mn4+ at the surface of the LNMO structure. It was also shown that the formation of Mn3+ increased with lower pH. In contrast, dissolution experiments of LNMO in carbonate-based electrolytes containing LIPF6 showed only dissolution of Mn2+. 相似文献
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K. Henschel B. Hellwig F. Amtage J. Vesper M. Jachan C. H. Lücking J. Timmer B. Schelter 《The European physical journal. Special topics》2008,165(1):25-34
The analysis of multi-dimensional biomedical systems requires analysis techniques, which are able to deal with multivariate
data consisting of both time series as well as point processes. Univariate and bivariate analysis techniques in the frequency
domain for time series and point processes are established and investigated, although the number of investigations is strongly
biased towards time series. Actual multivariate techniques for time series or hybrids of time series and point processes are
scarcely addressed. Here, we present spectral analysis techniques which are able to analyse point processes as well as time
series. Thereby, univariate, bivariate as well as multivariate techniques are discussed. Applications to simulated as well
as real-world data reveal the abilities of the proposed techniques. 相似文献
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For the multivariate ℓ1-norm symmetric distributions, which are generalizations of the n-dimensional exponential distribution with independent marginals, a geometric representation formula is given, together with some of its basic properties. This formula can especially be applied to a new developed and statistically well motivated system of sets. From that the distribution of a t-statistic adapted for the two-parameter exponential distribution and its generalizations is determined. Asymptotic normality of this adapted t-statistic is shown under certain conditions. 相似文献
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Henschel A Gedrich K Kraehnert R Kaskel S 《Chemical communications (Cambridge, England)》2008,(35):4192-4194
A very high catalytic activity in the cyanosilylation reaction was observed for MIL-101, a chromium based metal-organic framework; moreover, MIL-101 is also a remarkably stable support for palladium in hydrogenation reactions, with significantly higher activity than e.g. palladium on activated carbon. 相似文献
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