Experimental and ab initio investigations on textured Li–Mn–O spinel thin film cathodes

Fischer, Julian; Mušić, Denis; Bergfeldt, Thomas; Ziebert, Carlos; Ulrich, S.; Seifert, H. J.

doi:10.1016/j.tsf.2014.08.018

Cited by 4 publications

(2 citation statements)

References 54 publications

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“…Decoration of LiMn 2 O 4 Films and Particles with Alkylphosphonate SAMs : Thin film LMO cathodes were prepared via RF magnetron sputtering using a modification of a previously reported methods . A stoichiometric lithium manganese oxide plate (LTS Research Laboratories, Inc.) was used as the target.…”

Section: Methodsmentioning

confidence: 99%

Controlling Interfacial Properties of Lithium‐Ion Battery Cathodes with Alkylphosphonate Self‐Assembled Monolayers

Nicolau

Petronico

Letchworth‐Weaver

et al. 2018

Adv Materials Inter

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In this work, the preparation and characterization of modified LiMn2O4 (LMO) cathodes utilizing chemisorbed alkylphosphonic acids to chemically modify their surfaces are reported. Electrochemical methods to study ionic and molecular mobility through the alkylphosphonate self‐assembled monolayers (SAMs) for different alkyl chain compositions, in order to better understand their impact on the lithium‐ion electrochemistry, are utilized. Electrochemical trends for different chains correlate to trends observed in contact angle measurements and solvation energies obtained from computational methods, indicating that attributes of the microscopic wettability of these interfaces with the battery electrolyte have an important impact on ionic mobility. The effects of surface modification on Mn dissolution are also reported. The alkylphosphonate layer provides an important mode of chemical stabilization to the LMO, suppressing Mn dissolution by 90% during extended immersion in electrolytes. A more modest reduction in dissolution is found upon galvanostatic cycling, in comparison to pristine LMO cathodes. Taken together, the data suggest that alkylphosphonates provide a versatile means for the surface modification of lithium‐ion battery cathode materials allowing the design of specific interfaces through modification of organic chain functionalities.

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Section: Methodsmentioning

confidence: 99%

Controlling Interfacial Properties of Lithium‐Ion Battery Cathodes with Alkylphosphonate Self‐Assembled Monolayers

Nicolau

Petronico

Letchworth‐Weaver

et al. 2018

Adv Materials Inter

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“…The deposited films are investigated by ICP-OES in combination with Carrier-Gas Heat Extraction and show a stoichiometry of Li 1.064 Mn 1.792 O 4.144 . 48 The diameter of those LMO films is 5 mm. Their thickness is 1 μm on each side.…”

Section: Methodsmentioning

confidence: 99%

Thin-Film Calorimetry: Analytical Tool for In-Situ Characterization of Lithium Ion Batteries

Wulfmeier

Albrecht

Fischer

et al. 2015

J. Electrochem. Soc.

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Thin-Film Calorimetry (TFC) as presented in this work is a novel analytical tool to determine phase transformation temperatures and enthalpies of thin films and thin-film sequences. The key component is a high-temperature stable piezoelectric langasite (La 3 Ga 5 SiO 14 ) resonator serving as a highly sensitive planar temperature sensor. Deviations in its frequency are related to temperature fluctuations caused by phase transformations and used to calculate the related enthalpies. Temperature ramps from room temperature up to 1000 • C are applied to perform calorimetric thin-film investigations. Thereby, the atmosphere can be controlled. To the best of our knowledge, the presented TFC is the only existing technique combining the aspects "thin films" and "high-temperature calorimetry." The first part of this article describes the newly developed TFC system. The second part presents TFC investigations on lithium manganese oxide (LMO) thin films. Measurements are carried out in ambient air and in 0.5 %H 2 /Ar. In air three phase transformations appear (at 330, 410 and 600 • C) while in 0.5 %H 2 /Ar four phase transformations are observed (at 389, 471, 730 and 758 • C). Their progression and related enthalpies are discussed. To determine the associated crystallographic phases, X-ray diffraction and Raman spectroscopy are performed.

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Materials and structure engineering by magnetron sputtering for advanced lithium batteries

Qian

et al. 2021

Energy Storage Materials

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Experimental and ab initio investigations on textured Li–Mn–O spinel thin film cathodes

Cited by 4 publications

References 54 publications

Controlling Interfacial Properties of Lithium‐Ion Battery Cathodes with Alkylphosphonate Self‐Assembled Monolayers

Controlling Interfacial Properties of Lithium‐Ion Battery Cathodes with Alkylphosphonate Self‐Assembled Monolayers

Thin-Film Calorimetry: Analytical Tool for In-Situ Characterization of Lithium Ion Batteries

Materials and structure engineering by magnetron sputtering for advanced lithium batteries

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