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Your search keyword '"Fedorovskaya, Ekaterina O."' showing total 24 results
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24 results on '"Fedorovskaya, Ekaterina O."'

7. Joint effect of ethylene and toluene on carbon nanotube growth

Author

Khabushev, Eldar M., primary, Krasnikov, Dmitry V., additional, Goldt, Anastasia E., additional, Fedorovskaya, Ekaterina O., additional, Tsapenko, Alexey P., additional, Zhang, Qiang, additional, Kauppinen, Esko I., additional, Kallio, Tanja, additional, and Nasibulin, Albert G., additional

Published
2022
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8. Comparison of Methodologies to Estimate State-of-Health of Commercial Li-Ion Cells from Electrochemical Frequency Response Data

Author

Chan, Hoon Seng, primary, Dickinson, Edmund, additional, Heins, Tom, additional, Park, Juyeon, additional, Gaberscek, Miran, additional, Lee, Yan Ying, additional, Heinrich, Marco, additional, ruiz ruiz, vanesa, additional, Napolitano, Emilio, additional, Kauranen, Pertti, additional, Fedorovskaya, Ekaterina O., additional, Moškon, Jože, additional, Kallio, Tanja, additional, Mousavihashemi, Seyedabolfazl, additional, Krewer, Ulrike, additional, Hinds, Gareth, additional, and Seitz, Steffen, additional

Published
2022
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10. Comparative Study of the Structural Features and Electrochemical Properties of Nitrogen-Containing Multi-Walled Carbon Nanotubes after Ion-Beam Irradiation and Hydrochloric Acid Treatment

Author

Korusenko, Petr M., primary, Nesov, Sergey N., additional, Iurchenkova, Anna A., additional, Fedorovskaya, Ekaterina O., additional, Bolotov, Valery V., additional, Povoroznyuk, Sergey N., additional, Smirnov, Dmitry A., additional, and Vinogradov, Alexander S., additional

Published
2021
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14. Data on the structure, chemical state of carbon and discharge characteristics of multi-walled carbon nanotubes and composites based on them modified by pulsed ion beam

Author

Korusenko, Petr M., primary, Nesov, Sergey N., additional, Povoroznyuk, Sergey N., additional, Bolotov, Valery V., additional, Sten'kin, Yuri, additional, Pushkarev, Alexander I., additional, Fedorovskaya, Ekaterina O., additional, Smirnov, Dmitry A., additional, and Ivlev, Konstantin E., additional

Published
2019
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15. New insights in Al‐doping effects on the LiNiO2 positive electrode material by a sol‐gel method.

Author

Kong, Xiangze, Li, Donglin, Fedorovskaya, Ekaterina O., Kallio, Tanja, and Ren, Xuqiang

Subjects
SOL-gel materials, SOL-gel processes, REVERSIBLE phase transitions, NANOCRYSTALS, ELECTRODES
Abstract

Summary: The LiNiO2 (LNO) positive electrode material is one of the most promising high‐voltage alternatives for the layered oxide materials such as LiCoO2 (LCO). However, the poor cyclability still limits widespread commercialization of LNO, whereas crack formation is one of the main issues leading to its premature aging. In this study, a series of Al‐doped LNO (LiNi1−xAlxO2, x = 0, 0.02, 0.04, 0.06) positive electrode materials are synthetized via a simple sol‐gel method. Overall, this study aims at providing new insights of the sol‐gel method and Al‐doped strategy for LNO positive electrode materials. The synthesis is found to readily yield in small nanosized crystals, which alleviate the cracking issue. Besides, the optimized Al‐doping amount (2 at%) in LNO decreases cation mixing and primary particle size resulting in improved layered structure stability attributed to more reversible H2‐H3 phase transitions. As a result, the assembled lithium ion batteries equipped with LiNi0.98Al0.02O2 can smoothly run for 400 cycles with a relatively high capacity retention of 81% at 100 mA g−1 charging‐discharging and a wide operating voltage window of 2.5‐4.5 V. [ABSTRACT FROM AUTHOR]

Published
2021
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17. One-step chemical vapor deposition synthesis and supercapacitor performance of nitrogen-doped porous carbon–carbon nanotube hybrids

Author

Lobiak, Egor V, primary, Bulusheva, Lyubov G, additional, Fedorovskaya, Ekaterina O, additional, Shubin, Yury V, additional, Plyusnin, Pavel E, additional, Lonchambon, Pierre, additional, Senkovskiy, Boris V, additional, Ismagilov, Zinfer R, additional, Flahaut, Emmanuel, additional, and Okotrub, Alexander V, additional

Published
2017
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22. Electrochemical Properties of the Ultrasonically Activated Thermally Expanded Graphite–Polyaniline Hybrid Material.

Author

Fedorovskaya, Ekaterina O., Bulusheva, Lyubov G., Smirnov, Dmitry A., and Okotrub, Alexander V.

Subjects
*ELECTROCHEMICAL sensors, *ULTRASONICS, *THERMAL analysis, *GRAPHITE, *POLYANILINES, *PRECIPITATION (Chemistry)
Abstract

Thermally expanded graphite (TEG) is used as a template for precipitation of polyaniline from an aqueous solution of aniline hydrochloride and sodium persulfate used as an oxidant. In the first case, the TEG sample is used without treatment, in the second case the TEG sample is activated by ultrasonication before the polyaniline precipitation. Raman spectroscopy shows the formation of polymer layers on the surface of graphene layers. Near‐edge X‐ray absorption fine structure and X‐ray photoelectron spectroscopy reveal the influence of the TEG ultrasonication on the chemical state of polyaniline in the hybrid. This material shows a large specific capacitance in a 1 M H2SO4 electrolyte due to the Faradaic processes in the polyaniline and high stability during the cycling. [ABSTRACT FROM AUTHOR]

Published
2018
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23. Polyaniline-intercalated MIL-101: selective CO2 sorption and supercapacitor properties.

Author

Aliev, Sokhrab B., Samsonenko, Denis G., Maksimovskiy, Evgeny A., Fedorovskaya, Ekaterina O., Sapchenko, Sergey A., and Fedin, Vladimir P.

Subjects
DEPOLYMERIZATION, AROMATIC amines, SPECTRUM analysis, CYCLIC voltammetry, CARBON dioxide
Abstract

A novel nanostructured hybrid material PANI@MIL-101(Cr) (PANI = polyaniline, MIL-101(Cr) – trichromium oxo-1,4-benzenedicarboxylate) was obtained by the intra-pore oxidative polymerization of guest aniline molecules within MIL-101. The compound was fully characterized using PXRD, TGA, FT-IR spectroscopy, XPS and SEM techniques. An introduction of PANI has dramatically increased the material's selectivity towards carbon dioxide over nitrogen with a CO2 uptake value of 2.26 mmol g−1 at 273 K (1.2 bar). Furthermore, cyclic voltammetry measurements revealed that PANI@MIL-101(Cr) is a supercapacitor with a relatively high specific capacitance value of 135 F g−1. [ABSTRACT FROM AUTHOR]

Published
2016
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24. Long-term cycling behavior of Mg-doped LiCoO2materials investigated with the help of laboratory scale X-ray absorption near-edge spectroscopy

Author

Lahtinen, Katja, Labmayr, Maximillain, Mäkelä, Ville, Jiang, Hua, Lahtinen, Jouko, Yao, Lide, Fedorovskaya, Ekaterina O., Räsänen, Samuli, Huotari, Simo, and Kallio, Tanja

Abstract

The use of Li-ion batteries is increasing rapidly. Understanding the processes behind active material aging helps to enhance the materials, and therefore, development of new in situmethods for structural studies is important. In addition, understanding the effect of different synthesis methods on the active material properties is necessary to optimize the material cycle life. In this work, the performance of LiCoO2doped with Mg during the lithiation step is compared to LiCoO2prepared using an Mg-doped Co3O4precursor. In situlaboratory-scale X-ray absorption near-edge spectroscopy is used to analyze the Co valence changes in LiCoO2to understand the electrochemical behavior of the investigated materials. The maximum reachable Co valence state is found to decrease upon aging, a small decrease indicating a good cycle-life, and this is attributed to the enhanced stacking order, better Mg distribution in the lattice, and fine primary particle size in the material. In the synthesis conditions used in this study, Mg doping during the lithiation step is shown to perform better compared to the precursor doping. Overlithiation is shown to reduce the electrochemical performance of nondoped and precursor-doped LiCoO2materials but not to affect the cyclability of lithiation-doped LiCoO2.

Published
2022
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