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СИНТЕЗ И ИОННАЯ ПРОВОДИМОСТЬ ТВЕРДЫХ ЭЛЕКТРОЛИТОВ НА ОСНОВЕ ФОСФАТА ЛИТИЯ-ТИТАНА
Неорганические материалы. 2021. Т. 57. № 10. С. 1094–1101.
The processes occurring during the solid-state synthesis of germanium-doped lithium titanium
phosphate have been studied. The formation of LiTi2 – xGex(PO4)3 has been shown to proceed through the
titanium pyrophosphate formation followed by its transformation into materials with the NASICON structure.
The process is completed at 1073 K. To produce ceramics with an optimal conductivity, annealing at
1173 K is required. Based on the results obtained, a two-stage synthesis procedure was developed. The highest
ionic conductivity (3.9 × 10–5 Ohm–1 cm–1 at 433 K) and the lowest activation energy (46 ± 1 kJ/mol) were
observed for LiTi2 – xGex(PO4)3 materials with a titanium substitution degree of 20–25% (x = 0.4–0.5). It can
be attributed to an optimal size of lithium transport channels.
Voropaeva D., Trofimenko N. A., S. A. Novikova et al., Membranes and Membrane Technologies 2025 Vol. 7 No. 2 P. 112–124
Modern studies in the field of lithium metal batteries focus on the development of safe and stable electrolytes with high ionic conductivity and electrochemical stability. In this context, promising materials are gel polymer electrolytes based on perfluorosulfonic acid cation-exchange membranes modified with inorganic fillers and solvated with aprotic solvents. This study addresses Nafion® composite membranes ...
Added: February 17, 2026
Karavanova Y.A., Golubenko D.V., Yaroslavtsev A.B., МЕМБРАНЫ И МЕМБРАННЫЕ ТЕХНОЛОГИИ, Российская Федерация 2020 Vol. 2 No. 4 P. 251–255
Phosphonates with the composition Zr(PO3(CH2)nPh)2 with n = 0, 1, and 3 are synthesized. Hybrid membranes based on an MF-4SK membrane and the synthesized phosphonates are made. The influence of the dopant, its concentration, and synthesis method on the ion-conducting properties of the membranes is studied in comparison with hybrid membranes based on α-zirconium hydrogen phosphate. ...
Added: November 5, 2024
Voropaeva D., Safronova E., Novikova S. et al., Journal of Physical Chemistry C 2024 Vol. 128 No. 10 P. 4143–4151
Gel-polymer electrolytes based on perfluorinated cation-exchange membranes are promising electrolytes for lithium metal batteries due to the strength and chemical stability of the fluorinated matrix and high values of ionic conductivity and cation transference numbers, which contribute to the suppression of dendrite formation. The present work compares the main characteristics of polymer electrolytes based on ...
Added: June 20, 2024
Voropaeva D., Novikova S., Stenina I. et al., Polymers 2023 Vol. 15 No. 22 Article 4340
The use of cation-exchange membranes as electrolytes for lithium metal batteries can prevent the formation of lithium dendrites during extended cycling and guarantee safe battery operation. In our study, the Nafion-212 membrane in lithium form solvated by a mixture of ethylene carbonate and propylene carbonate (EC-PC) was used as an electrolyte in a lithium metal ...
Added: January 25, 2024
Stenina I., Novikova S., Voropaeva D. et al., Batteries 2023 Vol. 9 No. 8 Article 407
All-solid-state lithium batteries are a promising alternative to commercially available
lithium-ion batteries due to their ability to achieve high energy density, safety, and compactness. Electrolytes
are key components of all-solid-state batteries, as they are crucial in determining the batteries’
efficiency. Herein, the structure of LiM2(PO4)3 (M = Ti, Ge, Zr) and lithium-ion migration mechanisms
are introduced as well as ...
Added: January 23, 2024
Trofimov Y. A., Minakov A. S., Krylov N. A. et al., Doklady Biochemistry and Biophysics 2023 Vol. 508 No. 1 P. 1–5
In many types of ion channels, certain internal surface areas of their transmembrane pores are lined with non-polar residues forming a kind of "belts" of hydrophobicity. When a channel resides in a closed/inactivated state, this prevents spontaneous diffusion of water and ions through the membrane. At the same time, when a channel is activated and, ...
Added: February 21, 2023
Safronova E., Воропаева Д. Ю., Novikova S. et al., Мембраны и мембранные технологии 2022 Т. 12 № 1 С. 47–56
В статье описано влияние природы растворителя на примере полярных протонных (вода) и апротонных (N,N-диметилформамид (ДМФА) и N,N-диметилацетамид (ДМА)) жидкостей на свойства
мембран Nafion, полученных из них методом отливки. Влагосодержание и протонная проводимость
мембран Nafion, полученных из водной дисперсии, существенно выше, чем из дисперсий в ДМФА
и ДМА, однако их механические свойства и стабильность обычно оказываются невысокими. Непродолжительная ультразвуковая ...
Added: November 25, 2022
Yurova P., Малахова В. Р., Gerasimova E. V. et al., Polymers 2021 Vol. 13 No. 15 P. 2513
Low chemical durability of proton exchange membranes is one the main factors limiting their lifetime in fuel cells. Ceria nanoparticles are the most common free radical scavengers. In this work, hybrid membranes based on Nafion-117 membrane and sulfonic or phosphoric acid functionalized ceria synthesized from various precursors were prepared by the in situ method for ...
Added: February 3, 2022
Golubenko D. V., Van der Bruggen B., Yaroslavtsev A. B., Journal of Power Sources 2021 Vol. 511 Article 230460
Radiation-induced grafted ion exchange membranes based on functionalized polystyrene were tested for the first time in reverse electrodialysis (RED). Сation and anion exchange membranes based on sulfonated and quaternized/chloromethylated poly(styrene-co-divinylbenzene) grafted on UV-oxidized polymethylpentene films with different conductivity and selectivity relationships were compared with each other and with different commercial ion-exchange membranes (IEMs), FujiFim® Type ...
Added: December 2, 2021
Yurova P., Стенина И. А., Yaroslavtsev A. B., Russian Journal of Electrochemistry 2020 Vol. 56 P. 528–532
Composite materials based on heterogeneous membranes MK-40 modified by a thin layer of homogeneous cation-exchange perfluorinated sulfo membrane MF-4SK doped with 2 and 5% ceria are prepared. The transport characteristics of these membranes in different ionic forms are studied. It is shown that the conductivity of ionic forms of membranes increases in the sequence Li+ ...
Added: November 29, 2020
Golubenko D. V., Воропаева Д., Yaroslavtsev A. B., Materials Letters 2020 Vol. 277 P. 128247
Cation-exchange membranes based on polystyrene block-copolymer with phenylsulfonylimide ionogenic groups in the Na+-form show conductivities up to 0.2 mS cm−1 in organic amides such as N-methylpyrrolidone and N,N-dimemylacetamide. These values are 2-2.5 orders of magnitude higher compared to those of conventional sulfonated cation-exchange membranes. A strong dependence of solvation degree and ionic conductivity on dielectric ...
Added: August 30, 2020
Yaroslavtsev A. B., Стенина И., Golubenko D. V., Pure and Applied Chemistry 2020 Vol. 92 No. 7 P. 1147–1157
Ion exchange membranes are widely used in chemical power sources, including fuel cells, redox batteries, reverse electrodialysis devices and lithium-ion batteries. The general requirements for them are high ionic conductivity and selectivity of transport processes. Heterogeneous membranes are much cheaper but less selective due to the secondary porosity with large pore size. The composition of ...
Added: August 30, 2020
Golubenko D. V., Yaroslavtsev A. B., Voropaeva D. et al., Journal of Membrane Science 2020 Vol. 601 P. 117918
Cation-exchange membranes containing sulfo R–SO3M and sulfonylimide functional groups [R–SO2NSO2–X]M, where X¼CCl3, CF3, Ph, p-NO2Ph, p-CF3Ph and Mþ¼Li/Na/H, have been synthesized by the Hinsberg reaction from the polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene block copolymer. The obtained membranes have been characterized using ATR IR spectroscopy, CHNS elemental analysis, TGA, DSC, SEM and X-ray diffraction analysis, as well as mechanical properties ...
Added: February 27, 2020
Yurova P., Aladysheva U. S., Stenina I. et al., Russian Journal of Electrochemistry 2019 Vol. 55 P. 1292–1298
Composite materials based on homogeneous perfluorinated cation exchange membranes MF-4SK and sulfonated zirconium oxide were obtained by in situ and casting methods and their transport properties and gas permeability were studied. With the introduction of sulfonated zirconia, the conductivity of in situ and casting membranes increases at room temperature by more than 1.5 and 4 ...
Added: November 13, 2019
Yurova P., Karavanova Y., Stenina I. et al., Nanotechnologies in Russia 2016 Vol. 11 No. 11-12 P. 761–765
A number of MK-40 cation-exchange membrane samples modified with ceria have been obtained. The membranes have been studied using a set physicochemical methods, including impedance spectroscopy, scanning electron microscopy, microanalysis, transmission electron microscopy, and XRD phase analysis. Ithas been shown that the embedding of cerium oxide reduces the humidity content and ionic conduction of membranes. ...
Added: November 13, 2019
Yurova P., Караванова Ю. А., Yaroslavtsev A. B., Журнал неорганической химии 2015 Т. 60 № 11 С. 1551–1553
The properties of hybrid materials based on the MK-40 heterogeneous membrane, the MF-4SK homogeneous membrane, and zirconium oxide with a functionalized surface are studied. The ionic conductivity and diffusion parameters of these materials were studied. The presence of the asymmetry effect of diffusion permeability and mutual diffusion of HCl and NaCl solutions through the studied ...
Added: November 13, 2019