ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)


Литиевые электрохимические системы

ВЛИЯНИЕ МЕХАНОАКТИВАЦИИ НА СИНТЕЗ ФОСФАТА ЛИТИЯ-ВАНАДИЯ ДЛЯ ЛИТИЙ-ИОННЫХ АККУМУЛЯТОРОВ

Одним из направлений по развитию литий-ионных аккумуляторов является разработка материала положительного электрода, от характеристик которого в значительной степени зависят конечные электрохимические параметры источника тока. В работе рассматривается влияние механоактивации и условий синтеза на структуру фосфата лития-ванадия. Показано, что механоактивация позволяет сократить время, уменьшить энергозатраты и увеличить выход ванадий-фосфат лития. Получено оптимальное соотношение активной массы/твердополимерного электролита/углерода для синтеза фосфата лития-ванадия.

Аноды на основе NiO/C для литий-ионных источников тока

В настоящее время ведется активный поиск анодного материала для литий-ионных источников тока (ЛИИТ). Потенциально возможными материалами ЛИИТ являются оксиды переходных металлов (SnO2, NiO и другие). В работе методом термического разложения Ni(CH3COO)2·4H2O получен субмикронный порошок NiO, изготовлен композитный анод NiO/C и изучено его поведение при многократном циклировании в составе анодного полуэлемента ЛИИТ. Показана работоспособность полученного анодного материала и определены его основные энергетические характеристики.

C/SiC-based anodes for lithium-ion current source

Compositions of ultrafine Si and C particles are promising anode materials for lithium-ion power sources with improved energy characteristics. In the work, samples of lithium-ion power sources with an anode made of ultrafine SiC fibers, as well as mixtures of SiC fibers with graphite (C/SiC) and electrolytically deposited submicron silicon fibers (C/Si/SiC) were fabricated and studied for energy characteristics.

Effect of properties of carbon materials on specific energy and cycling of lithium-sulfur batteries

The effect of the structure and the specific surface area of carbon materials, contained in positive electrodes, on the peculiarities of cycling of lithium-sulfur cells (the depth of electrochemical reduction of sulfur and lithium polysulfides, the changes in capacity and Coulomb efficiency of cycling) was studied.

Application of operando X-ray diffraction to evaluate phase transformations of a LiCoVO₄ cathode

Characterization by in situ or operando methods is very important to deeper understand the chemical and electrochemical processes, as well as the degradation processes that occur during the operation of a lithium-ion battery.

Neodymium-doped lithium titanate as anode material for lithium-ion batteries

Doped lithium titanate is known to be able to reversibly cycle in the potential range from 3 to 0.01 V and this ability depends both on the nature of the dopant and the doping level. In this work Li4Ti5O12 samples doped with Nd in the amount of 0.5 to 2.0% were studied. It was shown that while being cycled in the extended potential range, the samples with the doping level from 0.5 to 1.0% demonstrated the highest capacity.

The effect of surface capacity of positive electrodes on cycle life of lithium-sulfur batteries

The effect of sulfur content in positive electrodes (the surface capacity of sulfur electrodes) on the characteristics (such as the depth of sulfur electrochemical reduction, changes in capacitance and Coulomb efficiency during cycle life) of lithium-sulfur cells with electrolytes based on sulfolane was studied. It was shown that the reason for the capacitance decrease of the lithium-sulfur cells at the early stage of its cycle life is the displacement of sulfur of the porous positive electrode from the rear regions into the front ones.

Study of the reversible electrochemical insertion of lithium into boron

The reversible insertion of lithium into electrodes based on amorphous boron has been studied. The reversible capacity upon the lithium insertion has been found to be about 750 mA⋅h/g. The most efficient in terms of specific capacity are the electrodes containing graphene as a conductive additive.

The chemical current sources with a magnesium anode: Electrode materials and their properties

The article is devoted to the study of the possibility of creating chemical current sources with a magnesium anode. The work presents the continuation of the analysis of conventional current sources with high specific characteristics. The article describes the types of cathode-active substances that have potential possibility in making chemical current sources with a magnesium anode or an anode based on magnesium intermetallic compounds.

Lithium-ionic batteries: the modern state, problems, and outlook

A modern state of developments of lithium-ion batteries, as well as their main problems and the directions of their advancing are reviewed.

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