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

литий-ионный аккумулятор

Probabilistic models of the capacity of the electrode material in a wide range of current loads

An approach for constructing mathematical models of the current dependence of the capacity of electrode materials is proposed. The approach involves analyzing the probabilities of favorable and unfavorable events occurring on the elements of electrical equivalent circuits that can be used to model the electrode. Several probabilistic models that correspond to different combinations of a capacitor, a Warburg element and a constant phase element in an electrical circuit are proposed.

The LiFePO4-electrode process features in Li-ion batteries

Features of lithiated iron phosphate behavior (PH/P1, Phostech Lithium Inc, Canada) used as positive electrode of lithium-ion battery with LiPF6-based electrolyte were investigated. It was shown that lihiated iron phosphate potential does not depend of lithium contents in active material. It was shown that cycle life of the positive electrode strongly depends on charge/discharge current. Fast degradation of the positive electrode takes place at low current rates (0.25 and 0.5C). At the same time degradation is considerably lower at 1 and 2.5C rates.

Peculiarities of sulfur electroreduction on the graphite electrode of lithium-ionic batteries

The additive into electrolyte SO2 allowing to realize the intercalation of lithium ions into spectral-pure graphite is shown in the work given. The monolayer of SO2 restoration products possessing the properties of solid inter phase electrolyte is formed on the material given. The formation of the surface layer requires 160±15 mA·h/g.

Lithiated iron phosphate for commercial lithium-ion batteries

Behavior of PH/P1 lithiated iron phosphate (Phostech Lithium Inc, Canada) used as positive electrode material for Li-ion battery with LiPF6-based electrolyte was investigated. Specific capacity of the material reached 130 mA·h/g at a rate of 0.5С and 20°C, 105 mA·h/g (1С) and 95 mA·h/g (2.1C). Cell capacity increased by 20% during first 50 cycles and minor capacity fade at a rate of 0.04% per cycle is observed after 300 cycle when cycled at 2C rate versus carbon negative electrode (CMS, PRC).

Modernization of the flash point tester PE-TVZ for determining fire safety of electrolyte systems of energy-intensive batteries

The flash point tester PE-TVZ was modernized. The sample volume was reduced from 70 to 5 ml. Mixing of the condensed and gas-vapor phases was done simultaneously. The mercury thermometer was replaced by an electronic one. The correctness of the flash point measurement by the modernized device was tested on the samples with the flash point in the range of 25–170°C.

Renaissance of lithium electrode

The publications of the recent 15 years devoted to using lithium metal in rechargeable batteries are analyzed and their short overview is presented.

Ренессанс литиевого электрода

Краткий обзор. Рассмотрены работы последних 15 лет, посвящённых возможности использования металлического лития в аккумуляторах

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.

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.