Electrodeposits of tin-nickel alloys as anodes of lithium ion batteries have been investigated by potentiodynamic and galvanostatic cycling methods. It has been shown that deposits of tin-nickel alloys obtained from an alkaline tartrate-trilonate electrolyte are characterized, in the first cycles, by a high specific capacity of up to 700 mAh/g, which decreases to 500 mAh/g during cycling. The tin-nickel alloys obtained can ensure high charge-discharge current densities without mechanical destruction.

The paper presents the results of investigation of electrochemical characteristics of lithium-manganese spinel in electrolytes lithium bis(oxalate)borate LiB(C2O4)2 (LiBOB)–tetraethylenglycol dimethylether (tetraglyme, TG). Dependence of its specific capacity and stability within a wide range of temperature on the LiBOB concentration has been investigated. The results obtained give evidence that lithium-manganese spinel in electrolytes based on the LiBOB–tetraglyme mixtures is characterized by a high specific capacity and ability of stable cycling in a wide temperature range. Conductivity of solutions is determined by the salt concentration, and its temperature dependence is linear in coordinates of the Fogel– Tamman–Fulcher equation within the temperature range 10–100oC. Investigations have been performed using the lithium anode in cells of the 2016-type disk construction.

Discharge-ionization of hydrogen on carbon nanotube (CNT) electrodes in H3PO4 aqueous solution has been investigated and the effect of catalysts (Pt and polynuclear complexes 2Co-Ni with aminoethanol ligands) has been studied. It was found that the most probable mechanism contains the slow step of hydrogen atoms recombination on highly energetically nonuniform surface of CNT when the polarization is low. Increasing the polarization for more than -300 to -350 mV vs silver chloride reference electrode results in the operation of the CNT as a porous gas electrode with linear current-potential dependence. The influence of catalysts consists in the, first, decrease of the ohmic resistance of this electrode and, second, increase of the coulomb efficiency of charge (reduction of H+ ions) to discharge (oxidation of stored H-2) from 70 to 80-90%. As follows from the results, the complexes 2Co-Ni can be used instead of Pt in the CNT-based hydrogen storage materials. Copyright (c) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Structural and electrochemical features of LixMn2O4 spinel synthesized by the microwave method are described. The thermogravimetric analysis has shown that during microwave synthesis almost 84% of initial reactants undergo chemical transformation associated with the mass loss. Composition of initial components does not influence the heating rate, and the temperature reaches the value 400о C within 15 minutes. X-ray analysis has demonstrated that LixMn2O4 samples contain impurities of MnO2 and Mn2O3, the amount of which decreases with increasing concentration of lithium. Electrochemical characteristics of different LixMn2O4 samples, such as charge-discharge capacity, capacity dependence on the discharge rate and on the cycle number, are discussed.