manganese dioxide

The influence of rare earth elements nature on MnO2 electrode electrochemical modification process in solutions of their salts in aprotic organic solvents was investigated. It was proved that periodicity of properties inherent in the lanthanides takes place in the products of their interactions with MnO2 and it is connected with characteristics of their structure. It was shown that the choice of metal as a modifying agent may be decisive in choosing the conditions of synthesis of cathode materials.

Manganese oxide was obtained by cathodic electrochemical deposition from the electrolyte solutions adding sodium nitrate or sulfate. The structural characteristics and the elemental composition of the MnO2 samples were studied by energy dispersive microanalysis, IR spectroscopy, and transmission electron microscopy. The electrochemical characteristics of the electrodes were determined by cyclic voltammetry, galvanostatic charge-discharge and impedance spectroscopy in 0.5M Na2SO4 solution.

DOI: https://doi.org/10.18500/1608-4039-2017-17-1-19-28

The review of cathode materials for lithium-ion batteries is presented, the analysis of advantages and application prospects of cathode materials on the basis of lithiated transition metals oxides is carried out. A method of heterovalent modification by ions of highly negative elements, lanthanum and its analogues for improving the electrochemical indices and stability of lithium manganese spinel is proposed. The effectiveness of fullerene, lithium fluoride, fullerenes halogen derivatives as modifying additive for MnO₂ cathode materials has been noticed.