| Abstract [eng] |
Sodium ion batteries are considered to be one of the best alternatives to lithium ion batteries due to the availability and price of sodium. With the growing interest in sodium batteries, various materials are being tested as potential cathodic and anodic materials in these batteries. A group of materials with a BP type structure modified with different transition metals is considered to be a potential electrode material due to its ease of synthesis and ionic conductivity. Iron, copper, and manganese substituted hexacyanoferrates (FeHCF, CuHCF, and MnHCF) used as cathode materials in non-aqueous sodium ion batteries showed excellent electrochemical properties but the same cathodic materials are not analyzed that much in aqueous NIB. In this research PBA with different transition metals were sinthesised using coprecipitation method. Phase analysis of the synthesized samples allowed to determine the purity of the obtained materials and to evaluate the lattice parameters. Studies of the morphology of the samples showed the formation of irregular particles of varying sizes in the case of FeHCF, and the formation of orderly particles in the case of CuHCF and MnHCF. Cyclic voltammetry measurements using electrode made from sythesised PBA electrodes showed the position of redox couples of the materials. Cycling of the PBA electrodes showed that the FeHCF and CuHCF electrodes were sufficiently stable in the selected aqueous electrolyte while the MnHCF electrode tended to degrade. |
