ИСТИНА

At the present time the improving of LiFePO4 cathode material for lithium rechargeable batteries is in the greatest interest. One of the ways of improving LiFePO4 consists of partial replacement of Fe on other 3d elements. In our work the main efforts have been made on the obtaining LiFe1-xMnxPO4 solid solution particles with different manganese content x in the form of thin plates of nano-thickness. The samples with x = 0, 0.25, 0.5, 0.75 and 1 were obtained and studied. The template technique was involved for solving the problem. Initially, the thin plates Fe1-xMnx(OH)2 were precipitated as the templates, then a solution of NH4H2PO4 was added. The thin plates of NH4Fe1-xMnxPO4∙H2O of micron size of thickness about 200 nm were crystallized. After annealing with lithium carbonate at 600°C in 12 h under argon flow the monophase samples were obtained. According to results of chemical analysis, the Fe/Mn ratio in LiFe1-xMnxPO4 corresponded to the Fe and Mn ratio in initial solution, the lithium content was near stoichiometry. The fundamental problems of template technique in LiFe1-xMnxPO4 producing are discussed.