ИСТИНА

Cathode materials based on transition metals-lithium phosphates are widely used in rechargeable power supplies and make trend to the production of sustainable energy storage systems. Such materials as LiFePO4, LiFe1-xMnxPO4 offer significant advantages as extended cycle life, lower production costs, and greater environmental friendliness compared to cobalt-containing cathodes. Developing or optimizing industrial-scale synthesis methods for lithium metal phosphates is necessary. Solvothermal synthesis is widely regarded as one of the most promising approaches for producing phosphate-based materials. Its key advantage lies in the broad range of adjustable parameters – such as temperature, pressure, and solvent composition – which enable precise control over crystal structure, particle size, and morphology. This flexibility has led to the development of numerous synthesis techniques tailored to specific material properties. However, despite its versatility, the economic feasibility and resource efficiency of solvothermal methods remain unresolved challenges, limiting their large-scale industrial adoption. Conventional hydro- or solvothermal synthesis of phosphate based cathode materials materials typically involves the use of water-soluble salts (FeSO4·8H2O, MnSO4·H2O) as precursors. However, their variable water content, aging and impurity formation may cause some problems for a large scale production. Abudant in nature and industry transition metal oxides (e.g., Fe2O3, MnO2) present a promising alternative to simplify and reduce the costs of synthesis. Our scientific report adress the use of d-cation oxides as metal-containing reagents for solvothermal synthesis of LiFePO4 and LiFe0.5Mn0.5PO4 by several approaches. Various phase transformations, morphology of particles and electrochemical properties depending on the synthesis conditoins and routes have been studied, emphasizing the issues of crystal structure imperfections and ways to evaluate them. The obtained results indicate the promise of approaches associated with the use of poorly soluble iron and manganese compounds in the solvothermal synthesis of cathode materials and can be used to scale up their production technology. The work was carried out with the financial support of the Russian Science Foundation, grant 24-13-00107. Presenting author: