Abstrakt

In this work, the properties of binary SiOC/graphite and SiOC/tin, as well as ternary SiOC/graphite/tin obtained from various preceramic precursors are described. During the first step, the materials were synthesized using various techniques such as sol-gel and hydrosilylation. To prevent sedimentation and agglomeration of graphite particles during the gelation stage without using surfactants and thickeners, a new gelation technique with utilizing simulations homogenisation and high-power ultrasounds was developed. This method enables a uniform distribution of graphite particles in a polymer blend. In addition, heat generated during this process shortens the gelation time from a few days to a few hours. In the second step, structural and electrochemical characterisation of the obtained materials was conducted. The carbon, ceramic and tin phases were carefully studied in terms of the quantity, structure, morphology, distribution, and in terms of possible reactions that could occur during the synthesis of the materials. In the case of electrochemical measurements, primary focus was on relationships between the content of the additives, the preceramic precursor type, and the resulting microstructure of the composites which influences their final electrochemical properties.

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