THE USING OF THERMAL ANALYSIS FOR STUDY OF PRODUCTS OF HETEROPHASE PYROLYTIC DECOMPOSITION ON MODIFIED NATURAL GRAPHITE

The intensive development of electric vehicles and portable electronics significantly activated the research in the field of electric batteries, in particular, lithium-ion batteries (LIB) and their components such as electrodes. The application of differential thermogravimetric analysis and differential scanning calorimetry under oxidative atmosphere for quantitate determination of pyrolytic carbon in the products of heterophase decomposition of toluene-argon mixture on the spheroidized graphite, which is used as the active materials of the LIA anodes, is regarded. It was shown, that the using of double mass loss at the maximum combustion rate of pyrolytic graphite under the heating rate of 10 °C/min makes it possible to determine the content of pyrocarbon in the range from 8 to 23 wt.% with the precision of not less than 10%. The local extremums on the curves of either differential thermogravimetric analysis or differential scanning analysis can be chosen as the maximum combustion rate of pyrolytic carbon. It was established that further increasing of precision can be achieved by decreasing of heating rate which causes, however, increasing of the measurement duration. The using of heating rates higher than 10 °C/min can result in significant overlapping of thermooxidative destruction processes of pyrolytic carbon and spheroidized graphite, that can lead to increasing in an error and to appearance of difficulties under determination of maximal combustion rate of pyrolytic carbon. It was noted that such an approach can cause significant error if the properties of pyrolytic carbon coating are similar to those of spheroidized graphite. For citation: Khaskov M.A., Naumova V.A., Karaeva A.R., Mordkovich V.Z. The using of thermal analysis for study of products of heterophase pyrolytic decomposition on modified natural graphite. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 10. P. 6-15. DOI: 10.6060/ivkkt.20246710. 14y.