Effect of high temperature thermal treatment on the electrochemical performance of natural flake graphite
Lähde, A., Välikangas, J., Meščeriakovas, A., Karhunen, T., Meščeriakovė, S.-M., Sippula, O., Leinonen, S., Lassi, U., & Jokiniemi, J. (2024). Effect of high temperature thermal treatment on the electrochemical performance of natural flake graphite. Journal of Materials Research, Early online. https://doi.org/10.1557/s43578-024-01282-z
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Journal of Materials ResearchAuthors
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2024Copyright
© 2024 the Authors
Natural graphite is currently considered as a critical raw material in EU. The demand for graphite is still increasing as it is commonly used in the anodes of the Li-ion batteries (LIBs). The total graphite content for energy storage applications such as LIBs should be more than 99.95%. Several purification processes for natural graphite exist but the requirement of high purity is challenging. Here we present the high temperature thermal treatment for natural graphite ores. Thermal treatment at 2400 °C for 15 min can produce battery-grade graphite with high purity and crystallinity needed for the optimum performance of the battery cells. In addition, the crystallinity and crystalline structure of graphite was improved during the treatment. The electrochemical studies of thermally treated graphite powders showed increased electrochemical performance compared to the untreated graphite samples. The improved performance was attributed to the increased purity and crystallinity of the thermally treated powders.
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https://converis.jyu.fi/converis/portal/detail/Publication/202835863
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Open access funding provided by University of Eastern Finland (including Kuopio University Hospital). Te authors acknowledge Business Finland for research funding 2021–2024, University of Oulu (BATCircle2.0, No. 44612/31/2020), Geological Survey of Finland (BATCircle2.0, No. 44386/31/2020), University of Eastern Finland (BATCircle2.0, No. 44836/31/2020).License
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