en.Wedoany.com Reported - A research team at Pennsylvania State University has transformed waste polyethylene terephthalate (PET) into highly ordered synthetic graphite, whose crystal structure surpasses that of commercial natural graphite samples. Published in the journal Diamond and Related Materials, the study indicates that common waste plastics could become a valuable source of battery-grade carbon.
Graphite is a key component of anode materials in lithium-ion batteries and is classified as a critical mineral by the U.S. Department of Energy. With growing demand from electric vehicles, consumer electronics, and grid-scale energy storage systems, the need for battery-grade graphite continues to rise. Meanwhile, PET, one of the most widely used plastics globally, often ends up discarded, downcycled, or sent to landfills despite many consumers placing it in recycling bins.
The research team combined shredded PET plastic with a small amount of graphene oxide and heated the material through a carefully controlled thermal process, allowing the carbon atoms in the plastic to reorganize into a highly ordered graphite structure. The researchers found that adding just 2.5% by weight of graphene oxide produced the highest-quality graphite, with crystallite sizes exceeding those of natural graphite, indicating superior structural order.
According to the researchers, oxygen-containing functional groups on the edges of graphene oxide sheets help initiate and promote lateral graphite crystal growth. During graphitization, the exposed graphene surfaces act as templates, guiding carbon atoms to stack in a highly ordered arrangement. This method differs from many traditional graphitization techniques that rely on metal catalysts such as iron, nickel, or cobalt, which leave impurities and require additional chemical purification steps. The graphene-based additive facilitates graphitization without introducing metal contaminants.
Shakshi Sekar, the study's first author and a doctoral student in the John and Willie Leone Family Department of Energy and Mineral Engineering at Pennsylvania State University, stated that avoiding metal catalysts allows for the production of purer graphite while reducing chemical usage and waste generation. Eliminating the catalyst removal step is expected to simplify future manufacturing processes and reduce the environmental footprint associated with producing battery materials.
The researchers noted that additional work is needed to evaluate large-scale production and battery performance, but the study demonstrates a pathway for converting common waste streams into high-value energy storage materials. Sekar indicated that this finding also points to a broader shift in how plastic waste is viewed in the future, positioning plastics as a resource to support clean energy technologies.
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