Lithium battery negative electrode coated pitch based on ethylene tar fraction precise cutting and preparation method thereof

Abstract

This invention discloses a lithium-ion battery anode coating asphalt based on precise ethylene tar fraction cutting and its preparation method, relating to the field of new energy materials technology. Using ethylene tar as raw material, molecular distillation below 0.1 kPa is performed to precisely cut ultra-narrow fractions at 185-205℃ / 0.1 kPa and 225-245℃ / 0.1 kPa. These fractions are mixed at a ratio of 1:0.3-0.8 and then combined with MOF derivatives or POSS-type template agents to form a loading system. This system is then fed with the remaining fraction at a mass ratio of 30-50:50-70 into a packed bed microreactor containing Ni-Mo / Co-Mo bimetallic active centers, where it undergoes confined cross-linking at 280-340℃ and 0.3-0.8 MPa. The template agent is recovered by ultrasonic extraction, and the precursor is rapidly cooled and kneaded to lock in a liquid crystal-like structure, yielding a coating asphalt with a tricyclic and tetracyclic aromatic hydrocarbon content ≥85% and no significant QI impurities, suitable for lithium-ion battery anode coating.

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