Abstract: Low-sulfur petroleum coke serves as the core raw material for producing artificial graphite anode materials. With the growth in demand for lithium-ion batteries, the value of low-sulfur petroleum coke for lithium-ion battery anodes has become increasingly evident.Using vacuum residue and deoiled asphalt from a certain petrochemical enterprise as raw materials, four types of petroleum coke were produced by adjusting the raw material ratios.The effects of raw material composition on petroleum coke yield, microstructure, graphitization performance, and the electrical properties of theanode materials were investigated. The results showed that as the content of aromatics and resins in the raw materials increased, the yields of coker gas oil and petroleum coke also increased, while the yields of gasoline and diesel slightly decreased. The composition of the raw materials had a significant impact on the microstructure of the petroleum coke products. When the resin content in the raw materials increased from 23.68% to 48.61%, the content of mosaic structures in the petroleum coke increased from 36.2% to 67.2%, and a small amount of isotropic structures appeared, which was unfavorable for the graphitization of the petroleum coke. Electrical performance tests were conducted on the anode materials obtained after graphitizing the four types of petroleum coke. It was found that material B, produced from petroleum coke B, exhibited the best overall performance, with a capacity of 341.35 (mA.h)/g, a first-cycle efficiency of 94.42%, and a capacity retention rate of 95.2% after 800 cycles at a 1 C discharge rate at 45 ℃. Petroleum coke B can be used to produce lithium-ion battery anode materials with good cycling performance and high capacity.

Key words: delayed coking, lithium-ion battery negative electrode material, petroleum coke, graphitization, anisotropic, wide area structure, streamlined fiber structure