Preparation method of isotropic coke, product obtained by preparation method and graphite

Isotropic coke was prepared by using an oil-in-water emulsion confined coking strategy, which solved the problems of slow lithium ion diffusion and non-uniform structure in traditional coke materials, and achieved graphitization effect with high capacity, high rate and long cycle life.

CN122445376AActive Publication Date: 2026-07-24HAIKE GRP RES INST OF INNOVATION & TECH
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Patent Information

Application Number
CN202610921630.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-25
Publication Date
2026-07-24
Estimated Expiration
2046-06-25

AI Technical Summary

Technical Problem

Existing technologies struggle to prepare coke materials that maintain high graphitization while promoting rapid lithium-ion diffusion and buffering volume expansion. Traditional methods suffer from low graphitization, long lithium-ion diffusion paths, or non-uniform structures.

Method used

By employing a water-in-oil emulsion confined coking strategy, and controlling the oil-water ratio, emulsion particle size, and coking conditions, small flake-like isotropic structures are formed. A stable interfacial film is constructed using a water-soluble carbon source and surfactants to prevent the mesophase from coalescing, thus forming an independent microreactor and achieving the preparation of isotropic coke.

Benefits of technology

The prepared isotropic coke, after graphitization, provides high capacity, high rate capability and long cycle life, abundant lithium-ion diffusion channels, and a uniform stress buffer structure, which significantly improves electrode performance.

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Abstract

The invention provides a preparation method of isotropic coke as well as a product and graphite obtained by the preparation method, and belongs to the technical field of coke material preparation. The preparation method of the isotropic coke comprises the following steps: 1) mixing a water-soluble carbon source, a surfactant and water to obtain a water-phase solution; 2) under physical emulsification conditions, slowly adding the oil phase into the water phase to form an oil-in-water emulsion; and 3) carrying out a coking reaction on the oil-in-water emulsion obtained in the step 2) to obtain the isotropic coke. According to the invention, an oil-in-water emulsion confinement coking strategy is adopted, the microtexture of coke is regulated and controlled from the source, so that the coke is mainly of a small-sheet isotropic structure, and the defects of poor fast charging performance and easy attenuation of circulation caused by a traditional needle coke fiber structure are overcome, so that the graphite material has high capacity, high magnification and long cycle life after being graphitized.
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