Method for embedding and stripping two-dimensional material by iodine-induced lithium

The photothermal co-excitation iodine-induced lithium intercalation method solves the safety and stability problems of intercalation exfoliation of two-dimensional layered materials, realizing efficient and safe large-scale preparation of two-dimensional materials, applicable to a variety of materials, and has the potential for industrial application.

CN122355281APending Publication Date: 2026-07-10HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610464213.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-09
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies for intercalating and exfoliating two-dimensional layered materials suffer from problems such as unstable intercalating agents and low process safety, especially posing safety risks and challenges to process stability during industrial scale-up.

Method used

Using lithium iodide-containing inorganic salts as intercalation media, the synergistic excitation of light and heat fields induces the oxidation and decomposition of halide ions and releases electrons, driving alkali metal ions to intercalate into the interlayer gaps. The gas expansion force generated by the hydrolysis reaction is used to peel off the two-dimensional material, avoiding high pressure hazards and solvent residues.

Benefits of technology

It has achieved efficient and safe large-scale preparation of two-dimensional materials with high product purity, applicable to a variety of materials, and has industrialization potential. It avoids the risks of high-pressure explosions and solvent residue problems, and has high versatility and high yield.

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Abstract

The invention relates to a method for embedding and stripping a two-dimensional material by iodine-induced lithium, which comprises the following steps: uniformly mixing a target block layered material with inorganic salt to obtain a mixture A; the inorganic salt contains lithium iodide; under a vacuum environment or a protective atmosphere, heating the mixture A to 280-400 DEG C, simultaneously applying ultraviolet irradiation, and carrying out solid lithiation treatment to obtain a mixture B; and dispersing the mixture B in deionized water, and carrying out hydrolysis stripping, separation, washing and drying to obtain the two-dimensional material. According to the method, inorganic salt containing lithium iodide is used as an intercalation medium, halogen ions are induced to be oxidized and decomposed and release electrons through the synergistic excitation effect of a light field and a thermal field, alkali metal ions are driven to be embedded into gaps of block layered material layers to achieve in-situ solid intercalation, then the ultrathin and large-transverse-size two-dimensional material is obtained through hydrolysis stripping, the process is safe, and the method is suitable for large-scale production. The intercalation efficiency is high, and the universality is good.
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