Preparation method of copper-doped bi-crosslinked asphalt-based porous carbon and product and application of copper-doped bi-crosslinked asphalt-based porous carbon

By using copper-doped double crosslinked asphalt-based porous carbon as the substrate for silicon carbon anode material in lithium-ion batteries, the problem of electrochemical performance degradation caused by volume changes in silicon materials is solved, and the cost of porous carbon preparation is reduced, achieving high conductivity, excellent mechanical properties, and good cycle stability and rate performance.

CN119637845AActive Publication Date: 2025-03-18HUBEI JIANGXIN NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202411785555.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2025-03-18
Estimated Expiration
2044-12-06

AI Technical Summary

Technical Problem

In existing lithium-ion batteries, silicon, as the negative electrode material, has caused the material to powder and fall off due to volume expansion and contraction during the lithium-embedded deliquency process, and loses electrochemical performance. At the same time, the cost of porous carbon preparation process is high, which limits the development of industrialization.

Method used

Copper-doped double-crosslinked asphalt-based porous carbon is used as the substrate for silicon carbon anode material. By adding cuproamin solution and asphalt to the cellulose solution, the porous carbon with high conductivity and excellent mechanical properties is formed by preoxidation and crosslinking, pre-carbonization and activation treatment.

Benefits of technology

The high conductivity and mechanical properties of copper-doped double-crosslinked asphalt-based porous carbon are achieved, the cycle stability and rate performance of silicon carbon anode materials are enhanced, and the production cost is reduced.

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Abstract

The invention discloses a preparation method of copper-doped bi-crosslinked asphalt-based porous carbon, a product of the porous carbon and application of the porous carbon as a substrate to preparation of a silicon-carbon negative electrode material, the preparation method of the porous carbon comprises the following steps: S1, dissolving cellulose in a copper ammonia solution to obtain a uniform solution, then adding asphalt, and uniformly stirring; after fully mixing, heating and drying to obtain a copper ammonia cellulose and asphalt composite material; s2, heating the copper ammonia cellulose and asphalt composite material to perform pre-oxidation crosslinking, and then performing pre-carbonization treatment in a protective atmosphere to obtain a carbonized material; and S3, carrying out activating treatment on the carbonized material to obtain the copper-doped bi-crosslinked asphalt-based porous carbon. The pitch-based porous carbon prepared by the method disclosed by the invention has high conductivity and excellent mechanical properties, and the silicon-carbon negative electrode material prepared by taking the pitch-based porous carbon as the substrate has excellent cycling stability and rate capability.
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