High-efficiency carbon black material capable of reducing use amount of lithium iron phosphate conductive agent and preparation method of high-efficiency carbon black material

By loading conductive polymers and adsorbent interface activators onto the surface of carbon black, a directional conductive structure was constructed, solving the conductivity and dispersion problems of lithium iron phosphate cathode materials and achieving high-efficiency conductivity and improved energy density.

CN121506912APending Publication Date: 2026-02-10内蒙古玄电新材料有限公司
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Patent Information

Application Number
CN202511753210.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-26
Publication Date
2026-02-10

AI Technical Summary

Technical Problem

Existing lithium iron phosphate cathode materials suffer from low conductivity and slow lithium-ion diffusion rate, which limits high-rate performance and energy density. Traditional carbon black conductive agents require high dosages and suffer from poor dispersibility and electrode structure, resulting in complex processes and high costs.

Method used

By loading conductive polymers onto the surface of carbon black and adsorbing desorbable interfacial activators, a synergistic conductive structure is constructed, enabling the conductive agent to be directionally distributed in the electrode, reducing the amount added while maintaining excellent conductivity and electrode compatibility.

Benefits of technology

It significantly improves conductivity and rate performance at low addition levels, enhances electrode dispersion and structural compactness, increases energy density and cycle stability, and reduces material costs.

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Abstract

The invention belongs to the technical field of lithium ion battery positive electrode materials, and discloses an efficient carbon black material capable of reducing the use amount of a lithium iron phosphate conductive agent and a preparation method thereof.The material is composed of a carbon black matrix, a conductive polymer and a desorbable interface activator, and the conductive polymer is loaded on the surface of carbon black in an in-situ polymerization mode; the interfacial activator can be released in the electrode preparation process and assists in constructing a conductive network. The material has excellent dispersibility in a slurry system, can realize preferential distribution of carbon black on active substance particles and a current collector interface, and constructs an efficient electronic path, thereby significantly improving the conductive efficiency. According to the material disclosed by the invention, the addition amount of the conductive agent in a lithium iron phosphate positive electrode can be reduced to 0.8-1.5% from 3-5% in the prior art, and the electrode energy density is effectively improved while the high-rate performance and the cycling stability are maintained. The preparation process is simple, the raw materials are controllable, and the method is suitable for large-scale application and has wide engineering application prospects.
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