Composite negative electrode material doped with nitrogen / phosphorus / boron elements and preparation process thereof

By constructing a boron-phosphate oligomer framework in the liquid-phase precursor stage and forming a nitrogen-phosphorus-boron supramolecular precursor gel under high shear conditions, the problem of boron loss during high-temperature heat treatment was solved, achieving high graphitization and uniform coupling of active sites, thus improving the high-rate performance and production consistency of lithium-ion batteries.

CN121894653BActive Publication Date: 2026-06-05NINGDE NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGDE NORMAL UNIV
Filing Date
2026-03-23
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively suppress the loss of key catalytic elements during high-temperature heat treatment, making it difficult to achieve both high graphitization and high heteroatom retention rates. Furthermore, achieving uniform molecular-level coupling between the conductive network and active sites is challenging, impacting the high-rate performance and production consistency of lithium-ion battery anode materials.

Method used

By constructing a boron-phosphate oligomer framework in the liquid-phase precursor stage, volatile boron atoms are locked onto the thermally stable phosphate framework using POB covalent bonds. Under high shear conditions, a supramolecular precursor gel is formed with the nitrogen source melamine. Subsequently, during heat treatment, it is transformed in situ into a nitrogen-phosphorus-boron co-doped graphitized carbon coating layer, achieving molecular-level uniform coupling of the components.

Benefits of technology

The high-temperature retention rate of boron was improved, forming a highly conductive carbon framework and abundant active sites, which enhanced the fast-charging performance and electrochemical performance consistency of lithium-ion batteries and reduced the energy consumption of preparation.

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Abstract

The application relates to the technical field of lithium ion battery negative electrode material preparation, and discloses a kind of composite negative electrode material doped with nitrogen / phosphorus / boron element and a preparation process thereof, comprising: adding boric acid in phytic acid aqueous solution, controlling the reaction to jump the dynamic viscosity of system to a specific interval, to generate boron-phosphorus ester oligomer;The oligomer is hot injected into the hot saturated solution of melamine under high shear state, and the pH value is adjusted to induce the generation of nitrogen / phosphorus / boron supramolecular precursor gel adsorbed on the surface of negative electrode active substrate;After drying and high-temperature heat treatment, it is in-situ converted into a nitrogen-phosphorus-boron co-doped graphitized carbon coating layer, the application utilizes the thermal stability locking effect of P-O-B bonding network in boron-phosphorus ester oligomer on boron atom, to inhibit the volatilization of boron at high temperature.
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