Processing method of high-conductivity ultrathin carbon layer high-compaction lithium iron phosphate

By constructing lithium iron phosphate materials with ultrathin carbon layers and Ti-N doped structures, the problems of low compaction density and difficulty in achieving both conductivity caused by excessive carbon coating were solved, resulting in high compaction density and excellent electrochemical performance, while reducing energy consumption and production cycle.

CN122079102APending Publication Date: 2026-05-26YUNNAN YINGHE NEW ENERGY MATERIALS CO LTD
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Patent Information

Application Number
CN202610124261.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-29
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing lithium iron phosphate materials have low compaction density due to excessive carbon coating, and it is difficult to balance conductivity and compaction density. Traditional production processes are energy-intensive, have long cycles, and require strict control of sintering temperature and atmosphere.

Method used

Porous carbon sources were prepared by wet ball milling and combined with an in-situ doping system. By constructing an ultrathin carbon layer and a Ti-N doped structure, a conductive framework rich in mesopores was formed, which shortened the lithium-ion diffusion path and optimized the crystal structure.

Benefits of technology

It achieves high compaction density and excellent electrochemical performance with low carbon content, reduces energy consumption and production costs, shortens the production cycle, and maintains high conductivity.

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Abstract

The invention provides a processing method of high-conductivity ultrathin carbon layer high-compaction lithium iron phosphate, and relates to the technical field of lithium ion battery material preparation, the method comprises the following steps: mixing asphalt, phenolic resin and sodium chloride through a wet ball milling method, carbonizing, and using sodium chloride as a pore-forming template to prepare a first carbon source with a porous structure; then mixing iron phosphate, a lithium source, a phosphorus source and titanium citrate serving as a second carbon source, and regulating the pH value to 8-10 to induce the structure change of the titanium citrate so as to realize lattice titanium doping; and finally, adding a first carbon source into the mixed solution, grinding, drying and sintering in an inert atmosphere to prepare the lithium iron phosphate positive electrode material. Through the synergistic effect of double carbon sources and the pH regulation and control process, the problem of low compaction density caused by too thick carbon layers is effectively solved, and high compaction density and excellent electrochemical performance are achieved while the conductivity and the ion diffusion rate of the material are remarkably improved.
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