Titanium-doped iron phosphate and preparation method thereof, titanium-doped lithium iron phosphate, and battery

By controlling the amount and method of titanium doping, the problem of obtaining high-performance iron phosphate under low-temperature sintering conditions in titanium-doped lithium iron phosphate in the existing technology has been solved. This has resulted in iron phosphate products with high specific surface area, low sulfur content, and low moisture content, thus improving the electrochemical performance of the battery.

CN122102074APending Publication Date: 2026-05-29GUANGZHOU TINCI MATERIALS TECH +1
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGZHOU TINCI MATERIALS TECH
Filing Date
2024-11-29
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies make it difficult to obtain high specific surface area, low sulfur content, low moisture content, and non-hygroscopic iron phosphate products under low-temperature sintering conditions during the titanium doping process of lithium iron phosphate, which affects the electrochemical performance of the battery.

Method used

By controlling the amount and method of titanium doping, a titanium source was introduced in the early stage of iron phosphate synthesis. The pH value of the amorphous iron phosphate slurry was adjusted to 1.4-1.8. After adding the titanium source, crystallization treatment was carried out, followed by sintering at 550-650℃ to prepare titanium-doped iron phosphate with a trigonal crystal system.

Benefits of technology

It was achieved that iron phosphate products with high specific surface area, low sulfur content, low moisture content and low hygroscopicity were obtained under low temperature sintering conditions, which improved the conductivity of lithium iron phosphate materials and the reversible capacity and rate performance of batteries.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122102074A_ABST
    Figure CN122102074A_ABST
Patent Text Reader

Abstract

The application belongs to the technical field of lithium ion battery materials, and discloses a titanium-doped iron phosphate and a preparation method and application thereof. The titanium-doped iron phosphate contains titanium in an amount of 800-3000 ppm, and water in an amount of <3500 ppm, and the water content is <5000 ppm after exposure to air for 2 hours. Compared with the XRD characteristic peaks of pure-phase iron phosphate, the XRD characteristic peaks of the titanium-doped iron phosphate are shifted to low angles, and the lattice spacing is increased. The titanium-doped iron phosphate contains titanium in an amount of M Ti , sulfur in an amount of M s , specific surface area A, and water content M H2O , and satisfies 0.9 < M H2O × A × M s / (1000 M Ti ) < 1.5. In the preparation of the titanium-doped iron phosphate, by controlling the doping amount of Ti, high specific surface area, low sulfur content, low water content, and iron phosphate products which are not easy to absorb moisture can be obtained by low-temperature sintering. The lithium iron phosphate prepared by taking the iron phosphate product as a precursor can improve the discharge capacity, rate performance, and the like of a battery.
Need to check novelty before this filing date? Find Prior Art