Highly compacted lithium iron phosphate cathode material, and preparation method and application thereof

By employing a three-particle-size gradation technology, the compaction density and resistivity issues of lithium iron phosphate cathode materials were resolved, achieving high compaction density and low resistivity, thereby improving the energy density and electrochemical performance of the battery.

CN122403407APending Publication Date: 2026-07-17CHONGQING TERUI NEW ENERGY MATERIALS CO LTD
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Patent Information

Application Number
CN202610754279.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-28
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing lithium iron phosphate cathode materials have limited compaction density improvement and high resistivity, making it difficult to increase volumetric energy density within a limited space.

Method used

The three-particle-size gradation technology is used to divide the lithium iron phosphate material after the first sintering into crushed materials of different particle sizes. These materials are then ball-milled into slurries, mixed, and sintered a second time to form a compacted packing model, which increases the compaction density and reduces the resistivity.

Benefits of technology

High solid density (2.6 g/cm3) and low resistivity (9.7 Ω·cm) were achieved, improving the energy density per unit volume and electrochemical performance of the battery.

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Abstract

本发明属于电池制备技术领域，具体涉及一种高压实磷酸铁锂正极材料及其制备方法和应用，其制备方法包括：（1）将一次烧结得到的磷酸铁锂材料分为第一破碎料、第二破碎料和第三破碎料；第一破碎料、第二破碎料和第三破碎料的质量比为（3.8‑4.2）：（3.8‑4.2）：（1.6‑2.4）；（2）将第一破碎料球磨得第一浆料，第二破碎料球磨得第二浆料，第三破碎料球磨得第三浆料；第一浆料的粒径D50＜第二浆料的粒径D50＜第三浆料的粒径D50；（3）将第一浆料、第二浆料和第三浆料进行二次烧结得高压实磷酸铁锂正极材料。该正极材料压实密度高，可以达到2.6g / cm3，且电化学性能优异。
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