Low-magnetic foreign matter spherical lithium iron phosphate positive electrode material, preparation method thereof and lithium ion battery
By preparing spherical lithium iron phosphate cathode materials with low magnetic foreign matter content through spherical forming and gradient sintering processes, the problems of low material compaction density, high magnetic foreign matter content and unstable crystal form in energy storage scenarios are solved, and lithium-ion batteries with high energy density and long cycle life are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUNAN CHANGYUAN LICO NEW ENERGY CO LTD
- Filing Date
- 2026-06-09
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies make it difficult to prepare spherical lithium iron phosphate cathode materials with high real density, low magnetic foreign matter content and stable crystal form in energy storage scenarios, resulting in low cell volumetric energy density, poor safety and short cycle life.
A spherical lithium iron phosphate cathode material with low magnetic foreign matter was prepared by using a spherical forming process and a three-stage gradient sintering process through spray drying and gradient sintering. The process includes low-temperature pre-sintering, medium-temperature crystallization and high-temperature densification steps, combined with airflow deagglomeration and sieving demagnetization to control particle morphology and the generation of magnetic materials.
It achieves high solid density (≥2.55 g/cm³), low magnetic foreign matter content (≤50 ppb) and stable crystal structure, improving battery safety and cycle life, while also possessing excellent rate performance and processing performance.
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