Lithium iron phosphate positive electrode material preparation method and lithium iron phosphate positive electrode material
By employing a multi-stage airflow pulverization and gradient mixing method, the compaction density and cost issues of lithium iron phosphate cathode materials have been resolved, achieving high compaction density and excellent electrochemical performance, simplifying the process and reducing production costs.
CN122403402APending Publication Date: 2026-07-17HUBEI RUIPAI NEW ENERGY TECHNOLOGY CO LTD
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-07
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
The existing lithium iron phosphate cathode material has a complex and costly manufacturing process and a low compaction density, making it difficult to meet the requirements of fourth-generation high-compaction products.
Method used
A multi-stage airflow pulverization and gradient mixing preparation method was adopted. By optimizing the pulverization-mixing-re-sintering process and combining the Andreasen model for particle size distribution and secondary sintering, the compaction density and electrochemical performance of the material were improved.
Benefits of technology
The compaction density of lithium iron phosphate cathode material reached over 2.65 g/cm3, and the 1C discharge capacity reached 145 mAh/g, simplifying the process and reducing production costs.
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Figure CN122403402A_ABST
Abstract
A kind of preparation method of lithium iron phosphate anode material based on multi-stage airflow crushing and gradient mixing, which uses iron phosphate, lithium carbonate and doped metal compounds as raw materials to form slurry A with non-ion water;Carbon source is added to non-ion water to form solution B;B is added to A to form mixed slurry C.C is sand ground, and its particle size D50 is in the interval of 200nm-500nm;Then in the spray drying tower, the slurry is dried to obtain powder D;Then D is heat treated at high temperature under nitrogen atmosphere to obtain lithium iron phosphate sintered material E;E is crushed by airflow crusher to obtain four kinds of powder a, b, c, d with particle size from low to high;After a, b, c, d are mixed uniformly at a certain ratio, high-temperature heat treatment is carried out to obtain high-density lithium iron phosphate anode material with compactness density up to 2.65g / cm 3 The above high compactness density type lithium iron phosphate anode material has a 0.1C discharge gram capacity of 156mAh / g or more and a 1C discharge gram capacity of 145mAh / g or more.The present application can effectively improve the compactness density of lithium iron phosphate anode material, and has simple process and low production cost.
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