Highly compacted density pyrophosphate sodium ferric phosphate cathode material and preparation method thereof
By preparing a highly active amorphous FePO4·xH2O and mixing it with a phosphorus source, a supplementary sodium source, and a carbon source to form a precursor and then performing sintering treatment, the problem of low compaction density of sodium iron phosphate pyrophosphate cathode material was solved, thereby improving the energy density and electrochemical performance of sodium-ion batteries.
CN119929768BActive Publication Date: 2026-06-09HUBEI WANRUN NEW ENERGY TECH CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUBEI WANRUN NEW ENERGY TECH CO LTD
- Filing Date
- 2025-01-24
- Publication Date
- 2026-06-09
AI Technical Summary
Technical Problem
The existing sodium iron phosphate pyrophosphate cathode material has a low compaction density, resulting in insufficient energy density in sodium-ion batteries and limiting their application.
Method used
A precursor is prepared by mixing highly active amorphous FePO4·xH2O with a phosphorus source, a supplementary sodium source, and a carbon source. The precursor is then sintered to fuse the primary particles into dense secondary particles, thereby increasing the compaction density of the material.
Benefits of technology
A high density of sodium iron phosphate pyrophosphate cathode material was achieved, which improved the energy density and electrochemical performance of sodium-ion batteries.
✦ Generated by Eureka AI based on patent content.
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Abstract
The application provides a high-compaction-density sodium iron pyrophosphate positive electrode material and a preparation method thereof, and belongs to the field of sodium ion batteries. The preparation method of the high-compaction-density sodium iron pyrophosphate positive electrode material comprises the following steps: preparing amorphous FePO4xH2O, wherein 1≤x≤4; mixing the amorphous FePO4xH2O with a phosphorus source, a supplementary sodium source, a carbon source and a solvent to obtain a first slurry; performing dispersion and drying treatment on the first slurry to obtain a precursor; and performing sintering treatment on the precursor to obtain the sodium iron pyrophosphate positive electrode material. The method provided by the application can fuse primary particles into secondary particles with a high compactness, and the compaction density of the sodium iron pyrophosphate positive electrode material prepared by the method can reach 2.0-2.2 g / cm 3 , effectively solving the technical problem of low compaction density of the sodium iron pyrophosphate positive electrode material, and making the sodium ion battery prepared from the positive electrode material have a high energy density.
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