Sodium iron phosphate pyrophosphate (NFPP) cathode material

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Materials

　　Sodium iron pyrophosphate (also known as composite sodium iron phosphate, with the chemical formula typically written as Na4Fe3(PO4)2P2O7 and abbreviated as NFPP) is a novel cathode material for sodium-ion batteries, classified as a polyanionic compound. It contains two types of anionic groups—phosphate (PO4³⁻) and pyrophosphate (P2O7⁴⁻)—which are interconnected via Fe-O polyhedra to form a three-dimensional framework. Sodium ions are inserted into the interstitial spaces within this framework. The presence of pyrophosphate enhances the structural rigidity, thereby mitigating volume expansion during charge and discharge cycles. This material boasts advantages such as long cycle life, low cost, excellent low-temperature performance, and high safety, making it highly suitable for energy storage applications. However, it has faced challenges due to insufficient electrical conductivity. By employing strategies such as nanostructure design, the construction of composite conductive networks, and elemental doping, its performance has been significantly improved. In the future, with large-scale production and integration with new electrolyte systems, this material holds great promise for commercialization in both energy storage and power battery applications. Our company consistently regards research and development innovation as the lifeline for survival and growth, implementing a R&D matrix that encompasses “pre-researching one generation, developing another, and mass-producing yet another,” using innovation to drive iterative upgrades of battery materials.

　　In July 2024, our company produced the first-generation NFPP product, which combines the advantages of low cost, long cycle life, and high capacity. Its specific capacity ranges from 105 to 110 mAh/g, and its tap density reaches over 2.0 g/cm³. Through technological R&D and process optimization, our company began mass production of the first-generation product in October 2024.

　　In May 2025, building on our first-generation NFPP product and through continuous R&D and technological iteration, we significantly increased the material’s compaction density, enabling our second-generation NFPP material to exhibit even better processing performance. The specific capacity ranges from 110 to 120 mAh/g, and the compaction density has reached over 2.2 g/cm³. In July 2025, our second-generation NFPP product entered mass production. It boasts advantages such as low cost, high safety, long cycle life, wide temperature range, high compaction density, high rate capability, excellent consistency, and outstanding stability.

　　Meanwhile, our company continues to develop third-generation product technology (with a specific capacity exceeding 120 mAh/g, an average voltage greater than 3.4 V, and a tap density reaching 2.3 g/cm³). We have already begun introducing this technology into pilot-scale verification.

　　Our company’s NFPP material, through morphology control and the construction of a three-dimensional conductive network, has improved its compaction density, rate performance, and environmental stability. This material boasts advantages such as low cost, high safety, long lifespan, wide temperature range, high compaction density, high rate capability, excellent consistency, and outstanding stability, and has already received high recognition from numerous downstream companies. It has a broad range of applications, including energy storage, electric two- and three-wheeled vehicles, and start-stop power systems.