Sodium iron phosphate

Sodium iron phosphate Na₄Fe₃(PO₄)2(P₂O₇), also known as sodium ferric phosphate pyrophosphate (NFPP), is a NASICON-type mixed polyanionic cathode active material designed for sodium-ion batteries. It adopts an orthorhombic crystal structure (space group Pn21a) with an open framework featuring large tunnels, facilitating efficient sodium-ion transport essential for high-performance battery applications. NFPP exhibits a relatively flat voltage profile with two small plateaus at approximately 3.2 V and 2.9 V vs. Na/Na⁺, resulting in a nominal voltage around 3.1 V. Its theoretical capacity is approximately 129 mAh g⁻¹, based on the extraction of three Na⁺ ions per formula unit. The material displays exceptional structural stability, with minimal volumetric change of less than 4% during charge-discharge cycles, contributing to its long cycle life and safety. Our NFPP is a black, air-stable powder that simplifies handling and processing. It features a 3 wt% carbon coating, which enhances its electronic conductivity and rate performance. With a typical particle size of 5 μm (D50) and a surface area of approximately 10 m²/g, it is highly suitable for various battery manufacturing applications.

We are committed to bringing you Greener Alternative Products that adhere to one of the four categories of Greener Alternatives. This product belongs to the category of Enabling Products as it is an eco-friendly cathode material for sodium-ion batteries, known for its stability and durability. Its sustainable synthesis and composition support greener, safer, and long-lasting energy storage solutions. Click here for more information.

NFPP is an attractive cathode material for sodium-ion batteries, offering a cost-effective and sustainable alternative to lithium-ion systems. Its efficient sodium-ion transport and stable voltage profile enhance battery performance, providing high specific capacities even at fast charging and discharging rates. The nominal operating voltage of around 3.1 V is higher than many other sodium-ion cathode materials, improving the energy density of the battery. The exceptional structural stability of NFPP, with less than 4% volumetric change during operation, ensures excellent cycling stability and safety—key factors for high-energy-demand applications such as energy storage systems, electric vehicles, and power tools. Its air stability simplifies processing and reduces manufacturing complexities and costs.

These attributes make NFPP a promising candidate for next-generation, reliable energy storage solutions, meeting the growing demand for sustainable and efficient battery technologies.