The current battery market highlights three major technologies with distinct characteristics: Lithium-Ion, the dominant market reference; Semi-solid, which drastically reduces the amount of liquid electrolyte to maximize safety, and Sodium-Ion, which is emerging as a strategic alternative due to the raw material availability.
However, Sodium-Ion technology is not monolithic and features several cathode chemistries with distinct behaviors. To assist our customers in making technical decisions, SIG Energy Technology has conducted a comprehensive benchmark of Sodium-Ion cells released in 2025, tested and characterized within our laboratory. This testing campaign allows us to analyze the specificities of the two major options currently available on the market: NFPP and NFM.
Our laboratory test results reveal differentiated technical profiles for these two sub-chemistries:
NFPP (Iron Pyrophosphate): This chemistry relies on a polyanionic structure offering exceptional thermal stability and a long cycle life.
NFM (Layered Oxide): This variant stands out for its higher energy density, which is closer to current market standards.
Our benchmark highlights three key decision-making pillars for system designers: energy density, cycle life, and voltage range.
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<tr><th> <p style="color:white;">Chemistry</p></th><th><p style="color:white;">Energy density</th><th><p style="color:white;">Nominal voltage</th><th><p style="color:white;">Voltage range</th>
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<tr><td><b>NFPP</b></td><td>~ 95 Wh/kg<br</br></td><td>2.9 V</td><td>1.5 - 3.45 V</td>
<tr><td><b>NFM</b></td><td>~ 120 Wh/kg<br></td><td>3 V</td><td>1.5 - 3.95 V</td>
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</table>SIG Energy Technology’s commitment is built upon the scientific validation of emerging technologies. Leveraging the data from our Sodium-Ion benchmark helps guide cell selection toward the most suitable solution for the real-world performance, safety, and cost constraints of industrial projects.
For our customers wishing to study this benchmark or analyze the integration of these solutions, please contact us by email.