Lithium Iron Phosphate (LFP) vs. Sodium-Ion (Na-Ion)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Lithium Iron Phosphate (LiFePO4 / LFP) is a cobalt-free, nickel-free lithium-ion chemistry operating at 3.2V nominal with an extraordinarily stable olivine crystal structure. LFP delivers industry-leading cycle life (3,000–6,000+ cycles) and unmatched thermal runaway tolerance (>270°C), making it the gold standard for grid energy storage (ESS), marine power, and standard-range electric vehicles.
Sodium-Ion (Na-Ion) chemistry replaces lithium with abundant, low-cost sodium compounds. Operating at 3.0V–3.1V nominal with energy densities of 140–160 Wh/kg, Na-ion cells deliver exceptional low-temperature capacity retention (>85% at -20°C, operable down to -40°C), zero thermal runaway risk at 0V discharge, and use aluminum current collectors on both cathode and anode.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Cell Voltage
|
3.20 V | 3.00 – 3.10 V |
|
Gravimetric Energy Density
|
140 – 180 Wh/kg | 130 – 165 Wh/kg |
|
Volumetric Energy Density
|
320 – 420 Wh/L | 260 – 340 Wh/L |
|
Cycle Life (to 80% Capacity)
|
3,000 – 6,000+ Cycles | 2,000 – 4,000 Cycles |
|
Thermal Runaway Threshold
|
> 270 °C | > 260 °C |
|
Operating Temperature Range
|
-20 to +65 °C | -40 to +60 °C |
|
Self-Discharge Rate
|
< 1.5% / Month | 2 – 3% / Month |
|
Primary Anode Material
|
Graphite / Carbon | Hard Carbon (Biomass-derived Non-graphitizable Carbon) |
|
Primary Cathode Material
|
Lithium Iron Phosphate (LiFePO4) | Prussian White Analogues / Layered Transition Metal Oxides (NaMO2) |