Nickel-Cadmium (NiCd) vs. Sodium-Ion (Na-Ion)
Comparing 2 standards across 9 specifications. 7 key differences identified.
Nickel-Cadmium (NiCd) is a mature, exceptionally rugged alkaline secondary chemistry operating at 1.2V nominal. Renowned for sustaining massive pulse discharge currents, operating reliably in deep sub-zero temperatures (-40°C), and enduring harsh electrical abuse, NiCd remains in service for aircraft backup power, emergency lighting, and legacy industrial systems.
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
|
1.20 V | 3.00 – 3.10 V |
|
Gravimetric Energy Density
|
45 – 65 Wh/kg | 130 – 165 Wh/kg |
|
Volumetric Energy Density
|
120 – 160 Wh/L | 260 – 340 Wh/L |
|
Cycle Life (to 80% Capacity)
|
1,000 – 2,000 Cycles | 2,000 – 4,000 Cycles |
|
Thermal Runaway Threshold
|
> 260 °C | > 260 °C |
|
Operating Temperature Range
|
-40 to +60 °C | -40 to +60 °C |
|
Self-Discharge Rate
|
15 – 20% / Month | 2 – 3% / Month |
|
Primary Anode Material
|
Metallic Cadmium (Cd) | Hard Carbon (Biomass-derived Non-graphitizable Carbon) |
|
Primary Cathode Material
|
Nickel Oxyhydroxide (NiOOH) | Prussian White Analogues / Layered Transition Metal Oxides (NaMO2) |