Nickel-Cadmium (NiCd) vs. Silicon-Carbon (Si-C)
Comparing 2 standards across 9 specifications. 9 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.
Silicon-Carbon (Si-C) battery chemistry incorporates a porous silicon-carbon composite matrix into the anode, enabling theoretical lithium capacity up to 4,200 mAh/g (vs 372 mAh/g for pure graphite). Operating at 3.7V–3.8V nominal, commercial Si-C cells achieve gravimetric energy densities of 300–350+ Wh/kg and volumetric densities exceeding 850 Wh/L in ultra-slim smartphone and EV pouch formats.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Cell Voltage
|
1.20 V | 3.70 – 3.80 V |
|
Gravimetric Energy Density
|
45 – 65 Wh/kg | 300 – 360 Wh/kg |
|
Volumetric Energy Density
|
120 – 160 Wh/L | 800 – 900 Wh/L |
|
Cycle Life (to 80% Capacity)
|
1,000 – 2,000 Cycles | 800 – 1,200 Cycles |
|
Thermal Runaway Threshold
|
> 260 °C | ~160 – 210 °C |
|
Operating Temperature Range
|
-40 to +60 °C | -20 to +60 °C |
|
Self-Discharge Rate
|
15 – 20% / Month | 1 – 2% / Month |
|
Primary Anode Material
|
Metallic Cadmium (Cd) | Porous Silicon-Carbon (Si-C) Composite (10–30% Si) |
|
Primary Cathode Material
|
Nickel Oxyhydroxide (NiOOH) | High-Nickel NMC (Nickel Manganese Cobalt) / LCO |