Lithium Polymer (LiPo / LCO) vs. Nickel-Cadmium (NiCd)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Lithium Polymer (LiPo), commonly based on Lithium Cobalt Oxide (LiCoO2 / LCO), packages electrode stacks inside flexible multi-layer aluminum-laminate pouch cells rather than rigid metal cans. Operating at 3.7V–3.85V nominal (with High-Voltage LiHv variants reaching 4.35V–4.45V cutoff), LiPo offers unmatched peak discharge rates (up to 50C–100C continuous) for drones, RC modeling, and ultra-thin mobile hardware.
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.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Cell Voltage
|
3.70 – 3.85 V | 1.20 V |
|
Gravimetric Energy Density
|
200 – 250 Wh/kg | 45 – 65 Wh/kg |
|
Volumetric Energy Density
|
500 – 650 Wh/L | 120 – 160 Wh/L |
|
Cycle Life (to 80% Capacity)
|
300 – 600 Cycles | 1,000 – 2,000 Cycles |
|
Thermal Runaway Threshold
|
~150 °C | > 260 °C |
|
Operating Temperature Range
|
-10 to +60 °C | -40 to +60 °C |
|
Self-Discharge Rate
|
3 – 5% / Month | 15 – 20% / Month |
|
Primary Anode Material
|
Graphite | Metallic Cadmium (Cd) |
|
Primary Cathode Material
|
Lithium Cobalt Oxide (LiCoO2 / LCO) | Nickel Oxyhydroxide (NiOOH) |