| Item | Pure nickel Ni200 / Ni201 | Nickel-plated steel |
|---|---|---|
| Conductivity* | ~20–25% IACS | Core ~3% IACS; plating improves contact |
| Resistance and heating | Low resistance, low heating | Higher resistance, visible heating at high current |
| Welding | Stable ultrasonic welding to Ni/Al tabs | Weldable but narrower process window |
| Relative cost | High; exposed to nickel price | 30–50% of pure nickel |
| Best for | Power cells, high rate, long tabs | Consumer cells, low rate, short tabs |
* Industry-typical values; confirmed per batch on the Mill Test Certificate.
| Condition | Recommendation |
|---|---|
| Discharge rate > 3C | Pure nickel |
| Discharge rate < 1C | Nickel-plated steel acceptable |
| Tab length > 30 mm | Pure nickel (resistance accumulates over length) |
| Long cycle-life reliability required | Pure nickel |
| Cost-critical, high volume, short tabs | Nickel-plated steel |
| Drawing specifies Ni200/Ni201 | Follow the drawing, no substitution |
Battery copper foil and shielding/conductive copper foil follow different process routes and cannot be quoted interchangeably.
| Product | Process | Typical thickness | Use |
|---|---|---|---|
| Li-ion copper foil | Electrodeposited | 6–9 μm (power cells trending to 4.5 μm) | Anode current collector |
| Li-ion aluminium foil | Rolled | 12–16 μm | Cathode current collector |
| Rolled copper foil | Rolled | from 0.005 mm (5 μm) | Shielding, conduction, available with adhesive |
Thinner foil raises energy density and lowers unit cost but demands tighter tension control in coating and winding, increasing breakage risk. Where equipment precision cannot keep up, yield loss at thin gauges can consume the entire material saving. Our focus is rolled copper foil and shielding/conduction foils; Li-ion current collector foil is supplied to order.
It comes down to rate capability and welding requirements — performance versus cost. Pure nickel (Ni200/Ni201) conducts at ~20–25% IACS with low resistance and heating, and welds reliably to aluminium or nickel tabs, making it the default for high-rate, power battery and long-reliability applications. The downside is price and nickel price exposure.
Nickel-plated steel uses a low-carbon steel core with a nickel layer improving contact resistance and solderability at 30–50% of the cost — suitable for low-rate consumer cells, though the steel core brings higher resistance and heating at high current. Above 3C, or tabs over 30 mm, go pure nickel.
Consumer Li-ion copper foil sits mainly at 6–9 μm; power battery foil has moved from 8 μm toward 6 μm and even 4.5 μm, while aluminium current-collector foil is typically 12–16 μm.
Thinner foil raises energy density and lowers unit cost, but demands tighter tension control and increases breakage risk. It is not automatically better — where equipment precision falls short, yield loss at 6 μm can consume the entire material saving.
Yes, to the customer drawing, with an inspection report by X-ray fluorescence and cross-section verification where required. The nickel layer improves contact resistance and solderability: too thin and soldering fails, too thick and cost rises while bending may be affected.
The tolerance band affects cost more than the nominal value — agree it before quoting.
Comparative sampling of both tab materials with MTC and plating reports for your reliability validation.