Pure nickel foil is a thin sheet metal material made of high-purity nickel, featuring excellent corrosion resistance, high melting point, electrical conductivity and mechanical strength. It is made through processes such as smelting, rolling, peeling, annealing and foil rolling to ensure the high purity and excellent performance of the material.
Our company also undertakes all kinds of slitting business. We have a professional dust-free slitting workshop and technical services such as mirror-finish zero-burr foil slitting.

Pure nickel foil is widely used in fields such as electronics, aerospace, energy storage, medical equipment and the automotive industry. In the electronics industry, it is often used as the positive and negative current collectors for lithium-ion batteries and nickel-metal-hydride batteries, providing stable current transmission and efficient energy conversion. In the aerospace field, pure nickel foil is used to manufacture key components such as turbine blades and engine parts due to its high strength and resistance to extreme temperatures.

Pure nickel foil is also applied in the medical field due to its excellent biocompatibility and corrosion resistance, such as in the manufacture of medical implants and surgical instruments. Its excellent electrical conductivity, thermal conductivity and ductility also make pure nickel foil an ideal choice for a variety of industrial applications.

The processing technology of nickel foil is rather complex and is mainly prepared through rolling and stretching. Due to its extreme thinness and flexibility, it needs to be processed on high-precision equipment to ensure its surface finish and dimensional accuracy. For high-grade nickel foil products, heat treatment and surface treatment are also required to enhance their mechanical properties and corrosion resistance.

We mainly produce N6 pure nickel strips with a thickness of 0.008-10mm and a width of 1.5-450mm. The thickness of the rolled pure nickel foil is 0.008-0.01-0.02-0.03mm, and the width is 100-200-250mm.

FAQ

Q: What are the influences of nickel foil purity on its quality?

1: Electrical conductivity

The purity of nickel foil directly affects its electrical conductivity. Nickel foil with a purity of ≥99.96% has a lower resistivity and higher current transmission efficiency, making it suitable for high-precision electronic components such as battery tabs and RF shielding layers. For instance, the conductivity of N4 nickel strips (with a purity of 99.98%) is superior to that of N6 nickel strips (99.5%), which can reduce energy loss in new energy batteries

2:Corrosion resistance difference

The stability of high-purity nickel foil (such as 99.99%) has been significantly improved in acidic and alkaline environments. Excessive content of impurities (such as sulfur and carbon) will lead to an increase in the sensitivity of grain boundary corrosion. For example, when the carbon content is greater than 0.02%, it may cause intergranular corrosion and shorten the lifespan of the device.

3:Change in mechanical properties ‌

A decrease in purity will lead to an imbalance between hardness and toughness. Nickel foils with a relatively high content of iron and copper impurities (such as N6) can have a tensile strength of up to 380MPa, but their elongation is only 40%. In contrast, when N4 has a higher purity, it can balance strength (320MPa) and plasticity (45% elongation).

Q: How to distinguish different purities of nickel foil?

A: 1. Observe the color and surface
Pure nickel foil usually has a uniform silvery-white color and a smooth, uniform surface. If other colors are exposed at the edges or during scraping (such as brass color might indicate nickel-plated copper, and iron gray might indicate nickel-plated iron), the purity is questionable.
2. Weigh the item
The density of pure nickel is approximately 8.9 g/cm³. At the same size, pure nickel foil will be significantly heavier than nickel-plated iron sheets, and it feels heavy in hand.
3. Saltwater immersion test
Cut the nickel foil and immerse it in saturated salt water. Observe after a few hours. Pure nickel is corrosion-resistant and should show no significant changes; if the water turns light green, it might be nickel-plated copper; turning yellow indicates nickel-plated iron.
4. Measure resistance
Use a high-precision multimeter to measure. At the same size, the resistance of pure nickel is the smallest, and the resistance of nickel-plated iron sheet is about 1.4 times that of pure nickel.
5. Magnet test
Pure nickel is magnetic, but its magnetism is weaker than that of iron. This method can only assist in the judgment and cannot distinguish pure nickel from nickel-plated iron sheets.

Q: What are the differences in thermal properties between N4/N6 electrolytic nickel foil and rolled nickel foil?

A: The N4 and N6 electrolytic nickel foils have little difference in thermal properties. The main difference lies in purity. The purity of N4 is ≥ 99.5%, while that of N6 is ≥ 99.0%. Due to its higher purity, N4 has a lower resistivity (0.069 μΩ·m) and a higher thermal conductivity (91 W/m·K), meaning better electrical and thermal conductivity. N6 nickel, however, has a slightly higher impurity content and a slightly lower thermal conductivity (87 W/m·K).
Rolled nickel foils are produced through mechanical rolling processes. Their thermal properties (such as thermal conductivity and resistivity) mainly depend on the purity of the nickel and are similar to those of N4/N6 electrolytic nickel foils produced by electrolysis at the same purity level. For example, the thermal conductivity of N4 rolled nickel foil is comparable to that of electrolytic N4 nickel foil, but specific values should be referred to the test reports of the specific products.
When purchasing, if extremely high requirements are placed on thermal and electrical conductivity (such as for precision electronic components), it is recommended to choose N4 electrolytic nickel foil. If the budget is limited and purity requirements are not strict, N6 or rolled nickel foil are economical choices.

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