Heat Resistance
Surface remains untarnished up to 140 ¡ãC
Low sheet resistance
<30 m?/cm?
Sustainable process
Cr(VI)-free and fully compliant with REACH and RoHS
- Fully compliant with REACH/RoHS; Cr(VI)-free
- Ultra-thin coating (1¨C3 nm)
- Low sheet resistance (<30 m?/cm?)
- Heat resistant up to 140 ¡ãC
- High humidity resistance (30 days at 60 ¡ãC/90% RH)
- Proven stability under C-rate Coulombic testing
- Production flexibility
- Scalable for high-speed lines
- Compatible with reel-to-reel processes
- No impact on battery electrochemistry or performance
CuProtect XL
Advanced corrosion protection for copper current collector foils in Lithium-ion batteries
CuProtect XL is an advanced post-treatment technology that significantly enhances the performance and durability of copper components. By applying a nanometer-thin (1¨C3 nm) chromium layer from a Cr(III)-based electrolyte, the passivate ensures compliance with REACH and RoHS regulations, being completely free of Cr(VI).
The CuProtect XL treatment offers superior heat resistance, preventing discoloration. Additionally, it provides high corrosion resistance, with no visible oxidation. The CuProtect XL technology maintains electrical integrity, keeping sheet resistance reliably below 30 m?/cm?. Furthermore, its versatility makes it compatible with various production methods, including reel-to-reel operations.
What inspires us
Why we developed CuProtect XL
Your challenge
Copper, though highly conductive and essential in battery technologies, is susceptible to surface oxidation when exposed to ambient conditions. This leads to the formation of Cu(I) and Cu(II) oxides, commonly known as tarnish. Tarnishing increases surface resistance, compromising the integrity of electric connections and resulting in decreasing battery efficiency. This degradation can affect the reliability and longevity of the battery¡¯s current collector. Traditional passivation methods using hexavalent chromium are being phased out due to regulatory restrictions.
Our solution
CuProtect XL presents a Cr(VI)-free alternative that offers superior anti-tarnish protection through an ultra-thin Cr(III) layer, ensuring performance stability under demanding conditions. The cutting-edge post-treatment technology significantly enhances the performance and durability of the current collector copper foil. By applying a nanometer-thin (1¨C3 nm) chromium layer from a Cr(III)-based electrolyte, the passivate ensures compliance with REACH and RoHS regulations, being completely free of Cr(VI).
