Tin (Sn) Coated Copper Foil Roll as Anode-Free Battery Current Collector, CAFBCCTCFR
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Tin-coated copper foil is an advanced current collector material primarily used in high-performance lithium-ion, lithium-metal, and next-generation battery architectures. Unlike standard bare copper, which is susceptible to surface oxidation and interfacial instability, a tin (Sn) coating provides a lithiophilic (lithium-loving) interface that significantly improves electrochemical contact and cell longevity.
The primary goal of applying a tin layer to a copper substrate is to modify the surface chemistry to create a more stable, conductive, and uniform interface for lithium deposition or active material adhesion. (1) Lithiophilic Nucleation: Tin readily alloys with lithium to form a LixSn intermetallic layer. This acts as a "seed layer," lowering the energy barrier for lithium nucleation and promoting uniform, planar lithium plating instead of dendritic growth. (2) Enhanced Interfacial Adhesion: For silicon-based anodes—which undergo massive volume expansion (>300%) during cycling—the tin layer acts as a mechanical buffer and chemical bridge, improving the binding between the silicon particles and the current collector to prevent delamination. (3) Improved Corrosion Resistance: Tin provides a robust barrier against electrolyte-induced corrosion of the copper substrate, which is particularly critical in high-voltage battery systems or when using aggressive electrolyte additives. (4) Lower Contact Resistance: The formation of a metallic intermetallic bond between the anode material and the current collector reduces charge-transfer resistance, improving power density and rate capability.
| Part Number |
CAFBCCTCFR (C-AFBCC-TCFR) |
| Copper Foil Substrate |
T = 8 um, double-side shiny T = 9 um, double-side shiny T = 12 um, double-side shiny |
| Sn Coating Layer |
T =~2 um |
| Foil Size Options |
(1) Single-Side Coating: T(8+2) um * W220 mm * L23 m (2) Double-Side Coating: T(2+9+2) um * W280 mm * L18 m (3) Double-Side Coating: T(2+12+2) um * W340 mm * L15 m Other customized sizes can be supplied upon request. |
References:
- S. S. Zhang, et al., A tin-plated copper substrate for efficient cycling of lithium metal in an anode-free rechargeable lithium battery, Electrochimica Acta, 2017, 258, 1201-1207.
- H. Park, et al., Hierarchical micro-lamella-structured 3D porous copper current collector coated with tin for advanced lithium-ion batteries, Applied Surface Science, 2017, 399, 132-138.
- S. Zhang, et al., A three-dimensional tin-coated nanoporous copper for lithium-ion battery anodes, Journal of Power Sources, 2011, 196, 6915-6919.
