Custom PET Double-Sided Composite Copper Foil | Lithium-Ion Battery Current Collector for R&D & Prototyping

Custom PET Double-Sided Composite Copper Foil

Introduction

1. PET double-sided composite copper foil is a functional current collector material in which a thin PET (polyethylene terephthalate) film is laminated to both sides of an ultra-thin copper foil. The copper layer provides excellent electrical conductivity and acts as the main current collector, while the PET layers offer mechanical reinforcement, insulation, and improved puncture and tear resistance. This structure helps enhance safety and dimensional stability in lithium-ion cells and is widely used in R&D cells, experimental coin/pouch/stacked batteries, and specialty lithium-based systems where mechanical robustness and handling convenience are important.

2. We offer customizable PET composite copper foil for laboratory and small-scale production, including adjustable copper thickness (e.g., 4–12 µm), PET thickness, width, and total laminate thickness. Surface treatment options (such as roughened, treated, or coated copper surfaces) can be provided to improve adhesion with active materials and binders. Rolls or cut sheets are available to match your electrode coating and cell assembly process. Our materials are produced in reference to common lithium-ion battery copper foil and PET film standards, and we provide technical support to help researchers select suitable specifications for new cathode/anode designs, solid-state concepts, or prototype cell development.

   Specifications

   Type	PET Double‑Sided Composite Copper Foil / PET–Cu–PET Laminate / Lithium‑Ion Battery Current Collector (R&D & Prototype Use)
   Structure	Sandwich structure of PET/Cu/PET: ultra‑thin copper foil laminated between two PET (polyethylene terephthalate) films; copper as current collector, PET as mechanical and electrical barrier layers
   Base Materials	Copper foil: high‑purity battery‑grade copper (typically ≥ 99.9% Cu); PET film: electrical‑grade biaxially oriented PET (BOPET)
   Copper Thickness	Customizable copper thickness, typically from about 4 μm to 12 μm (other thicknesses available on request for special cell designs)
   PET Thickness (each side)	Customizable PET film thickness, commonly 6–25 μm per side (total PET 12–50 μm); selected according to mechanical strength and insulation requirements
   Total Laminate Thickness	Determined by Cu + 2×PET; typical total thickness range approx. 20–80 μm depending on configuration
   Electrical & Thermal Props.	Copper core provides low resistivity and good in‑plane thermal conductivity, suitable as a current collector for laboratory Li‑ion, Li‑metal, or solid‑state cell research
   Mechanical Properties	PET layers improve tensile strength, tear resistance, and handling robustness; laminate has better puncture resistance and dimensional stability than bare ultra‑thin copper foil
   Surface Options (Cu side)	Bare, treated/roughened, or coated copper surface to enhance adhesion with electrode slurry (active material + binder); one‑side or both‑side active coating compatible
   Insulation & Barrier	PET layers provide electrical insulation and barrier properties (against shorting, metal migration, and some moisture/chemical ingress) depending on stack design
   Form	Supplied in rolls (coils) or cut sheets; suitable for lab coaters (slot‑die, doctor blade, comma bar) and small pilot lines
   Width & Length	Width typically from 50 mm up to about 500–700 mm for R&D and pilot use (wider on request); roll length according to thickness and order specification
   Dimensional Tolerances	Tight control of copper and PET thickness, width, and flatness to ensure uniform coating, calendering, and slitting in laboratory and small‑scale production
   Thermal Stability	PET layer usable in typical electrode drying and calendaring conditions for Li‑ion R&D (within PET temperature limits); copper layer stable over common processing temperatures
   Application Range	Lithium‑ion and emerging lithium‑based cells (coin/pouch/prismatic prototypes), solid‑state and semi‑solid cells, lab‑scale current collectors, safety/insulation structures, and experimental designs
   Processing Capability	Suitable for slitting, die‑cutting, punching, and laser cutting; compatible with standard electrode coating, drying, calendaring, stacking/winding, and lab‑scale cell assembly
   Standards & Reference	Manufactured with reference to common battery copper foil standards (e.g., ASTM/EN for Cu foil) and PET film standards; specific property data (tensile, resistivity, breakdown) available on datasheet
   Customization	Tailored Cu and PET thickness, laminate structure (e.g., PET/Cu, PET/Cu/PET), roll width/length, surface treatment, and sheet formats according to customer drawings or process requirements
   Packaging	Supplied in clean, dust‑protected rolls or sheets; vacuum or moisture‑barrier packing with edge protection; carton or wooden‑case packaging for safe storage and transport

Reference dimensions