Battery supporting materials
Single-Sided and Double-Sided Lithium Copper Composite Foil Strip for Solid-State Battery Anode Current Collectors
Item Number : FZ20
Price varies based on specs and customizations
- Lithium Purity
- ≥99.9%
- Total Composite Thickness
- 0.031 mm (Single-Sided) / 0.053–0.054 mm (Double-Sided)
- Copper Margin Width
- 10.0 ± 1.0 mm (Both Edges)
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Product Overview
This high-precision lithium copper composite foil represents an advanced anode current collector engineered specifically for next-generation energy storage systems. Formed through metallurgical solid-state composite bonding of ultra-thin, high-purity metallic lithium foil directly onto an electronic-grade copper foil substrate, this material eliminates the need for standalone, fragile lithium foil handling during cell assembly. By stabilizing the anode interface and providing an integrated electron conduction pathway, the composite strip significantly minimizes internal cell impedance, streamlines the manufacturing line, and maximizes volumetric energy density in high-energy lithium metal designs.
Engineered primarily for solid-state battery research, pre-lithiation architectures, and commercial pouch or prismatic cell manufacturing, this composite material meets the rigorous demands of automotive electrification, aerospace power systems, and high-rate electronic devices. Its precisely pre-engineered copper edge margins facilitate clean, robust ultrasonic tab welding without disrupting the active lithium layer, providing battery engineers with an industrial-grade solution for both laboratory prototyping and continuous pilot-scale roll-to-roll electrode fabrication.
Manufactured under strictly controlled environmental parameters and dry-room standards, this composite current collector delivers exceptional chemical stability, structural integrity, and uniform surface passivation. Every production batch undergoes rigorous quality assurance to eliminate interfacial delamination, pinholes, and chemical inclusions, ensuring repeatable electrochemical stripping and plating performance, uniform current density distribution, and extended cycle life even under aggressive operating conditions.
Key Features
- Precision Solid-Phase Composite Welding: Advanced metallurgical cladding technology metallurgically bonds metallic lithium to the copper substrate with zero void formation, ensuring zero interfacial delamination and exceptionally low electrical contact resistance across the entire strip length.
- Ultra-High Chemical Purity: Formulated with a lithium metal purity of ≥99.9% and trace alkali/transition metal impurities tightly restricted (Na ≤ 0.020%, N ≤ 0.020%, Ca ≤ 0.020%, Fe ≤ 0.005%), preventing parasitic chemical reactions and suppressing premature dendrite growth during cycling.
- Pristine, Defect-Free Surface Morphology: The lithium deposition exhibits a bright, uniform metallic luster completely free of oxidation films, nitrides, oil residues, pinholes, wrinkles, cracks, or mechanical crease marks, providing an optimal surface for solid electrolyte contact.
- Integrated Non-Coated Edge Margins: Engineered with symmetrical, bare copper margin zones (10.0 ± 1.0 mm) on both left and right edges to facilitate direct, defect-free ultrasonic tab welding and edge insulation without damaging the active lithium layer.
- Optimized Ultra-Thin Profile: Available in single-sided (31 µm total thickness) and double-sided (53–54 µm total thickness) configurations utilizing an ultra-thin 10 µm copper core to dramatically boost gravimetric and volumetric energy densities.
- Exceptional Edge Geometry and Slitting Quality: High-precision longitudinal slitting produces slit edges that are clean, straight, and crack-free, preventing localized high-current-density hot spots and mechanical short circuits during cell stacking or winding.
- Hermetic Inert Gas Packaging: Spooled in certified dry-room environments onto rigid reels, sealed in aluminized polyester barrier bags baked for over 24 hours, backfilled with 99.999% ultra-dry argon gas, and housed in heavy-duty outer steel drums for maximum shelf-life stability.
- Versatile Dual-Configuration Architecture: Supplied in single-sided or double-sided cladding variants to support diverse battery architectures, ranging from single-layer pouch testing to double-sided interleaved stacking and winding configurations.
Applications
| Application | Description | Key Benefit |
|---|---|---|
| All-Solid-State Batteries (ASSB) | Utilized as an integrated negative electrode and current collector paired with sulfide, oxide, or polymer solid electrolytes. | Eliminates interfacial voiding, lowers charge-transfer resistance, and simplifies dry-room cell stacking. |
| Lithium Metal Pouch Cells | Integrated into high-energy pouch cells for automotive EV packs, unmanned aerial vehicles (UAV), and aerospace power. | Delivers ultra-high gravimetric energy density while enabling reliable ultrasonic tab welding on bare copper margins. |
| Anode Pre-Lithiation Source | Applied in silicon-dominant and advanced graphite anode systems to replenish active lithium lost during initial SEI formation. | Compensates precisely for first-cycle irreversible capacity loss, drastically enhancing initial coulombic efficiency. |
| Semi-Solid / Gel-Electrolyte Cells | Used in high-safety hybrid electrolyte architectures requiring a stable metallic lithium reservoir and uniform current distribution. | Prevents uneven lithium stripping and plating, significantly reducing dendrite proliferation during high-rate cycling. |
| High-Precision Battery R&D | Implemented in laboratory coin, split, and pouch cell research to evaluate solid-state interfaces, artificial SEIs, and solid electrolytes. | Guarantees high dimensional and chemical repeatability across experimental batches, eliminating manual lithium preparation errors. |
| Cylindrical Lithium Metal Winding | Processed on automated winding machinery for cylindrical cell form factors requiring flexible, non-delaminating metallic composite foils. | High mechanical flexibility and robust Cu-Li adhesion prevent peeling, wrinkling, or cracking along tight winding radii. |
Technical Specifications
| Specification Parameter | Single-Sided Composite Foil (FZ20-S) | Double-Sided Composite Foil (FZ20-D) |
|---|---|---|
| Model Item Number | FZ20-S | FZ20-D |
| Configuration Type | Single-Sided Lithium Clad | Double-Sided Lithium Clad |
| Lithium Foil Thickness | 0.021 mm (21 µm) | 0.021 ~ 0.022 mm (21 ~ 22 µm) per side |
| Copper Substrate Thickness | 0.010 mm (10 µm) | 0.010 mm (10 µm) |
| Total Composite Thickness | 0.031 mm (31 µm) | 0.053 ~ 0.054 mm (53 ~ 54 µm) |
| Lithium Strip Width | 80.09 mm | 80.11 mm |
| Copper Substrate Width | 100.00 mm | 100.00 mm |
| Left Edge Margin (Cu Exposed) | 10.0 ± 1.0 mm | 10.0 ± 1.0 mm |
| Right Edge Margin (Cu Exposed) | 10.0 ± 1.0 mm | 10.0 ± 1.0 mm |
| Lithium Purity (Li Content) | ≥ 99.9% min | ≥ 99.9% min |
| Surface Quality | Bright, metallic finish, free of oxides, nitrides, oil stains, holes, tears, wrinkles, and creases | Bright, metallic finish, free of oxides, nitrides, oil stains, holes, tears, wrinkles, and creases |
| Interfacial Bonding | Complete metallurgical weld; no delamination or foreign inclusions | Complete metallurgical weld; no delamination or foreign inclusions |
| Edge Quality | Neat, slit edges without cracks or burrs | Neat, slit edges without cracks or burrs |
Chemical Composition & Impurity Thresholds
| Element | Content Specification (%) | Element | Content Specification (%) |
|---|---|---|---|
| Lithium (Li) | ≥ 99.9% min | Silicon (Si) | ≤ 0.008% max |
| Sodium (Na) | ≤ 0.020% max | Chlorine (Cl) | ≤ 0.006% max |
| Nitrogen (N) | ≤ 0.020% max | Aluminum (Al) | ≤ 0.005% max |
| Calcium (Ca) | ≤ 0.020% max | Nickel (Ni) | ≤ 0.003% max |
| Magnesium (Mg) | ≤ 0.010% max | Iron (Fe) | ≤ 0.005% max |
| Potassium (K) | ≤ 0.005% max | Copper (Cu) | ≤ 0.004% max |
Packaging, Handling & Storage Guidelines
| Parameter | Specification & Operational Standard |
|---|---|
| Internal Primary Packaging | Spooled on rigid reels inside certified dry-room environment |
| Protective Barrier Bag | Heavy-duty aluminized polyester vacuum bag, pre-baked > 24 hours to eliminate moisture |
| Protective Atmosphere | Hermetically sealed with 99.999% high-purity dry argon purge gas |
| External Packaging | Reinforced UN-rated airtight steel shipping drums |
| Hazard Classification | Class 4.3 Dangerous Goods (Water-Reactive Lithium Metal) |
| Storage Conditions | Clean, dry, well-ventilated, non-corrosive indoor atmosphere; strictly fire- and moisture-proof |
| Handling Restrictions | Do not roll drums on the ground; avoid severe physical impact; outdoor storage strictly prohibited |
Why Choose This Product
- Superior Interfacial Engineering: The proprietary cladding process establishes an intimate atomic bond between the copper substrate and the metallic lithium layer, eliminating microscopic air gaps, lowering interfacial impedance, and preventing delamination during automated winding or calendering.
- Rigorous Chemical Quality Control: With an assay purity of ≥99.9% and ultra-low nitrogen and sodium thresholds, this material protects against parasitic surface side-reactions, preventing localized hot spots and promoting uniform, dendrite-resistant lithium dissolution and deposition.
- Seamless Production Integration: Built-in 10 mm bare copper welding margins eliminate the complex, hazardous step of scraping lithium from the tab-welding area, enabling high-yield ultrasonic welding on existing battery production equipment.
- Industrial Hermetic Protection Protocol: Every roll is vacuum-sealed in pre-baked aluminized barrier packaging under 99.999% dry argon and encased in steel drums, guaranteeing that the foil arrives in pristine condition with zero surface passivation or contamination.
Contact our technical sales team today to request a custom specification quotation, discuss specialized width and thickness requirements, or arrange sample procurement for your battery engineering program.
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