Overview
Battery foil is a precision-engineered aluminum or copper foil used as a current collector in lithium-ion batteries and supercapacitors. It accounts for approximately 2-3% of a battery's total weight but is critical for electron transfer between electrodes and terminals. Developed in the 1990s alongside lithium-ion battery technology, modern battery foils undergo specialized rolling and annealing processes to achieve thicknesses between 8-20µm. Leading producers are concentrated in Asia, with China accounting for over 60% of global production capacity.
Physical and Chemical Properties
Aluminum battery foil typically contains 99.6-99.9% pure aluminum with trace elements like iron and silicon to enhance strength. Key metrics include surface roughness (Ra <0.2µm) and tensile strength (150-200 MPa). The material demonstrates excellent electrical conductivity (35-38 MS/m) and thermal stability up to 150°C. Unlike standard aluminum foil, battery-grade versions undergo electrochemical etching to create micro-pores for better electrode adhesion while maintaining corrosion resistance to organic electrolytes.
Main Applications
Primary use is in lithium-ion batteries for electric vehicles (EVs), where it serves as the cathode current collector in NMC, LFP, and LCO battery types. Thinner foils (8-12µm) are preferred for high-energy-density EV batteries. Secondary applications include supercapacitors for energy storage systems and flexible printed circuits. Emerging uses involve sodium-ion batteries and solid-state battery prototypes, where copper-aluminum composite foils show promise for higher voltage applications.
Safety and Storage
While non-flammable, battery foil requires dry storage (relative humidity <60%) to prevent oxidation that could impair conductivity. Industrial rolls should be stored vertically to prevent deformation. Workers handling foil slitting equipment require cut-resistant gloves due to sharp edges. Recycling follows standard aluminum recovery processes, with energy consumption about 5% of primary production. Contaminated foils (with electrode materials) require specialized separation before recycling.
B2B Procurement Guide
Technical specifications should include: thickness tolerance (±1-2µm), width (commonly 500-1,500mm), and core diameter (76mm or 152mm). MOQs typically start at 1 metric ton for standard grades. Quality certifications to verify: ISO 9001, IATF 16949 for automotive applications. For EV batteries, request foil with <0.5% thickness variation across rolls. Leading manufacturers include UACJ (Japan), LOTTE Aluminum (Korea), and Ding Sheng New Materials (China). Spot prices fluctuate with aluminum ingot costs plus $2,000-3,000/ton processing fees.
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