Lithium-ion Battery Foil Materials

Aluminum Foil for Li-ion Cell Manufacturing

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The main components of a lithium-ion battery include the electrolyte, the insulating material, and the positive and negative materials

It works by generating an electric current through a chemical reaction in the electrolyte, which flows from the positive electrode to the negative electrode. In the whole battery unit, the mass ratio of positive and negative materials is 3:1 to 4:1, so the performance of positive materials directly affects the performance of lithium ion batteries.

The properties of the battery foil as the positive electrode ensure smooth conductivity, reduce the contact resistance between the positive and negative electrode materials and the collector fluid, and improve the adhesion between the two and reduce the adhesive, resulting in a significant improvement in the overall battery performance.

HDMETALM is the leading supplier of battery foil materials for lithium-ion energy storage technology in the Asia-Pacific region, with the support and cooperation of domestic and international experts and battery manufacturers.

We select the best alloys, roll them with high precision and manufacture them in a clean environment to provide high performance, near zero defect aluminum (cathode) foil materials to lithium-ion battery manufacturers worldwide.

Lithium-ion-Battery-Foil-soft-Package
Aluminum-Foil-for-Li-ion-Battery-Cathodes

Product

Aluminum Foil for Li-ion Battery Cathodes

Technical Specifications

Alloy

AA1070, AA1060,
AA1235,AA1100

Temper

H18

Dimension (mm)

GAUGE

0.009 – 0.02

Width

100 – 1650

Surface

Single-sided light/Double-sided light/Carbon-coated

ID

Φ152.4mm

OD

Φ800mm – 1100mm

ID

Φ76.2mm

OD

Options

Thickness Tolerance

0.010 < a ≤0.020

±5.0%

Width Tolerance

≤1000mm

± 0.5mm

>1000mm

± 1.0mm

Product physical characteristics

Alloy&TemperThickness(mm)Tensile Strength(N/mm²)Elongation(%)Electrical Conductivity(%IACS)Dyne Value
1085 – H180.010 – 0.020≥160≥1.5≥58≥31
1230 – H18≥170≥3.0≥55
3003 – H18≥250≥1.0≥45
8021 – H18≥160≥1.0≥57

Lithium-ion Battery Foil soft Package

High performance flexible packaging material for lithium-ion pouch cells

Technical Specifications

Alloy

1235, 8021, 8079

Temper

O

Dimension (mm)

GAUGE

0.015 – 0.045

Width

500 – 1600

Thickness Tolerance

0.025< a ≤0.045

±5.0%

Width Tolerance

≤1000mm

± 0.5mm

>1000mm

± 1.0mm

Product physical characteristics

Alloy&TemperThickness(mm)Tensile Strength(N/mm²)Elongation(%)
8079 – O0.025 – 0.04580 – 100≥12
8021 – O80 – 100≥12

Aluminum foil for lithium battery soft pack is widely used in consumer electronics and new energy vehicles and energy storage.

The battery soft pack foil protects personal safety, and in the event of a safety hazard the soft pack battery will at most bulge and crack, rather than explode like a steel-cased aluminum-cased battery cell.

Battery-foil-packaging1

Battery foil packaging for
long distances

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Battery Foil Materials-Equipment and technology1
Battery Foil Materials-Equipment and technology2
Battery Foil Materials-Equipment and technology6
Battery Foil Materials-Equipment and technology6
Battery Foil Materials-Equipment and technology5
Battery Foil Materials-Equipment and technology3

Equipment and technology advantages

Thickness & board shape control and checkout advantages

The rolling mill with mass flow has been commissioned with a special plate shape control mode for battery aluminum foil, and the leading technology of online full-length and full-width detection of both thickness difference and plate shape is realized.

Foreign matter control and management advantages

The plant construction adopts the most strict, advanced and high standard cleanliness level in the world. The battery aluminum foil production equipment has perfect foreign matter management design to strictly control foreign matter generation and improve battery safety.

Advantages of surface & hole outflow prevention

We adopt high precision surface inspection instrument and hole inspection instrument that match the strictest standards of battery aluminum foil to achieve full length and width inspection.

Perhaps you would be interested in the following content.

Continuous development of the battery foil technology revolution.

As the energy density of the power battery increases, the aluminum foil as a collector fluid is also becoming thinner and thinner, thus requiring a lower impurity content, less self-discharge, better thickness uniformity, higher surface tension, better bonding performance, thinner thickness, higher strength, higher conductivity, suitable elongation and other requirements, while in order to improve the content of active substances, aluminum foil surface coating technology is also developing rapidly, the following will briefly introduce these new technologies.

  • Coating technology: the use of functional coating on the battery conductive substrate surface treatment is a breakthrough technological innovation, overlaying carbon aluminum foil is a well-dispersed nano conductive graphite and carbon coated particles, uniformly and delicately coated on the aluminum foil.
    It provides excellent static conductivity and collects micro-currents from the active material, which can significantly reduce the contact resistance between the material and the collector, and can improve the adhesion between the two, which can reduce the amount of binder used, thus producing a significant improvement in the overall performance of the battery.

Through the coating technology, the stability of the interface can be significantly improved, enhancing the stability of the lithium-ion battery long cycle, has been applied in batch on some power battery products, in addition to this, there are some safety coating technology has gradually begun to apply.

  • Porous aluminum foil: With the development of technology, porous aluminum foil technology has come into being, which can carry more active materials and allow closer contact between active material particles.

As far as the current technology is concerned, porous aluminum foil has not been applied in large quantities, there are still difficulties in coating, low tensile strength, laminating broken belt, burr more resulting in large self-discharge and so on, further research and solutions are needed, although there are some small soft package data show that can significantly improve energy density, but Lao Li believes that there is still a certain degree of difficulty from industrialization, the need to optimize the pre-process manufacturing process of lithium-ion batteries to match this technology.

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    Why copper foil for Anode and aluminum foil for Cathode of Li-ion battery?

    For lithium-ion batteries, the commonly used positive collector is aluminum foil and the negative collector is copper foil, both of which require a purity of 98% or more in order to ensure the stability of the collector inside the battery. The main requirement for the collector fluid is to reduce the thickness and weight of the collector fluid. From the intuition to reduce the volume and weight of the battery. In addition, the working principle of lithium battery is a chemical device that converts chemical energy into electrical energy, a medium is needed to transfer the chemical energy into electrical energy, which requires a good conductive material.

    copper-foil-for-Anode-and-aluminum-foil-for-Cathode

    Anode (Copper Foil)

    Copper foil has good electrical conductivity, soft texture and cheap price. Among the common materials, metal materials are the best conductive materials, and among the metal materials, those with cheap conductivity and good conductivity are copper and aluminum foil. As the battery is relatively coiled, it needs the pole piece to have a certain flexibility to ensure that the pole piece does not break brittle when coiled and other problems, and among the metal materials, copper and aluminum foil are also soft-textured metals. Considering the cost of battery preparation, copper and aluminum foil are inexpensive and abundant in resources.

    Cathode (Aluminum Foil)

    The positive and negative electrode potentials of lithium batteries determine the use of aluminum foil for the positive electrode and copper foil for the negative electrode. The positive electrode potential is high, and copper foil is easily oxidized at high potential and reacts easily with Li. While the oxidation potential of aluminum is high, the dense oxide film on the surface also has a better protective effect on the internal aluminum. The copper at low potential is also relatively stable, so copper foil is used for the negative electrode and aluminum foil for the positive electrode.

    Lithium iron phosphate-coated aluminum foil.

    The main production process of carbon-coated aluminum foil.

    Brushing——the aluminum foil is continuously and uniformly passed through the brushing carbon coating box filled with nitrogen gas, in the brushing carbon coating box with nitrogen gas airflow carrying aluminum powder particles sprayed onto the surface of the aluminum foil, rubbing the surface of the aluminum foil to bristle and remove the surface aluminum oxide layer, after brushing the aluminum foil using nitrogen gas airflow to remove the surface aluminum powder particles.

    Carbon coating——in which the carbon conductive paste is applied to the surface of the aluminum foil after grossing and blowing clean in a grossing and carbon coating box.

    Heating and drying——the aluminum foil coated with carbon conductive paste is passed into the heating and drying box, and heated clean air is injected into the heating and drying box to dry the carbon conductive paste.

    Lithium iron phosphate-coated aluminum foil

    Carbon coated aluminum foil is a breakthrough technological innovation in the surface treatment of battery conductive substrates using functional coatings.

    Carbon coated aluminum foil/copper foil is a well-dispersed nano conductive graphite and carbon-coated particles, uniformly and delicately coated on aluminum foil/copper foil.

    The carbon-coated aluminum foil provides excellent static conductivity and collects micro-currents from the active material, which can significantly reduce the contact resistance between the positive/negative materials and the current collection, and can improve the adhesion ability between them, which can reduce the amount of binder used, thus producing a significant improvement in the overall performance of the battery.

    Advantages of carbon-coated aluminum foil in lithium battery applications.

    • Inhibiting cell polarization, reducing thermal effects, and improving multiplier performance.
    • Reduced cell internal resistance and significantly reduced dynamic internal resistance increase during cycling.
    • Improving consistency and increasing the cycle life of the cell.
    • Improving the adhesion of the active material to the collector fluid and reducing the cost of pole piece manufacturing.
    • protecting the collector fluid from corrosion by the electrolyte.
    • Improving the processing performance of lithium iron phosphate and lithium titanate materials.

    The difference between carbon coated aluminum foil and bare aluminum foil for lithium battery applications.

    The electrochemical impedance spectra of batteries made of carbon-coated aluminum foil and photo aluminum foil are significantly different.

    The carbon-coated aluminum foil has a significant improvement on the internal resistance of the battery, while the impedance spectrum of batteries made of photo aluminum foil has an additional segment of capacitive resistance arc generated by the double layer capacitance at the gap between the aluminum foil and the active material interface.

    The storage test results show that the use of carbon-coated aluminum foil results in less self-discharge and improved storage performance.

    The multiplier charge/discharge test results show that the constant current charge ratio and the median discharge voltage of the carbon-coated aluminum foil battery are higher during high current charge/discharge, and the battery has less polarization and better power performance. The low-temperature performance of carbon-coated aluminum foil batteries is also more competitive, with a higher initial discharge voltage plateau and higher discharge capacity. The carbon-coated aluminum foil also significantly improves the 1 C cycle and 3 C cycle performance of the battery.

    Meanwhile, it was found that different types of coated carbon layers have different performance enhancement effects on LiFePO4 batteries: coated graphene aluminum foil has better performance enhancement on LiFePO4 batteries under high power conditions than coated carbon black aluminum foil because the graphene sheet layer has better improvement on electrical and thermal conductivity than carbon black coating in the direction along the aluminum foil surface.

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