Lithium ion Battery Aluminum Foil

Lithium ion battery aluminum foil is a more advantageous material for lithium batteries, 0.01-0.02mm 1060, 1070, 1080, 1235H18 aluminum foil are applied. The aluminum foil for lithium-ion battery can be seen as a new product with technical difficult, only a few of aluminium foil manufacturers can produce it, it is a prove of technology strength. The advantages of  aluminium foil in the application of lithium-ion batteries are:

1, Improve the consistency, greatly reduce the cost of the battery pack, and increase the cycle life of the battery;

2, Reduce polarization, increase rate and gram capacity, and improve battery performance;

3, Reduce the internal resistance of the battery, and significantly reduce the dynamic internal resistance increase during the cycle;

4, Protect the current collector and prevent the current collector from being corroded and oxidized by the electrolyte;

5, Enhance the easy coating properties of active materials and current collectors, improve the qualified rate of pole pieces, and reduce manufacturing costs;

6, Improve the processing performance of lithium iron phosphate and lithium titanate materials;

7, It can replace the high-cost etched aluminium foil or further reduce the thickness of the aluminum foil to reduce the manufacturing cost.

Technical difficulties of lithium ion battery aluminum foil are:

Power battery aluminum foil is a high-precision product among aluminum foil products, and the control accuracy of various quality indicators is higher, which puts forward higher requirements for environmental control, equipment accuracy, process technology, and on-site management of aluminum processing and production. Compared with ordinary aluminum foil products, the main technical difficulties of battery aluminum foil are:

1, The main function of lithium battery is to charge and discharge. The current collector requires pure composition. The impure chemical composition of aluminum will cause the surface film to not be dense and cause pitting corrosion, and even lead to the formation of LiAl alloy due to the damage of the surface film. The higher the purity of the aluminum foil, the more conducive to the charging and discharging process of the battery.

2, For the consideration of electrical conductivity, heat conduction and charging and discharging safety, strictly control the grain size, hydrogen content, metal and non-metal slag inclusions of the billet, and ensure product quality from the billet.

3, The high purity of lithium ion battery aluminum foil brings difficulties to the improvement of mechanical properties (tensile strength, elongation).