What Are the Advantages of the Application of Microporous Foil in Lithium Ion Batteries?

At this stage, the thickness of the conventional copper foil used in the production of lithium-ion batteries is 8μm~12μm (3C digital battery copper foil has used 6~7μm copper foil), and the thickness of the aluminum foil is 12μm~20μm. 15%~20% of the weight of the ion battery, how to further reduce the weight ratio of copper and aluminum foil to increase the specific energy? Therefore, the microporous copper foil and aluminum foil were born under such environmental stimulation!

Existing specifications of microporous aluminum foil (holes are produced by mechanical processing to maintain the original physical properties of the foil, the coating is not broken, and 0 burrs are not leaking):

1. Directly and effectively increase the specific energy of the lithium battery;

For foils of the same specification, microporous foil with a porosity of 17%, the weight is reduced by 17%; with the same areal density, the positive and negative electrode compaction is increased (some materials are filled into the pores).

2. Effectively improve the lithium battery rate performance;

In lithium batteries with conventional foils, the migration of lithium ions diffuses through the two-dimensional direction of the foil to the pole tip. After the foil is perforated, the diffusion path of lithium ions can be transformed into a three-dimensional omnidirectional penetration, and through the contact surface between the positive and negative electrode materials and the foil is increased, which reduces the lithium-ion migration radius and improves the conduction efficiency.

3. Effectively reduce the internal resistance of the lithium battery;

A comparison of the same foil shows that the use of punched copper foil and aluminum foil can effectively reduce the internal resistance by 8%~20%.

The theoretical basis is presumed to be due to the double effect of increasing the contact surface between the conductive foil and the positive and negative electrodes and at the same time reducing the internal resistance of the foil itself.

4. The infiltration efficiency of the lithium battery electrolyte after injection is greatly improved, and 100% ensures the consistency of infiltration.

In the conventional lithium foil battery, the electrolyte diffuses and infiltrates from the longitudinal circumference to the center. After the hole is punched, it diffuses in a three-dimensional manner, completely eliminating the existence or dryness of the central part of some battery pole pieces.

5. The surface adhesion of the foil is improved. Through the material between the pores, the two sides form an "I" shape bite state, and the probability of the pole piece falling off is greatly reduced.

6. Improve the bending softness of the pole piece, which is more suitable for the application of flexible batteries.

The above information is provided by a perforated aluminum foil manufacturer.