Mainly used in the manufacture of cell phones and laptop computers and other portable electronic devices for lithium-ion batteries as cathode materials.
Lithium-ion batteries as cathode materials:Advantages of carbon coated aluminum foil in lithium battery applications
1. Suppressing cell polarization, reducing thermal effects, and improving multiplication performance;
2. Reducing the internal resistance of the battery, and significantly reducing the increase in the dynamic internal resistance of the cycling process;
3. Improving the consistency, and increasing the cycle life of the battery;
4. Improve the adhesion between the active substance and the collector, and reduce the manufacturing cost of the pole piece;
5. Protect the collector from corrosion by the electrolyte;
6. Improve the processing performance of lithium iron phosphate and lithium titanate materials.
Conductive Coating
The use of functional coatings for surface treatment of battery conductive substrates is a breakthrough technological innovation. Carbon coated aluminum foil/copper foil is a well-dispersed nano conductive graphite and carbon cladding particles that are uniformly and finely coated on aluminum foil/copper foil. It can provide excellent static electrical conductivity and collect microcurrent from the active material, which can significantly reduce the contact resistance between the positive/negative electrode material and the current collector, and can improve the adhesion ability between the two, which can reduce the amount of binder used, and thus produce a significant improvement in the overall performance of the battery.
There are two types of coatings: water-based (aqueous system) and oil-based (organic solvent system).
Performance Advantages of Carbon Coated Aluminum/Copper Foil Significantly improves the consistency of the battery pack and significantly reduces the cost of the battery pack. For example:
- Significantly reduce the increase of dynamic internal resistance of battery cells; - Improve the consistency of differential pressure of battery packs; - Extend the life of battery packs; - Significantly reduce the cost of battery packs.
2. Improve the bonding adhesion of active material and collector, reduce the manufacturing cost of pole piece. Such as:
-Improve the adhesion of cathode material and collector using aqueous system; -Improve the adhesion of nano or submicron grade cathode material and collector; -Improve the adhesion of lithium titanate or other high-capacity anode material and collector; -Improve the qualified rate of the pole piece making and reduce the cost of the pole piece manufacturing.
Adhesion test chart of battery electrode with carbon coated aluminum foil and light foil
After using carbon coated aluminum foil, the adhesion of the electrode is increased from 10gf to 60gf (using 3M tape or Baguette knife method), which is a significant improvement in adhesion.
3. Reduce polarization, increase multiplicity and gram capacity, improve battery performance. Such as:
- Partially reduce the proportion of adhesive in the active material to improve the gram capacity; - Improve the electrical contact between the active material and the collector; - Reduce the polarization to improve the power performance.
Battery multiplication performance chart of different aluminum foils
Where C-AL is carbon coated aluminum foil, E-AL is etched aluminum foil, and U-AL is photo aluminum foil
4. Protecting the collector and prolonging the service life of the battery. Such as:
- Prevent the collector from corrosion and oxidation; - Improve the surface tension of the collector and enhance the easy coating performance of the collector; - Can replace the higher cost etched foil or replace the original standard foil with thinner foil.
Battery cycling curves of different aluminum foils (200 weeks)
Where (1) is light aluminum foil, (2) is etched aluminum foil, and (3) is carbon-coated aluminum foil