Carbon-Coated Composite Aluminum Foil (C-APF)
The conductivity of the collector directly affects the power density and rate performance of the battery, but the ultra thin metal layer of the composite collector restricts its conductivity, and it is difficult to achieve ultra-high rate charge and discharge. The ultrathin conductive carbon coating on the surface of the conventional composite aluminum foil can reduce the interface resistance between the active substance and the collector, and also increase the binding force, and finally realize the higher rate charge and discharge ability of the composite aluminum foil.
Performance Table of Carbon-coated Composite Aluminum Foil Products
| Item | Standard Value | Standard |
| Model：C-APF-6040 | ||
Coating thickness on single side （ μm） | 1.0±0.5 | ISO 4591:1992 |
Total thickness（μm） | 10.0±1.0 | ISO 4591:1992 |
Tolerance of coating width（mm） | ≤0.5 | GB/T 6673-2001 |
Coating areal density（g/m²） | 0.6±0.2 | ISO 4591:1992 |
Total areal density（g/m²） | 13.7±1.0 | ISO 4591:1992 |
| Tolerance of left and right blank width（mm） | ≤0.5 | GB/T 6673-2001 |
Tensile strength（MPa） | ≥220 | GB/T 1040.1-2006 |
Break Elongation（%） | ≥15 | GB/T 1040.1-2006 |
Surface tension of coating（mN/m） | ≥64 | Dyne Pen |
Adhesion | 3M Tape without Foil Exposure | / |
| Alignment of coating on both sides（mm） | ≤0.5 | GB/T 6673-2001 |
Center alignment of coatings（mm） | ≤1 | GB/T 6673-2001 |
| Resistance to electrolyte immersion at 85℃（ h） | ≥72 | / |
| Resistance to electrolyte wiping（frequency） | ≥200（Non-Exposed Composite aluminum foil ） | / |
Resistance to NMP wiping（frequency） | ≥200（Non-Exposed Composite aluminum foil ） | / |
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Data analysis of carbon-coated composite aluminum foil (C-APF)
Thickness of carbon coating layer: 1μm/1μm (double-sided) Area density deviation:within ±5% Measuring point: 10*10=100.
| Thickness of carbon coating layer: 1μm/1μm (double-sided) Square resistance deviation: within ±5% Measuring point: 10*10=100.
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