| Customization: | Available |
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| Type: | Li-ion Battery |
| Cathode Material: | NCM |
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Showa Denko's CNT has the following advantages: |
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Cost aspect |
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Based on large-scale advanced equipment, Showa Denko produces high-quality CNTs in large quantities, and can supply them at a reduced price if they are in large demand. |
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Accumulation of technical knowledge and insights |
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Showa Denko has been developing the VGCF series since 1982 and is a pioneer in this field. |
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Product name |
Fiber diameter |
Fiber length |
Aspect ratio |
Bulk density |
Thermal conductivity |
Conductivity |
Features |
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VGCF-H |
150nm |
6um |
40 |
0.08g/cm3 |
1200W/(m.k) |
1.0E-0.4Ω.cm |
High thermal conductivity, |
Why VGCF carbon tubes added to the positive and negative active materials of Li-ion batteries?
1. Regardless of the positive or negative active material, there will be expansion and contraction problems. Generally, the negative electrode carbon material has a 20% expansion and contraction rate, while the positive electrode material like LFP has a 6% expansion yield. During multiple charging and discharging, the positive and negative active material particles have little contact with the particles, the gap is enlarged, and some are even separated from the collector, resulting in intermittent and discontinuous phases in the electron and ion transmission path, which becomes a dead active material. Participate in the electrode reaction again. Therefore, the cycle life is reduced. The VGCF carbon tube has a large aspect ratio. Even after the positive and negative active materials expand and contract, the gap between the active material particles can be bridged by the VGCF carbon tube, and the transmission of electrons and ions will not be interrupted.
2. Because the microstructure of the VGCF carbon tube is a hollow multi-tube wall, the positive and negative electrodes can absorb more electrolyte, so that lithium ions can be inserted or extracted smoothly and quickly. Therefore, it is conducive to high-rate charge and discharge.
3. VGCF is a high-strength fibrous material with a large aspect ratio, which can increase the flexibility of the electrode plate, and the adhesion between the positive or negative active material particles or the adhesion between the electrode plates is stronger, and it will not be deflected And cracking off the powder.
4. The nature of VGCF is high electrical conductivity and thermal conductivity. The positive electrode active material has poor electrical conductivity. Adding VGCF can improve the electrical conductivity of the positive electrode active material, and also increase the thermal conductivity of the positive electrode or the negative electrode, which is good for heat dissipation.
VGCF series products are mainly used in lithium batteries, especially power lithium-ion batteries;
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