Power battery companies have launched a battle to overcome high energy density, and the introduction of new lithium battery materials is the first choice for current battery companies. As a lithium battery auxiliary material, Conductive paste for electronics is also transforming from traditional materials such as carbon black to new materials such as carbon nanotubes. Specifically, in the digital and power markets, lithium battery companies will have some differences in the selection of carbon nanotube conductive agents. At present, except for the low-end lithium battery market that still uses traditional carbon black, more than 90% of mid-to-high-end digital lithium battery companies are using carbon nanotubes, such as digital giants such as BYD, BAK, Lishen, and Zhuoneng.
In terms of power batteries, the material systems of various battery companies are different, and they will be matched separately according to the different forms, particle sizes, specific surface areas, and conductive properties of Conductive paste for electronics. For example, ternary and manganese materials prefer pure carbon nanotubes, mainly multi-walled carbon nanotubes; lithium iron phosphate systems prefer composite carbon nanotubes (mostly doped with graphene).
The demand for power batteries has exploded rapidly, and battery companies have also increased their performance requirements for carbon nanotubes. Domestic carbon nanotube companies that have secured a position in technology in advance have gained a first-mover advantage.
From a technical point of view, conductive paste for electronics can improve the conductivity of lithium batteries, but the more it is added, the better. According to the test results, when the content of conductive carbon black increases to 3%, the first charge and discharge efficiency of lithium batteries reaches the highest; when it increases to 4% and 5%, the first charge and discharge efficiency is reduced.
Generally speaking, the amount of conductive agent added is 1%-3% of the weight of the positive or negative electrode. The amount of carbon black added to the positive electrode material is usually about 3%, while the amount of new conductive agents such as carbon nanotubes and graphene can be reduced to about 0.5%~1%, which increases the filling amount of positive electrode active materials and helps to improve the energy density of lithium-ion batteries.
Compared with traditional carbon black, the addition of carbon nanotubes is about 0.5%-1.5%, which can achieve the effect of enhancing conductivity, reducing the amount of carbon black by nearly half. The small amount added but the better effect is the main reason why power battery companies are gradually replacing traditional conductive agents.
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