In recent years, the application of Battery-grade silicon-carbon negative electrode in the field of power batteries has been increasingly strengthened, and the annual output has exceeded the thousand-ton level, and it is expected to gradually move towards the ten-thousand-ton scale. Although the application adaptability of Battery-grade silicon-carbon negative electrode in square battery structure is relatively low, and the use ratio is less than 5%, its application rate has been significantly improved in the design of large cylindrical batteries, reaching more than 4%. At the same time, in the consumer electronics market, especially in power tools and smart wearable devices, the application ratio of silicon-based materials is also steadily increasing.
An important issue in the practical application of Battery-grade silicon-carbon negative electrode is its impact on the thickness of the negative electrode sheet, which may lead to a decrease in the yield during the winding process, especially in the production of large cylindrical batteries, compared with pure graphite materials, the yield has declined. At present, the actual participation ratio of silicon-carbon is roughly concentrated in the range of 3%-7%. With the maturity and stability of the processing technology, it is expected to increase to 10% in the future. It is expected that the release of new production capacity will be more obvious in the next two years. However, when the silicon-carbon content exceeds 3%, a balance must be struck between cycle efficiency and safety, so mainstream battery manufacturers mostly keep it at around 3%, striving to ensure battery safety performance while improving energy density.
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