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A technology that can dramatically increase battery capacity has been developed. The protagonist is Dr. Lee Geon-woong of the Korea Electrotechnology Research Institute. In lithium-ion batteries that charge and discharge by going back and forth between the positive and negative poles, the cathode material that generates electricity is an important factor that determines the performance of the battery. Graphite used in existing batteries had a fatal flaw of a short lifespan. Accordingly, domestic and foreign companies began to take interest in silicon, which can increase capacity and lifespan more than graphite. However, due to the characteristic of silicon that swells every time it is charged, the maximum capacity with current technology was to insert only 5% of silicon capacity. This is because the more silicon capacity was inserted, the more severely it swelled. Dr. Lee Geon-woong's team found a way to overcome this flaw: wrapping graphene in silicon! Graphene, a honeycomb-shaped carbon nanomaterial, is strong and flexible, which can prevent silicon from expanding. In addition, they developed a source technology that allows graphene to mix well with water, creating an even more solid coating. With this technology, it is said that silicon capacity could be increased by 20%... #Graphene #New material #Fusion #New technology #Technology development #Graphene-related stocks #Applied chemistry #New and renewable energy #Silicon cathode material #Electric vehicle #Graphite #China #Battery #Science [Copyright (c) YTN science Unauthorized reproduction, redistribution, and use of AI data prohibited]