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According to Taiwan’s “Central News Agency†report, mobile phones and other 3C electronic products are in the spotlight, and the industry is pursuing smaller, higher-capacity batteries. Team Tsinghua University in Taiwan researches and develops red phosphorus materials, which helps to increase the charge capacity of lithium batteries and make them smaller. Lighter, lighter, better battery life.
Professor Duan Xingyu, a professor of chemical engineering at Tsinghua University in Taiwan, developed a new battery material called "red phosphorus-doped iodine nanoparticles." It also used it to make the world's first full-red battery with red phosphor as a negative electrode, that is, a practical battery. The results were published in international journals, and the most popular science magazine in the US chemical industry also reported articles.
Duan Xingyu said that lithium-ion batteries are widely used in 3C products, but the amount of energy that can be used on a single charge has not been able to increase. The key is that the capacity of graphite materials used in negative electrodes has reached the limit. In the past, some scholars had thought that the theoretical capacity of graphite would be 7 times that of graphite. Phosphorus is used as an alternative, but although phosphorus can store high electricity, it is almost non-conductive. Even if it is not easy to charge the electricity, as long as it is charged and discharged several times, the phosphorus material will be broken due to rapid expansion.
The team took more than one year. After experimenting with hundreds of materials, the solution synthesis method was finally developed. Using phosphorus triiodide as the raw material, it was possible to synthesize "red phosphorus-doped iodine nanoparticles" at room temperature in as little as 5 minutes. The electrical conductivity instantly increases to 10 billion times that of red phosphorus, and this new material remains stable after several hundred charge-discharge cycles.
The first author of the paper, Zhang Weizhong, a doctoral student of Qing Da University of China, revealed that the key to success lies in “reverse thinkingâ€. In the past, researchers tried to synthesize nanophosphides and used high temperatures to release the precursor of phosphorus. He tried it in an accidental experiment. The low-boiling precursor “Piotriiodinated Phosphor†produced unexpected results. Therefore, the experiment was redesigned to produce iodine-doped red phosphorus nanoparticles at room temperature. This is also the world’s first synthesis of red phosphorous nanoparticles at room temperature. material.
Duan Xingyu said that phosphorus is one of the most abundant elements on the earth's surface. It is cheap and easy to obtain, making the potential of new materials infinite. If iodine-doped red phosphorus nanoparticles are used, new smaller, lighter, and better endurance can be achieved. Material battery, the current team has begun to apply for a patent, in the future will try to apply iodine-doped red phosphorus nanoparticles on sodium-ion batteries, hope to reduce the cost of large-scale energy storage grid and increase the available capacity, to bring new generation of battery R & D Revolutionary breakthrough.
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