On the 27th, the reporter learned from Tianjin University that the team of Professor Feng Wei of the school prepared single-walled graphene nanoribbons for the first time in the world by cutting single-walled carbon nanotubes with fluorine-containing free radicals. Authorized. This is the first time that Chinese scientists have obtained a single-layer graphene nanoribbon through a one-step method. As a primary battery cathode material, the energy density can be increased by 30% compared with imported products.
Carbon fluoride is the solid cathode material for primary batteries with the highest theoretical energy density in the world. Feng Wei told reporters that Western developed countries have always regarded high-energy fluorinated carbon preparation as the core technology, and strictly prohibited technological output and open communication. "At present, the widely used fluorocarbon materials in China mainly rely on foreign imports, which seriously restricts the scientific research and industrial development of relevant fields in China."
However, due to its own structural constraints, the current international mainstream fluorocarbon materials also have pain points-it is difficult to achieve both "high energy density" and "high power density". In 2008, the Feng Wei team took the lead in proposing the development of a new type of fluorinated carbon material with a unique structure to achieve the "double height" of energy density and power density. After more than ten years of research, the team subverted the existing covalent fluorocarbon structure based on the graphene six-membered ring structure, and was the first in the world to develop a structural fluorocarbon material with both high voltage and high capacity. According to laboratory measurement, the energy density of this new material reaches 2738Wh / kg, which is 30% higher than similar foreign products, reaching the international advanced level. At the same time, it can work stably under the condition of large discharge current. According to estimates, its cost can be significantly reduced compared to imported materials. "This marks that we have broken through decades of technological blockade in developed countries." Feng Wei said.
At present, the team has achieved stable small batch production of new fluorocarbon materials. (Reporter Zhang Gailun correspondent Jiao Defang)
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