On the 27th, the reporter learned from Tianjin University that Professor Feng Wei's team at the school produced single-layer 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 single-layer graphene nanoribbons in a one-step process. As a cathode material for primary batteries, the energy density can be increased by 30% compared to imported products.
Carbon fluoride is the solid-state positive electrode material for galvanic cells with the highest theoretical energy density in the world. Feng Wei told reporters that developed countries in the West have always regarded the preparation of high-energy fluorocarbons as a core technology, and strictly forbid technical output and public communication. "At present, the widely used fluorocarbon materials in China mainly rely on foreign imports, which severely restricts scientific research and industrial development in related fields in China."
However, due to its structural limitations, the current mainstream international fluorocarbon materials also have pain points-it is difficult to achieve both "high energy density" and "high power density". In 2008, Feng Wei's team first proposed the development of a new type of fluorocarbon 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 has overturned the existing covalent fluorocarbon structure based on the graphene six-membered ring structure, and has taken the lead in developing an international structured fluorocarbon material with both high voltage and high capacity. According to the laboratory measurement, the energy density of this new material has reached 2738Wh / kg, which is 30% higher than similar foreign products, and has reached the international leading level. At the same time, it can work stably under the condition of large discharge current. According to estimates, its cost can be greatly reduced compared to imported materials. "This signifies 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.