Upgrade the world from Hongmeng system

Chapter 276

Early the next morning, Da Bin came to Wu Hao's office with his technical achievements and materials, and Gu Fan also accompanied him to receive them.

"Dabin, as far as I know, the single-layer graphene that can be produced in large quantities is all of spinning grade, and it is barely enough for textiles, but there is no technology for large-scale production." Gu Fan first proposed doubt.

"The concept of mass production is very vague... If it is to produce single-layer graphene that can be directly used in industrial production and processing, and the cost can be controlled within the acceptable range of industrial production, there is really no method."

"Although I have vaguely found a way, the experiment has not been completed completely, because the research deadline has passed, and the courtyard hopes that I will give up."

Da Bin is a person engaged in scientific research, his appearance is similar to Lu Ben's, his temper is also the same, and he has a good character. It is because of this that he can become Gu Fan's good brother.

"Can you tell me, what difficulties did you encounter in your research?" Wu Hao believed in the noble person recommended by the system.

Dabin took a sip of coffee, and then said, "It is very difficult to manufacture single-layer graphene by ordinary methods. My tutor once synthesized a graphene film with a diameter of 15 cm in the laboratory, which can be confirmed to be a single layer. However, its flaws are so severe that it does not have the theoretical physical properties."

"Currently, most laboratory test products cannot achieve a perfect structure or a structure with a defect rate lower than a certain fixed allowable value. It is still very difficult to prepare graphene with a perfect structure."

"The surface structure of graphene obtained by the mechanical method is complete, but the size is extremely difficult to control, and large-scale screening and packaging are also very difficult. Mass production with this method is temporarily unfeasible."

"The redox method is the same, but the surface structure is even worse."

"The feasible method is SiC or CVD, especially the CVD growth method, which has the possibility of large-scale and industrial mass production, but its surface quality is n orders of magnitude worse than that of the mechanical method, and the structure is also very unstable."

"There is still a big problem that needs to be solved. Graphene itself is extremely easy to oxidize in the air. Under the current industrial production conditions, it is still a difficult problem to synthesize graphene with low cost, large-scale synthesis, stable quality, and easy storage and transportation. The problem."

"My method was discovered by accident during an experiment. It was improved by introducing other methods based on the mechanical method. In the laboratory, I once made a graphene film with a length and width of 5cm. , the structure is close to perfection!"

"But in the follow-up experiments, I can't repeat the same perfect test product. I know that I must have overlooked something, but the experiment was terminated before it was tested. I hope to continue the research and find the correct preparation. method."

Dabin finished talking about the industry status of single-layer graphene and his own research situation in one breath.

"According to what you said, the super battery promoted in the media is actually because there is no single-layer graphene that can be mass-produced and has a perfect structure, so there is no way to produce it, right." Wu Hao asked for proof.

Dabin thought for a moment and replied: "Yes, there is a lot of hype about graphene supercapacitors in the society, but there is still a certain distance between this and the actual situation."

"The ideal single-layer graphene can have a specific surface area of ​​2700m2/g, high electrical conductivity, and is an excellent electrode material for electric double-layer capacitors."

"The actual mass-produced graphene that can be purchased is 5-10 layers, and the specific surface is only a few hundred grams per square meter; its bulk specific gravity is very small, and the loading capacity in a capacitor of the same volume is much less than that of activated carbon. And the volume specific energy is further reduced, it is better to use super activated carbon."

"The dangling bonds at the edge of the graphene sheet are highly active and very unstable in use. If used as the main energy storage material, the performance of the capacitor will gradually decline. This process is uncontrollable and the cost problem is more prominent."

"In a short period of time, graphene is still difficult to make a breakthrough as an energy storage material. Now it is only used as a conductive additive, and it is mixed in an amount of less than 1% in the electrode."

"In contrast, the high cost of graphene preparation is not a major problem."

Dabin talked about the problems faced by graphene in super batteries. These problems must be solved by preparing single-layer graphene with a perfect structure.

"Oh, so that's how it is!" Wu Hao finally figured out why graphene super batteries have been publicized for many years, but have not been used on a large scale.

"What can mass-produce single-layer graphene with a perfect structure achieve in the field of energy storage?" Wu Hao continued to ask.

"Theoretically speaking, a battery with a new system made of graphene is subversive in performance and is called a "super battery". The battery made of this material has an energy density of more than 600wh/kg, which is the current power lithium battery. It is 5 times that of the battery, and it only takes 8 minutes to charge once, and it can travel 1000 kilometers; the weight of the battery is only one tenth of that of a lithium-ion battery, and the volume will be greatly reduced, reducing the weight of the car using this battery; the service life of the battery is longer It is four times longer than traditional hydrogenation batteries and twice that of lithium batteries; its cost will be 4% lower than that of current lithium batteries."

Dabin said the official data, which is a relatively ideal result, but it is still a big unknown whether it can be realized.

"That is to say, the application of graphene technology is still in its infancy, especially the single-layer graphene material, which can greatly reduce the volume and weight of batteries. The yield rate is low and the production cost is high, which has become an important factor for the industrialization of graphene batteries. The cause." Wu Hao had a basic judgment on the current situation.

"As far as the field of graphene is concerned, my country is at the forefront of the world in R&D and application. Now it is only a matter of mass production of single-layer graphene with a perfect structure, and the entire industry will usher in a round of great development." Dabin said My own expectations, although in the current situation, how illusory this idea seems.

"Can I borrow the laboratory of Xialong University of Science and Technology to do research? The funding will be provided by me." Wu Hao asked.

"It's difficult. There are so many scientific research topics, and the college itself doesn't have enough resources, so it won't be willing to borrow the laboratory for other projects!" Da Bin rejected this possibility.

"Is [-] million enough to set up a laboratory?" Wu Hao was very determined.

"I don't know, a lot of equipment is custom-made, and the price is hard to evaluate." Da Bin was not sure.

"Hmm... By the way, I can ask someone!" Wu Hao suddenly remembered Zhang Li, and immediately dialed his number.

"Mr. Zhang, I would like to ask you one thing. Can you borrow a laboratory that can study graphene for me? The cost is negotiable!" It is the best choice to borrow a laboratory, after all, it is really difficult to get a lot of special equipment.

"We have one in our company. If Mr. Wu needs it, I can ask for it for you."

"Trouble Mr. Zhang!"

There is still a way to solve the problem in the laboratory.

(End of this chapter)