Chapter 963

Among the many technical problems restricting the lithium sulfur battery technology, the most difficult one is the shuttle effect.

The so-called shuttle effect refers to that in the process of charging and discharging, the polysulfide (li2sx) intermediate produced by the positive electrode will dissolve in the electrolyte, diffuse to the negative electrode through the diaphragm, and finally contact with the lithium metal of the negative electrode directly.

In order to seize the lithium sulfur battery technology and complete the patent layout ahead of Exxon Mobil, it was the land boat of China's new energy industry in the future. In this project, Professor Stanley, the big bull in the field of lithium battery, launched an isolated competition.

At that time, Professor Stanley, with the support of ExxonMobil, also used an extremely shameful means to bribe an assistant of Sarot Research Institute under his name, and stole the cage carbon molecular model he gave professor Sarot to study.

But thanks to this Wulong.

Professor Stanley not only went further and further on the "wrong" road, but also completed the systematic task of "analyzing the carbon nanospheres under the modified PDMS film" for the land boat, helping him to upgrade the material science level to lv4, and indirectly helping him to hit the research bottleneck of a wave of Nobel Prize achievements

I'm ashamed to say that for so many years, Lu Zhou hasn't called this generous old professor on a thank-you call, and he's very sorry.

At this moment, the black powder in the tube in his hand is the cage shaped carbon molecules developed by Professor Stanley, that is, the carbon nanospheres found on the wreck I.

Yang Xu: "this is..."

"A cage like carbon molecule for carrying oxygen molecules, although I prefer to call it a carbon nanospheres."

The test tube was handed over to Yang Xu, and Lu Zhou continued, "don't forget that in addition to the diaphragm between the gas exchange room and the outside world, there is a layer of modified PDMS film on our lithium cathode material, which is mixed into the modified PDMS film when it is formed into a film. When the difference of oxygen concentration between the two sides of the film reaches a certain value, they will act like bees to move oxygen molecules from one side to the other Carry on one side. "

In short, it is to add two insurances to the oxygen nitrogen separation system. The first one is the selective passage of oxygen molecules through the membrane, that is, the mixture of those organic substances listed on the whiteboard by the land boat. Its function is to create a relatively pure oxygen environment with 98% oxygen content for the gas exchange room!

As for the second insurance, it is the modified PDMS film on the lithium anode material itself!

Only when the hollow carbon spheres are added, the modified PDMS film on the surface of lithium anode can transport oxygen molecules from high purity oxygen to the surface of lithium anode material.

“…… We can even control the rate of lithium oxidation by modifying the number of carbon nanospheres on the PDMS film, thus indirectly controlling the performance of the battery. "

Listening to the description of Lu Zhou, Yang Xu's eyes were full of shock.

Does this really work?

Although I would like to ask that, as a researcher, it's a shame to ask such stupid questions when the samples are already in his hands.

Without any hesitation, he took the test tube to the side of an experimental device.

There is a battery mold and a protective gas operation box, which is specially used to assemble and test battery abrasives.

It's easy to test the theory of a land boat without even a complete model of a lithium-air battery.

He only needs to make a lithium metal sheet covered with the modified PDMS material mixed with the carbon nanospheres, and then expose it in a series of environments, such as air and pure oxygen, pure carbon dioxide, pure nitrogen, etc., so as to know whether it has the property of making oxygen permeable and whether it only allows oxygen to penetrate.

After complicated preparation and patient waiting, the results of the experiment finally came out under everyone's expectation.

In the air environment, the reaction of the sample is not obvious, there is a very small amount of oxide on the surface, which can be determined to be lithium oxide!

In a series of environments such as nitrogen, carbon dioxide, etc., the sample did not react at all!

As for the pure oxygen environment

As Lu Zhou said, the surface of lithium anode has changed dramatically!

Looking at Yang Xu, who didn't know what to do and how to express his heart's shock, Lu Zhou smiled and continued in a relaxed tone, "if you observe the whole reaction process under micro conditions, your expression will be more surprised."

Yang Xu swallowed his saliva and said difficultly: "it is This experiment Have you finished it a long time ago? "

Lu Zhou: "I said that I did this experiment as early as I taught in Princeton, but it has not been published."

Of course, there are many differences between the current carbon nanospheres and the original version made by Professor Stanley.

Especially in the details, the position of several large π bonds on the surface of the ship was adjusted by the method of computational chemistry, so that its carrying capacity was more obvious, and the requirement of oxygen purity was slightly reduced.However, there are different ways to prepare the carbon nanospheres.

"It's incredible..."

"It's amazing the nature of this shuttle that transports oxygen molecules in polymer materials!"

Looking at the surprised Yang Xu, Lu Zhou said fondly.

"It's quite amazing. Until now, I've been thinking about the mechanism of this magical transportation process, and even made two sets of theories that can be explained, but I can't find evidence to prove which one is right."

Yang Xu: "you How did it happen? "

On hearing this question, Lu Zhou suddenly felt embarrassed and said with a smile.

"It's a long story. Thanks to the help of an old friend, I solved the most critical problem of cage like carbon molecule synthesis. Then I made a little improvement on the basis of his research and modified several big π bonds."

Of course, the key is wreck one

If we are launching this material, we are afraid that we can only find a kind of hollow carbon sphere which can highly fit the oxygen molecules, and this experiment will be enough for him.

Yang Xu asked, "is the patent OK?"

Lu Zhou immediately replied, "no problem. My old friend was very generous and sold it to me at a very cheap price."

It was a long time ago.

Not long after the lithium sulfur battery came out, the patents in ExxonMobil's hands had become waste paper, let alone the lithium air battery. Even Professor Stanley didn't know that what he had developed was used for the lithium air battery, so Star Technology didn't spend much money to buy the patents.

Of course, when you buy it, it's not in the name of Star Technology and him.

Although it didn't cost much, the operation was a little complicated.

Yang Xu, who didn't know the inside story, said with emotion, "that old friend of yours is really a good man."

Land boat is also a hearty smile.

"Yeah, I think he's a good man, too."

……

The technology of oxygen molecules selectively passing through the membrane has been conquered. With the key carbon nanospheres, the whole technology tree of lithium air battery has been lightened, basically there is no suspense.

After calling Chen Yushan and leaving her to worry about the patent layout, Lu Zhou left the Jinling Institute of higher learning.

In a word, he came in the morning and left in the morning.

It's good to use the computer to do the simulation in the front. It's just a matter of putting the ready-made model on the computer and running it again. Later, it took a lot of time to test the transport of oxygen molecules by carbon nanospheres, especially the production of the lithium metal sheet covered by the modified PDMS film, which was a long time ago.

Sitting in Wang Peng's car, Lu Zhou, who hadn't closed his eyes for more than 30 hours, yawned and was about to squint for a while, but just then, he suddenly received a call from director Li.

As soon as the phone was connected, he didn't even have time to say "hello". The fiery voice came from the opposite side.

"I read your report! Is it true? Are you sure? That carbon base - "suddenly realized that this thing was inconvenient to say on the phone, director Li immediately stopped talking, bit his teeth and changed his way," you wait, I'll come to your home and tell you. "

Yawned, didn't understand what he was talking about, asked a misty head of the boat.

"Come to me where you are now."

"Go to Beijing! Come by plane! "

Lu Zhou: "...?"

Before I knew it, I hung up with a beep.