Chapter 963: Oxygen porter

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Among the many technical problems that restrict the lithium-sulfur battery technology, the most difficult thing to get is the shuttle effect.
The so-called shuttle effect means that during the charge and discharge process, the polysulfide (Li2Sx) intermediate produced by the positive electrode will dissolve in the electrolyte, diffuse through the separator to the negative electrode, and finally come into direct contact with the lithium metal of the negative electrode.
At first, in order to capture the lithium-sulfur battery technology first, the patent layout in front of ExxonMobil was completed. It was regarded as the land boat that shouldered the future of Huaguo's new energy industry. In this project, it was launched with Professor Stanley, the great bull in the field of lithium batteries An air race.
At the time, Professor Stanley, with the support of Exxon Mobil, also used an extremely disgraceful method to buy an assistant at the Salot Institute in his name and stole him to Salo. Professor Te specializes in cage carbon molecular models.
But thanks to this oolong.
Professor Stanley not only went further and further on the "wrong" road, but also completed the system task of "analyzing the carbon nanospheres under the modified PDMS film" for Lu Zhou, helping him to upgrade the material science level to LV4 , Which also indirectly helped him to impact the research bottleneck of a Bono prize ...
Ashamed to say, for so many years, Lu Zhou didn't call the generous old professor with a phone call of thanks.
At this moment, the black powder contained in the test tube pinched in his hand was the cage-shaped carbon molecule researched by Professor Stanley, that is, the carbon nanospheres found on Wreckage 1.
Yang Xu: "This is ..."
"A cage-like carbon molecule used to carry oxygen molecules, although I prefer to call it carbon nanospheres."
Handing the test tube into Yang Xu's hands, Lu Zhou continued, "Don't forget that in addition to the diaphragm of the gas exchange chamber and the outside world, our lithium anode material also has a layer of modified PDMS film. PDMS films are mixed during film formation. When the oxygen molecule concentration difference on both sides of the film reaches a certain value, they move oxygen molecules from one side to the other like a bee. "
In short, it is to add two insurances to the oxygen-nitrogen separation system. The first insurance is that the oxygen molecules selectively pass through the membrane, that is, the mixture of organic substances listed on the white board by the boat, which is used to create a gas exchange chamber. Relatively pure oxygen environment with an oxygen content of up to 98%!
As for the second insurance, it is the modified PDMS film on the lithium anode material itself!
Only after the hollow carbon spheres are added, the modified PDMS film on the surface of the lithium anode will transfer oxygen molecules from the high-purity oxygen to the surface of the lithium anode material.
"... We can even control the performance of the battery by indirectly controlling the rate of the lithium oxidation reaction by modifying the number of carbon nanospheres on the PDMS film."
Listening to the description of the landing boat, Yang Xu's eyes were filled with shocking expression.
Does this thing really work?
Although I really want to ask this question, as a researcher, it is a shame to ask such stupid questions when the samples are already in his hands.
Without any hesitation, he took the test tube next to an experimental device.
There are battery molds, and a protective gas operation box, which is used to assemble and test battery grinding tools.
It is easy to test Lu Zhou's theory without even needing a complete lithium air battery model.
He only needs to make a lithium metal sheet covered with a modified PDMS material mixed with such carbon nanospheres, and then expose it to air and pure oxygen, pure carbon dioxide, pure nitrogen and a series of environments. It is easy to know whether it has the property of allowing oxygen to pass through, and whether it allows only oxygen to pass through.
After complicated preparations and patient waiting, the experimental results finally came out of everyone's expectations.
In the air environment, the reaction of the sample is not obvious, and 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 pure oxygen ...
As Lu Zhou said, the entire lithium anode surface has undergone amazing changes!
Looking at Yang Xu, who had no idea what to do or look on his face, to express the shock in his heart, Lu Zhou smiled and continued easily, "If you observe the entire reaction process under micro conditions, your expression Would be even more surprised. "
Yang Xu swallowed and said hardly: "... this experiment ... you completed it a long time ago?"
Lu Zhou: "I said, I did this experiment long ago when I was teaching at Princeton, but it has never been published."
Of course, this carbon nanosphere is still quite different from the original version made by Professor Stanley.
Especially in the details, Lu Zhou adjusted the positions of several large π bonds on the surface through computational chemistry to make its handling capacity more obvious, and the requirements for oxygen purity were slightly reduced.
However, the methods of preparing such carbon nanospheres are all the same way.
"It's incredible ..."
"The nature of this shuttle to carry oxygen molecules in polymer materials is really amazing!"
Looking at Yang Xu with a look of surprise, Lu Zhou said with nostalgia.
"It's amazing. Until now I've been thinking about the cause of this magical handling process, and even made two sets of explanations, but I can't find evidence to prove which one is right."
Yang Xu: "How did you ...?"
When hearing this question, Lu Zhou's expression suddenly felt a little embarrassed, and he laughed and said.
"That's a long story. In short, thanks to the help of an old friend, the most critical problem of this kind of cage carbon molecule synthesis was solved, and then I made a little improvement and modification based on his research. Several large π bonds. "
Of course, the most critical thing is Wreck One ...
If this material is being introduced, I am afraid that just by finding a hollow carbon sphere that can highly match the oxygen molecules, this experiment will be enough for him to do.
Yang Xu asked: "Is there any problem with the patent?"
Lu Zhou immediately replied: "No problem, this old friend of mine sold me very generously and very cheaply."
This is a long time ago.
Not long after the lithium-sulfur battery came out, those patents in ExxonMobil's hands had become waste paper. Not to mention the lithium-air battery has no shadow, even if Professor Stanley himself didn't know what he had developed was Lithium-air battery, so Starry Technology bought the patent without much cost.
Of course, when you buy it, it is not in the name of Starry Sky Technology and him.
Although it didn't cost much, the operation was a bit complicated ~ EbookFREE.me ~ Yang Xu, who did not know the inside, said with a emotion: "Your old friend is really a good person."
Lu Zhou also smiled heartily.
"Yeah, I also think he is a good guy."
...
The technology of selective permeation of oxygen molecules through the membrane has been overcome. Coupled with the key carbon nanospheres, the lighting of the technological tree of the entire lithium-air battery has basically no suspense.
After making a phone call to Chen Yushan, and leaving the matter of patent layout to her to worry about, Lu Zhou left the Jinling Advanced Institute.
Speaking of which, he came in the morning, but left when he left.
It was okay to use a computer to do the simulation, just put the ready-made model on the computer and run it again. It took a lot of time to check the carbon nanospheres' handling of oxygen molecules later, especially the lithium metal sheet coated with the modified PDMS film, which took a long time to toss.
Sitting in Wang Peng's car, Lu Zhou, who hadn't closed his eyes for more than 30 hours, yawned and was about to take a nap, but at this moment, he suddenly received a call from Director Li.
As soon as the phone was connected, he didn't even have time to say "Hello", and the voice of urgency came from the opposite side.
"I've read your report! Is it true? Are you sure? That carbon-based—" Suddenly realized that this thing is not convenient to say on the phone, Director Li immediately stopped talking and bit his teeth. Dictated, "You wait, I come to your house and tell you."
He yawned, and didn't understand what he was talking about, and asked in confusion.
"Come where you are now."
"Go to Beijing! Come by plane!"
Lu Zhou: "...?"
Before responding, the phone hung up.