I am devoted to scientific research, but you want to trick me into having a love relationship?

Chapter 504 Let Song Yao try something else
The feeling of talking about it on paper and actually doing it is completely different.

To put it in a more vivid way, holding a Michelin three-star recipe, the grams of salt are accurate to two decimal places, and the heat is broken down into thermodynamic formulas. You believe that as long as you strictly follow the steps of "β-carotene undergoes Maillard reaction at 180°C", you can replicate the perfect red wine braised beef in the photo.

But during the experiment, you found that the stove's fire was unstable, the spatula was rusty, and there were only expired curry cubes left in the refrigerator.

Even if there are no problems with these, there may still be slight differences between the finished product and the theory due to differences in firepower, cooking timing, etc.

Otherwise, why do they say that what you learn from books is always superficial.

In the laboratory, Xu Qingzhou was checking the equipment when he suddenly felt a chill on his back. He looked up but found nothing unusual. He was more surprised that Song Yao and Sun Simin were chatting in the office.

"Illusion."

Xu Qingzhou shook his head, checked the equipment, and started to operate. Except for the last time in Professor Zhao Shengwen's experimental group, this was his second time to make a battery.

First, cut the lithium foil with stainless steel scissors in a glove box.

Then, gently wipe the surface with a dust-free cloth dipped in DMC (dimethyl carbonate) to remove the oxide layer and impurities, and immediately transfer it to a glass bottle and store it in argon gas.

Although it was only the second time I did it, the whole process went smoothly.

This is like an ascended master who practices an unfamiliar technique. Although he has just started practicing, his own experience in practice is all there.

After a long time, Xu Qingzhou carefully fixed the cut lithium foil on the ALD sample table, started the ALD program, and deposited 20 cycles of AlO.

20 minutes passed.

"Well, it's finally the critical moment."

Xu Qingzhou took out the sample, concentrated his attention, and used tweezers to place the components one by one, from the negative electrode shell to the negative electrode, and then to the diaphragm soaked in electrolyte.
Finally, put the positive electrode shell in, ensure that the centers of each layer are aligned with a deviation of <0.5 mm, and drip the electrolyte onto the surface of the diaphragm.

Soon, a simple sample was completed.

After taking the sample out of the glove box, putting it into the material box, closing the gas valve, and checking all the equipment again, Xu Qingzhou breathed a sigh of relief.

"It's done."

He put it in a box and took it out of the lab.

"All right?"

Song Yao was looking through the battery paper that Xu Qingzhou had placed on the table.

Xu Qingzhou nodded and placed the sample in front of Song Yao.

Song Yao looked at the sloppy battery samples in the box and commented, "It's a bit ugly."

"Vulgar. How can you judge a book by its cover? It's a little ugly, but it has all the functions it should have."

Xu Qingzhou defended the reputation of his sample.

Sun Simin came over and asked, "It won't explode, will it?"

"Not really."

Xu Qingzhou put the sample away and said, "Okay, put it aside for now and test it tomorrow."

This thing has to be sent to a shared laboratory for testing, where there are electrochemical workstations, BTS-4000 constant current charge and discharge testers and other equipment that can perform basic electrochemical performance tests.

A round of testing takes at least 12 hours.

Unfortunately, he only had an appointment for the equipment until next Monday.

"gone."

"Goodbye, Professor. Goodbye, Song scholar."

The two of them said hello to Sun Simin and walked out of the laboratory.

At 11 o'clock in the morning, the sun came out and a few white clouds dotted the blue sky.

The sun is shining brightly and the breeze is not dry, making people feel relaxed.

"Did you two have a good chat while I was doing the experiment? What did you talk about?"

"She said we were her idols. We chatted about it, like how you tricked me into it."

"."

It's obvious that someone is taking advantage of the situation!

Winter in foreign countries has always been a mystery. Even in the coldest months of the year, some people expose their thighs, not to mention that we are now in the transition period from late autumn to early winter.

Look, there are two girls in the distance who are dressed quite refreshingly, wearing black short skirts and high heels.

“Professor Xu” “Hmm?”

Song Yao came close to Xu Qingzhou and asked in a low voice: "Do you like this kind of stockings?"

"do not like."

Xu Qingzhou answered decisively and would not fall for such a low-level trick of Song Yao, but to be honest, high heels with black stockings are indeed very attractive, so he will find time to let the girl next to him try it.

Song Yao didn't know Xu Qingzhou was plotting against her yet, so she sneered, "Hypocrisy."

"I like stockings because I like legs, but I don't like her legs, so of course I don't like the stockings she wears."

Xu Qingzhou spoke with reason and evidence. He paused and said, "If you are willing to wear it when you go home, I will definitely like it."

"It's a beautiful thought."

Thinking of Xu Qingzhou's various perverted behaviors when wearing stockings, Song Yao couldn't help but curl her toes.

The two threw their things into the car and found a western restaurant on Massachusetts Avenue. After dinner, they didn't rush home, but planned to walk around the area and go see a movie.

On Monday, Xu Qingzhou went to the laboratory first, told Carson the parameters that needed to be adjusted, and prepared to take the samples to the laboratory.

"Everyone says I have a gambler's mentality and act recklessly."

Carson looked at the battery made by Xu Qingzhou and couldn't help but sigh: "But I dare say that you are the most willful researcher I have ever seen."

"Used to it."

Xu Qingzhou smiled faintly and turned to walk out, thinking to himself that if I hadn't been cheating, I would have won at the starting line long ago, and I wouldn't have dared to do this.

"."

Carson had a complicated expression and could only sigh that his boss was too perverted.

He took a deep breath and prepared to make new samples according to Xu Qingzhou's arrangements.

On the other side, Xu Qingzhou quickly arrived at the laboratory in Building 13 of the Department of Materials.

Here, the reversibility and reaction kinetics of lithium deposition/stripping can be analyzed, and capacity decay and cycle life can be evaluated.

At the same time, the Cryo-SEM can also record the growth process of lithium dendrites and provide real-time dynamic monitoring of the lithium deposition process.

He wasted no time, stuffing the battery into the device and first performing a cyclic voltammetry (CV) test, performing a 3-hour high-precision scan.

After making sure the instrument is operating normally, the next step is a long wait.

He sat down and looked up the battery information.

Starting from around 9 o'clock in the morning, Xu Qingzhou stayed in the laboratory until 8 o'clock in the evening. During this period, Sun Simin came twice and brought a fat house happy meal and pasta.

In the laboratory, the printer was humming, and sheets of drawings recording battery data were spit out.

"After 500 cycles, the capacity is 90.3 mAh/g, which decays rapidly, and the capacity retention rate is 40.2%, which is a bit miserable."

Xu Qingzhou smiled bitterly and glanced at the second data chart. "The only thing that is gratifying is that the oxidation/reduction peak current ratio (I/I) = 1.07, indicating that the ALD coating significantly improves the reversibility of lithium deposition or stripping."

This proves that adding ALD coating is still useful.

Next, of course, is the lithium dendrite problem that he is most concerned about.

Xu Qingzhou picked up the scan of the lithium dendrites.

【Needle-shaped dendrites, length>50μm, density 12.3/μm】

Lithium dendrites are like wildly growing thorns, sharp and disorderly, and may pierce the battery separator at any time.

The result was not very good, a little worse than he expected.

"At least I took the first step."

Xu Qingzhou rubbed his sore temples, downloaded the data to the hard drive, and went home with a thick stack of data charts.

Song Yao is going on a business trip on the 20th.

Have to go back early.

First, see what work arrangements Song Yao has.

The essence of high-frequency trading is the combination of mathematics and algorithms, which is quite troublesome to do.

It took Song Yao two weeks to sort out the statistical arbitrage and pricing model and his previous work content. Next, he should move on to liquidity hunting and game model.
The second point is that since I have work to do, I naturally have to seize the time and ask for advice from Teacher Song before he goes on a business trip.

(End of this chapter)