Scholar’s Advanced Technological System

Lu Zhou replied: “I am coming.”

The system does not stipulate who must do the experiment, just do the experiment and collect the data that needs to be collected. But for the purpose of learning, Lu Zhou still wants to do it himself.

After all, the end of the paper is shallow, and the book is handed to him is a theory, only the implementation of the hand, can be the legendary black technology into a real guy.

Very ceremony changed into a white coat, Lu Zhou took out a little scientist’s momentum, deepen took a deep breath, reached for the sample box containing the experimental materials.

However, his hand has not been touched, and he was taken over by the eye-catching Senior Brother Qian.

“I still come, look at it.”

In spite of it, Senior Brother Qian took over the initiative of the experiment and left Lu Zhou, a face-stricken face, aside.

Looked towards Big Brother Liu, Big Brother Liu holding his arms is helpless shrugged.

“Don’t mind, the old money is like this. The instrument here is like his wife, it is more important than his life… The first time you still watch him do it again.”

Senior Brother Qian didn’t return, and then said: “The experiment is not about mathematics. It is wrong to change a decimal point and change it. The experiment is wrong with a small detail, which may cause the whole experiment to be abolished. Of course, I am even more afraid. You have to abandon the experimental equipment… Show me the experimental flow of your design.”

“Here.” Lu Zhou quickly took out the A4 paper.

The experimental steps required by the system and the experimental data that needs to be collected are written on it.

Senior Brother Qian took a glance at A4 paper, nodded: “The design is quite professional.”

Emmm…

After all is system designed.

Lu Zhou has a subtle expression and does not speak.

……

The flow of the experiment is very simple, starting with the battery and observing the phenomenon.

95.7% graphite was used as the negative electrode material, and the binder was sodium carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR), and the current collector was copper foil. The graphite layer has a thickness of 90 μm, the positive electrode active material uses LiFePO4, and the current collector is aluminum foil.

As for the diaphragm, the XgarX-Layer diaphragm of Celgard 2325 is used, and the thickness is about 3 μm.

To prevent oxidation of the material, everything is done in an argon-filled glove box.

Of course, not only to prevent oxidation of the material, but also to prevent the LiPF6 component in the electrolyte from reacting with water in the air to form hydrofluoric acid.

Hydrofluoric acid is known to anyone who has studied high school chemistry.

And how dangerous this thing is, people who have been in the silicon-based microelectronics lab should be very clear. Which hand is used to wipe a little, this hand basically can’t see anyone.

Judging from the operation process of Senior Brother Qian, it is obviously more professional than Lu Zhou.

Soon, the sample is finished.

To prevent the sample from being destroyed, the side-to-edge assembly is used. Senior Brother Qian completely covered the LiFePO4 material with a membrane in the glove box and carefully left the free ends of the positive and negative electrodes at a distance of 2mm.

This step is critical and is about the safety of the experiment.

The sample was taken out of the glove box, and the Senior Brother Qian closed the valves and put out a long breath.

“Get it done.”

Looking at the sample in the hands of Senior Brother Qian, Lu Zhou asked, “Is this a battery?”

“A simple and unsafe lithium-ion battery,” Senior Brother Qian said in a concise manner.

Lu Zhou was nervous: “Can it explode?”

Senior Brother Qian shook his head: “The explosion will not happen, but improper operation may cause a fire.”

Moreover, it is a fire on a digital microscope.

It’s a trivial matter to burn out the sample, and it’s too much trouble to bake the lens of the digital microscope.

Lu Zhou estimates that this is one of the reasons why Senior Brother Qian is not letting this newbie touch the experiment.

The sample was connected to the BK-6808 rechargeable battery tester and placed on a digital microscope. Senior Brother Qian set several parameters to the computer, and whispered to repeat the steps on the paper: 2min collects an image once, and the data data collection frequency is 1Hz. After the battery is first charged to 400min, it is discharged to the cutoff voltage… OK.”

The rest is a long wait.

Looking at the instrument that has not changed, Lu Zhou couldn’t help but ask: “Do you have to wait for this battery material test for so long?”

For four hundred minutes, it was almost seven hours.

Senior Brother Qian pushed the glasses and said: “Seven hours is the basic operation. Sometimes it takes a few days to see the results. In general, individuals will be on duty in the lab. Basically, I and Liu Bo take turns. do.”

“Yes,” Liu Bo said with a smile. “I brushed a lot of 40 dramas last year, which was brushed when I was on duty in the lab. Would you like me to recommend it to you?”

Lu Zhou: “This is still not needed.”

Even if it is recommended, he probably has no time to look at it.

After all the operations that need to be done, Senior Brother Qian simply taught Lu Zhou some ways to deal with emergencies.

For example, see the sample smoke, smell the wrong smell, how to clean up the damaged sample, how to protect the instrument, and how to protect yourself.

No matter how expensive the instrument is, it is not as important as people.

Of course, this experiment was not so dangerous, so the Senior Brother Qian threw the key into Lu Zhou with confidence.

He and Big Brother Liu have something to do, it is impossible to stay here all the time, and Lu Zhou is also embarrassed to trouble people. After all, doing this experiment has delayed them for quite some time.

Taking out the book of quantum chromodynamics, Lu Zhou sat next to the digital microscope, while comprehending the knowledge of the theoretical Physics, and occasionally licking the situation on the digital microscope.

Later, he found that he didn’t have to be so careful at all. The sample stayed under the microscope for so long, and there seemed to be no change at all.

It can be seen that the skill of the Senior Brother Qian to do the experiment is quite reliable.

Starting from 10:00 in the morning, I stayed in the lab for six o’clock in the evening, during which Lu Zhou called a takeaway and ate lunch.

Finally, the set time is up, the charge and discharge is over, and Lu Zhou waits for 10 minutes to stay open, according to Senior Brother Qian, and then cuts off the power.

Almost after he had finished the finishing work, there was a footstep outside the lab. Big Brother Liu, who had just had dinner at canteen, almost stepped into the lab.

“Get it?” Looking at the sample, Big Brother Liu skillfully operated the computer and clicked the button to print. “Then collect the data.”

The printer rang.

Soon, Lu Zhou got what he wanted.

A set of photographs that record the growth of lithium dendrites at the microscopic level, as well as charts such as the cyclic voltage curves that the system requires to collect, and so on.

While collecting the data, Big Brother Liu said in a chattering tone.

“…Lithium is the most ideal anode material, but it is also the most difficult to serve. When charging, the lithium ion that returns to the negative pole will never change to a flat lithium metal layer as you wish. Like a flower, it will form a beautiful and deadly tree.”

Waiting for the printer to finish printing the chart, Lu Zhou asked casually: “Fatal?”

“Yes, once this kind of dendritic thing is formed, it will continue to grow with constant charging, and will eventually puncture the diaphragm and contact the positive electrode like a fork.”

Having said that, Big Brother Liu paused and said in a joking tone: “Imagine if you use a wire with the positive and negative poles of the battery. Yes, it is a short circuit. The organic electrolyte is Flammable, have you heard of moli company?”

“no, what happened?”

Big Brother Liu shrugged, handed the printed a4 paper to Lu Zhou. “Their products have almost created history, but because of the use of lithium as a negative electrode, a major safety accident has occurred, resulting in the NTT phone being In the end, the company was bankrupt and was acquired. In contrast, Sony was very smart, using graphite as the negative electrode, and the introduction of lithium-ion batteries quickly occupied the market.”

Lu Zhou couldn’t help but ask: “Did they not do a safety test?”

Big Brother Liu sighed: “Yeah, it’s the same for individuals, but things may not be that simple. Maybe they didn’t find any problems at all? Maybe they think they have found the perfect solution? Who knows? Sometimes, Reality is such a magic.”