Lu Zhou replied, "I'll do it."
The system did not specify who had to operate the experiment. He just had to do the experiment once and collect the data that needed to be collected. However, for the sake of learning, Lu Zhou still wanted to do it himself.
After all, what was learned on paper was ultimately shallow. The books were all theories. Only by putting them into practice could he turn the legendary black technology into a real thing.
Lu Zhou put on his white coat and looked like a scientist. He took a deep breath and reached for the sample box containing the experiment materials.
However, before his hand could touch it, it was snatched away by Senior Brother Qian who had sharp eyes and nimble hands.
"Let me do it, I'll watch."
Without saying anything, Brother Qian took over the initiative of the experiment and left the muddled Lu Zhou on the side.
He looked at Brother Liu, who shrugged helplessly with his arms crossed.
"Don't mind him, Old Qian is like this. The equipment here is like his wife, more important than his life … You should watch him do it for the first time."
Brother Qian did not look back as he said, "Doing an experiment is not doing mathematics. If you make a mistake, you can just correct it. If you make a small mistake, the entire experiment will be useless. Of course, I'm more afraid that you'll destroy the experimental equipment … Show me the experimental process you designed. "
"Here it is." Lu Zhou quickly took out the A4 paper.
He had written down the steps of the experiment required by the system and the experimental data that needed to be collected.
Brother Qian took the A4 paper, glanced at it, and nodded. "The design is quite professional."
Emm …
After all, it was designed by the system.
Lu Zhou had a subtle expression and did not speak.
…
The experimental process was very simple. It started with making the battery and observed the phenomenon.
95.7% graphite was used as the negative electrode material. The binder was sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR). The collector was copper foil. The graphite layer was 90μm thick. LiFePO4 was used as the positive electrode active material, and the collector was aluminum foil.
As for the diaphragm, it was a Celgard 2325 three-layer diaphragm with a thickness of about 25μm.
In order to prevent the material from oxidizing, all operations were carried out in the glove box filled with argon.
Of course, it was not only to prevent the 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.
Everyone who studied high school chemistry knew about hydrofluoric acid.
Anyone who had worked in a silicon-based microelectronics laboratory should know how dangerous this thing was. Whichever hand was smeared with a little, that hand would basically be unable to show its face.
From Senior Brother Qian's operation process, it was obvious that he was much more professional than Lu Zhou, the theorist.
Soon, the sample was ready.
In order to prevent the sample from being destroyed, an edge-to-edge assembly method was used. Brother Qian used a layer of separator to completely cover the LiFePO4 material in the glove box and carefully left a 2mm distance between the free ends of the positive and negative poles.
This step was crucial, as it was related to the safety of the experiment.
Brother Qian took out the sample from the glove box, closed all the valves, and let out a sigh of relief.
"Done."
Lu Zhou looked at the sample in Brother Qian's hand and asked, "Is this a battery?"
"A simple and unsafe lithium-ion battery," said Brother Qian concisely.
Lu Zhou was nervous, "Will it explode?"
Brother Qian shook his head, "It won't explode, but if it's not done properly, it might cause a fire."
Also, it would be a fire on a digital microscope.
It would be a small matter if the sample was burned, but if the digital microscope lens was burned, then it would be a big problem.
Lu Zhou guessed that this was one of the reasons why Brother Qian did not let a novice experiment like him.
After connecting the sample to the BK-6808 rechargeable battery tester and placing it on the digital microscope, Brother Qian set a few parameters in front of the computer while repeating the steps on the paper in a low voice, "Collect images once every 2 minutes. Data collection frequency is 1 Hz. First charge the battery for 400 minutes, then discharge to the cut-off voltage … Okay."
All that was left was a long wait.
Lu Zhou looked at the same instrument and could not help but ask, "Do you guys have to wait this long for battery material experiments?"
Four hundred minutes. That was almost seven hours.
Brother Qian pushed his glasses and said, "Seven hours is the basic operation. Sometimes we have to wait a few days to see the results. Usually, someone will stay in the laboratory, and Liu Bo and I will take turns."
"That's right," said Liu Bo with a smile, "I watched more than 40 dramas last year. I watched them while I was on duty in the laboratory. Do you want me to recommend some to you?"
Lu Zhou, "That's not necessary."
Even if he recommended it, he would not have time to watch it.
After all the necessary operations were done, Brother Qian taught Lu Zhou some simple ways to deal with unexpected situations.
For example, seeing the sample smoke, smelling something wrong, how to clean up the damaged sample, how to protect the instrument, and most importantly, how to protect oneself.
No matter how expensive the instrument was, it was not as important as the person.
Of course, this experiment wasn't that dangerous. Therefore, Brother Qian was relieved to give the key to Lu Zhou.
Brother Qian and Liu Bo still had some things to do, so they could not stay here forever. Lu Zhou did not want to bother Brother Qian. After all, this experiment had already taken up a lot of their time.
Lu Zhou took out the quantum chromodynamics book and sat next to the digital microscope. He studied theoretical physics while glancing at the digital microscope from time to time.
Later on, he found out that he did not need to be so careful at all. The sample had been under the microscope for a long time, but it did not look any different.
It could be seen that Brother Qian's experiment skills were quite reliable.
Lu Zhou stayed in the laboratory from ten o 'clock in the morning until six o' clock in the evening. During this time, Lu Zhou also ordered takeout and ate lunch.
Finally, the set time was up, and the charging and discharging were finished. Lu Zhou followed Brother Qian's instructions and waited for 10 minutes before he cut off the power.
Almost as soon as he finished the finishing touches, he heard footsteps coming from outside the laboratory. Senior Brother Liu, who had just finished his dinner in the cafeteria, arrived at the laboratory almost on time.
"Done?" Brother Liu looked at the sample and skillfully operated the computer. He clicked the print button and said, "Then let's collect the data."
The printer began to buzz.
Soon after, Lu Zhou got what he wanted.
A set of pictures of the growth of lithium dendrites under microscopic conditions, as well as graphs such as the cyclic voltage curve required by the system.
While collecting the data, Brother Liu spoke in a chatty tone.
"… Lithium is the most ideal anode material, but it is also the most difficult to service. When charging, the lithium ions that return to the negative electrode will never return to a flat lithium metal layer as you wish. Instead, they will form a beautiful and deadly tree branch. "
Lu Zhou waited for the printer to finish printing the diagram before he asked, "Deadly?"
"Yes, once this kind of dendrite is formed, it will continue to grow uncontrollably with continuous charging. Eventually, it will be like a fork, piercing the diaphragm and touching the positive electrode."
Speaking up to this point, Brother Liu paused for a moment and said in a joking tone, "Imagine if you connect a wire to the positive and negative poles of a battery, what will happen? That's right, a short circuit. And organic electrolytes are flammable. Have you heard of the Moli company? "
"No … Why?"
Brother Liu shrugged and handed the printed A4 paper to Lu Zhou. He said, "Their product almost made history, but because they used lithium as the negative electrode, there was a major safety accident. As a result, the NTT mobile phone was recalled, and the company went bankrupt and was acquired. In contrast, Sony was very smart. They directly used graphite as the negative electrode and introduced lithium-ion batteries, which quickly occupied the market. "
Lu Zhou couldn't help but ask, "Did they not do safety tests?"
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