[1] THE SCHOLAR ADVANCED TECHNOLOGY SYSTEM (END)

[1] THE SCHOLAR ADVANCED TECHNOLOGY SYSTEM (END)
Chapter 153: The Beautiful And Deadly Tree

Translator: Translated Henyee Editor: Translated Henyee


Lu Zhou replied, "Let me do it."


The system does not specify who should conduct the experiment, only that it must collect data. However, for the purpose of studying, Lu Zhou decided to do it himself.


After all, he must have the experience to become a legendary high-tech master.


When Lu Zhou wore a white coat, he felt like a little scientist. He then took a deep breath before grabbing the sample box containing the experimental ingredients.


However, his hand was pushed away by Brother Qian.


"Let me do it, just look at it."


Brother Qian took the initiative to experiment while Lu Zhou watched from the side.


Lu Zhou looked at Liu Bo who just shrugged.


"Don't remember, he's just like this. The equipment here is like his wife. It's more important than his life ... Just watch him do it. ”


Brother Qian then said, “Doing experiments is not like math, you can't make mistakes. Of course, I'm afraid you'll damage the equipment ... Show me your experiment design. "


Lu Zhou took out an A4 paper and said, "It's here."


The experimental steps and data required by the system are written there.


Brother Qian the brother took out an A4 paper and nodded as he said, "The design is quite professional."


Emm ...


It is designed by the system.


Lu Zhou said nothing.


...


The testing path is simple. They should start with the battery and observe the phenomenon.


95.7% graphite is used as a negative electrode material, and the binders are sodium carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR). The current collector is copper foil. The graphite coating has a thickness of 90 μm, the positive electrode active material uses LiFePO 4, and the current collector is aluminum foil.


As for the separator, the three-layer Celgard 2325 separator is used, and the thickness is about 25 ⁇ m.


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


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


Even high school students know about hydrofluoric acid.


Those things are dangerous. If it was in someone's hands, that hand would shatter beyond recognition.


Brother Qian did the experiment professionally.


Soon after, the sample is made.


To prevent the sample from being damaged, a side-to-side assembly method is used. Brother Qian completely covered the LiFePO4 material with a separating layer, and carefully left the free end of the positive and negative electrodes at a distance of 2 mm.


This step is very important.


Brother Qian took the sample and let out a long sigh.


"Done."


When Lu Zhou saw the sample in Brother Qian's hand, he asked, "This is the battery?"


Brother Qian the brother replied briefly, "Lithium-ion batteries are simple and unsafe."


Lu Zhou asked nervously, "Will it explode?"


Brother Qian shook his head, "It won't explode, but it might burn."


The fire will cause major problems.


Lu Zhou guessed that this was one of the reasons why Brother Qian did not let him touch the equipment.


The sample is connected to a rechargeable BK-6808 battery tester and then placed on a digital microscope. Brother Qian set some parameters to the computer and said, “The data collection frequency is 1 Hz, and the battery is released to the cut-off voltage. Wait until charged for 400 minutes ... "


Now, all they have to do is wait.


Lu Zhou looked at the instrument and asked, "Do we have to wait that long?"


400 Minutes, almost seven hours.


Brother Qian pushed his glasses and said, “7 hours is a basic operation. Sometimes it takes days to see results. Usually one person will live in a lab. I would usually take turns with Liu Bo. "


Liu Bo replied, “That's right, last year I watched over 40 TV shows while waiting in the lab. Would you like me to recommend you some? "


Lu Zhou, "There ... No need for that."


He had no time to watch TV.


After performing the necessary steps, Brother Qian briefly taught Lu Zhou about what to do in an emergency.


For example, what to do when a sample is smoking or smells strange, how to clean a damaged sample, and most importantly how to protect itself.


No matter how expensive the equipment was, it was not as valuable as his own life.


Of course, the experiment was harmless, so Brother Qian was sure to give Lu Zhou the keys.


He still had some things to do with Liu Bo, so they could not stay here.


Lu Zhou sat next to a digital microscope and took out a book on quantum physics. He would study quantum physics and occasionally look at digital microscopes.


Later, he knew that he did not need to be too careful. The sample under the microscope did not change at all.


It seemed that Brother Qian's experimental skills were quite reliable.


Lu Zhou stayed in the lab all day, and he even called for a delivery for lunch.


Finally, the time is up. The exit time is over. Lu Zhou waited for 10 minutes and kept the circuit open before he cut off the power.


He was almost done with the experiment when he suddenly heard footsteps outside the lab. Liu Bo had just eaten dinner in the cafeteria before returning to the lab.


When Liu Bo looked at the sample, he asked, "Done?"


He then skillfully operated the computer and said, "Then, let's gather the data."


The printer started humming.


Soon after, Lu Zhou received what he wanted.


A set of images showing the growth of lithium dendrites under microscopic conditions as well as graphs such as the cyclic voltage curve that the system must collect.


Liu Bo started chatting with him.


"... Lithium is the most ideal anode material, but also the hardest to charge. When charging, lithium ions that return to the negative pole will never turn into a flat lithium metal layer. Like a flower, it would form a beautiful and deadly tree. ”


Lu Zhou looked at the printer and asked, "Is this fatal?"


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


Liu Bo paused for a moment before he said in a joking tone, "Imagine if you connect the positive and negative poles of the battery, it will short circuit. Have you heard of the Moli Company? ”


"What's the matter?"


Liu Bo shrugged and handed the printed A4 paper to Lu Zhou as he said, "Their product almost created history, but due to the use of lithium as a negative electrode, a major accident occurred. NTT's phone is pulled back. Eventually, the company went bankrupt and was acquired. Sony is very smart. They used direct graphite as a negative electrode, and the introduction of lithium-ion batteries quickly took over the market. "


Lu Zhou couldn't help but ask, "Did they not do a security test?"


Liu Bo sighed and said, “Yes, everyone is asking that. But things aren't that simple. Maybe they didn't find any problems at all? Or maybe they think they found the perfect solution? Who knows?"